From patchwork Wed Jan 8 02:10:46 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Masami Hiramatsu (Google)" X-Patchwork-Id: 13929986 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 353E917E900; Wed, 8 Jan 2025 02:10:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736302252; cv=none; b=Fxb35HRi0xanVHcjMyt3Jsxu8Vt1iNF1CU4ZBsQaalsgAtfi5N45GhN0vGMziq0DDBajQlnN9A1cFupxh/ia1bMOv4Gh7N+SxwmUawSY050Hu/Az2LQny2I/dmBk4B68LtWq+r06cxBYCmkt0SCMmp7wZt5kPnwb07Qr8X1TY08= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736302252; c=relaxed/simple; bh=6QyVNa11BsehG9ROF+5/Jw9ETQ4uZvxVJBFzAmC3XNw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Z6nGz2VG9Hu6nNeBQtbprr/CcS6jh5rfmiu0p+rFN3z8wT5EO/t7x9YKY1HZ3Hc+X8DDrBkZxVw4xEfcP4+QQDrLq6Zbl9iO13GuvdVIrgRWC+Uv9iAIf+lGAKwuRMA8raIOmpoB2uNWcteHrkSvXFg9cWXiCHuyBc/9n/lmEA8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Ah+VR8Ow; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Ah+VR8Ow" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3DF20C4CED6; Wed, 8 Jan 2025 02:10:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1736302251; bh=6QyVNa11BsehG9ROF+5/Jw9ETQ4uZvxVJBFzAmC3XNw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Ah+VR8Ow1LQDNZa7TBu5x4eiel4tdPSnJTMvMzf+RrJYwUSDUh6FcpnmBdmgwKokF Ca7vxBcP9gtxqyDFxiH2f77fRJm8uGcthKwrg9EtQ3D3sONwZbzJyZ5JSHVsQTDS5k oz+BPoHTAwxgrGPmyPvSkU4pLiwnrPhW04QCM5N+HTPZCYLwrf1KP938uT2I7KXTcP 5d7Fa7p2hn+PLo/4HSnnkW+EIqmxd3KWI7Ipawr8FXPU0yPsrXf6aZXDt3gaJW1nfh 9taKwlYUA5PCgPJ9vuujmEP+PtpDJvY2ZQOQ6aEEkfd+XUSuDOgQRBOifY5dDrSSVE x5bc7GGTxSqJw== From: "Masami Hiramatsu (Google)" To: Steven Rostedt , Peter Zijlstra Cc: Anil S Keshavamurthy , Masami Hiramatsu , "David S . Miller" , Mathieu Desnoyers , Oleg Nesterov , Tzvetomir Stoyanov , Naveen N Rao , Josh Poimboeuf , Jason Baron , Ard Biesheuvel , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: [PATCH v5 1/5] tracing/kprobes: Fix to free objects when failed to copy a symbol Date: Wed, 8 Jan 2025 11:10:46 +0900 Message-ID: <173630224589.1453474.3336291076637629730.stgit@devnote2> X-Mailer: git-send-email 2.43.0 In-Reply-To: <173630223453.1453474.6442447279377996686.stgit@devnote2> References: <173630223453.1453474.6442447279377996686.stgit@devnote2> User-Agent: StGit/0.19 Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Masami Hiramatsu (Google) In __trace_kprobe_create(), if something fails it must goto error block to free objects. But when strdup() a symbol, it returns without that. Fix it to goto the error block to free objects correctly. Fixes: 6212dd29683e ("tracing/kprobes: Use dyn_event framework for kprobe events") Signed-off-by: Masami Hiramatsu (Google) Reviewed-by: Steven Rostedt (Google) --- kernel/trace/trace_kprobe.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index 263fac44d3ca..fb9d4dffa66e 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -940,8 +940,10 @@ static int __trace_kprobe_create(int argc, const char *argv[]) } /* a symbol specified */ symbol = kstrdup(argv[1], GFP_KERNEL); - if (!symbol) - return -ENOMEM; + if (!symbol) { + ret = -ENOMEM; + goto error; + } tmp = strchr(symbol, '%'); if (tmp) { From patchwork Wed Jan 8 02:10:57 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Masami Hiramatsu (Google)" X-Patchwork-Id: 13929987 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D0769156C71; Wed, 8 Jan 2025 02:11:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736302262; cv=none; b=U49Xd9gdWsF2KwfwSJe29jH83kJVFbnM9MCn5NPZoexFKySlcZOyL7md2aHwCReFg3U3K5WWTBk62rGXAbUpqCJG+nLflc/E/UHkz0pEvLtBP2tC6Xjk6R32PAU6BXj6EWimVaLKBJ+PrTRfEK9e2MvXXfwERzkAfeIjBziCmK4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736302262; c=relaxed/simple; bh=OIyk4lt7u6YQUvsVvH0+O4JS0/TGuaSftK095ruVNjQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=n50ONXa4k2Uo61Gt9sl2bGz+6ADNqJi2czpKRbEToh7sfiNMGlWO/+LvlWZHxnzIJlCRX3ytat+sHptaQgFjoDOrE1grwTOV0tB3xtbD56Me4OiekG/Ks3RrMaCsmDVjftcWQev8YhGi+nVmv23rCl7KXwRws6kkYP5FWakyyHg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=hGJinHhd; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="hGJinHhd" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 65644C4CEE0; Wed, 8 Jan 2025 02:10:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1736302262; bh=OIyk4lt7u6YQUvsVvH0+O4JS0/TGuaSftK095ruVNjQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hGJinHhdmDr9aLv3U7geJnxHKQodt9UQlAaeSMiiGpFy3TzP3FpkjL/ayx6+lNAjG jZgSTJD1i3Fkv+R8VBgd2slck+vSvbj62Qud/uZABP3OwUqcxy25asutnQcbxEhsbe eI0mU+itrhtcbb9Fm9oUHk9cRMA5z5nf0tB7x6oJ/jY7EzM5CNZBo/zFLtRY4hiotK /f1jjXgwq9uzIMHAX0soHQ0LUhuF9+JU+t6aFLD0FrHUOJqyK4OCV6ZWcfB9+nF6x9 j+I1tvzui8W3IBrCc3HE7k+hwCDTftG322j/34tmEmK5ND+Fic3I2qMiwIBpY8lNwL cACpCbQLQLtlw== From: "Masami Hiramatsu (Google)" To: Steven Rostedt , Peter Zijlstra Cc: Anil S Keshavamurthy , Masami Hiramatsu , "David S . Miller" , Mathieu Desnoyers , Oleg Nesterov , Tzvetomir Stoyanov , Naveen N Rao , Josh Poimboeuf , Jason Baron , Ard Biesheuvel , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: [PATCH v5 2/5] tracing: Use __free() in trace_probe for cleanup Date: Wed, 8 Jan 2025 11:10:57 +0900 Message-ID: <173630225708.1453474.16752527154293973755.stgit@devnote2> X-Mailer: git-send-email 2.43.0 In-Reply-To: <173630223453.1453474.6442447279377996686.stgit@devnote2> References: <173630223453.1453474.6442447279377996686.stgit@devnote2> User-Agent: StGit/0.19 Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Masami Hiramatsu (Google) Use __free() in trace_probe to cleanup some gotos. Signed-off-by: Masami Hiramatsu (Google) Reviewed-by: Steven Rostedt (Google) --- Changes in v5: - Fix to remove kfree() in for loop. Since I confirmed __free(kfree) is called in each iteration. --- kernel/trace/trace_probe.c | 51 +++++++++++++++----------------------------- 1 file changed, 17 insertions(+), 34 deletions(-) diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c index 16a5e368e7b7..8f58ee1e8858 100644 --- a/kernel/trace/trace_probe.c +++ b/kernel/trace/trace_probe.c @@ -1409,7 +1409,7 @@ static int traceprobe_parse_probe_arg_body(const char *argv, ssize_t *size, struct traceprobe_parse_context *ctx) { struct fetch_insn *code, *tmp = NULL; - char *type, *arg; + char *type, *arg __free(kfree) = NULL; int ret, len; len = strlen(argv); @@ -1426,22 +1426,16 @@ static int traceprobe_parse_probe_arg_body(const char *argv, ssize_t *size, return -ENOMEM; parg->comm = kstrdup(arg, GFP_KERNEL); - if (!parg->comm) { - ret = -ENOMEM; - goto out; - } + if (!parg->comm) + return -ENOMEM; type = parse_probe_arg_type(arg, parg, ctx); - if (IS_ERR(type)) { - ret = PTR_ERR(type); - goto out; - } + if (IS_ERR(type)) + return PTR_ERR(type); code = tmp = kcalloc(FETCH_INSN_MAX, sizeof(*code), GFP_KERNEL); - if (!code) { - ret = -ENOMEM; - goto out; - } + if (!code) + return -ENOMEM; code[FETCH_INSN_MAX - 1].op = FETCH_OP_END; ctx->last_type = NULL; @@ -1497,8 +1491,6 @@ static int traceprobe_parse_probe_arg_body(const char *argv, ssize_t *size, kfree(code->data); } kfree(tmp); -out: - kfree(arg); return ret; } @@ -1668,7 +1660,7 @@ const char **traceprobe_expand_meta_args(int argc, const char *argv[], { const struct btf_param *params = NULL; int i, j, n, used, ret, args_idx = -1; - const char **new_argv = NULL; + const char **new_argv __free(kfree) = NULL; ret = argv_has_var_arg(argc, argv, &args_idx, ctx); if (ret < 0) @@ -1707,7 +1699,7 @@ const char **traceprobe_expand_meta_args(int argc, const char *argv[], ret = sprint_nth_btf_arg(n, "", buf + used, bufsize - used, ctx); if (ret < 0) - goto error; + return ERR_PTR(ret); new_argv[j++] = buf + used; used += ret + 1; @@ -1721,25 +1713,20 @@ const char **traceprobe_expand_meta_args(int argc, const char *argv[], n = simple_strtoul(argv[i] + 4, &type, 10); if (type && !(*type == ':' || *type == '\0')) { trace_probe_log_err(0, BAD_VAR); - ret = -ENOENT; - goto error; + return ERR_PTR(-ENOENT); } /* Note: $argN starts from $arg1 */ ret = sprint_nth_btf_arg(n - 1, type, buf + used, bufsize - used, ctx); if (ret < 0) - goto error; + return ERR_PTR(ret); new_argv[j++] = buf + used; used += ret + 1; } else new_argv[j++] = argv[i]; } - return new_argv; - -error: - kfree(new_argv); - return ERR_PTR(ret); + return_ptr(new_argv); } /* @buf: *buf must be equal to NULL. Caller must to free *buf */ @@ -1747,14 +1734,14 @@ int traceprobe_expand_dentry_args(int argc, const char *argv[], char **buf) { int i, used, ret; const int bufsize = MAX_DENTRY_ARGS_LEN; - char *tmpbuf = NULL; + char *tmpbuf __free(kfree) = NULL; if (*buf) return -EINVAL; used = 0; for (i = 0; i < argc; i++) { - char *tmp; + char *tmp __free(kfree) = NULL; char *equal; size_t arg_len; @@ -1769,7 +1756,7 @@ int traceprobe_expand_dentry_args(int argc, const char *argv[], char **buf) tmp = kstrdup(argv[i], GFP_KERNEL); if (!tmp) - goto nomem; + return -ENOMEM; equal = strchr(tmp, '='); if (equal) @@ -1790,18 +1777,14 @@ int traceprobe_expand_dentry_args(int argc, const char *argv[], char **buf) offsetof(struct file, f_path.dentry), equal ? equal + 1 : tmp); - kfree(tmp); if (ret >= bufsize - used) - goto nomem; + return -ENOMEM; argv[i] = tmpbuf + used; used += ret + 1; } - *buf = tmpbuf; + *buf = no_free_ptr(tmpbuf); return 0; -nomem: - kfree(tmpbuf); - return -ENOMEM; } void traceprobe_finish_parse(struct traceprobe_parse_context *ctx) From patchwork Wed Jan 8 02:11:07 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Masami Hiramatsu (Google)" X-Patchwork-Id: 13929988 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 968661A238F; Wed, 8 Jan 2025 02:11:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736302273; cv=none; b=evKgHaropMXZ4u++9uiQ3/DoAC2kJbC3OJ1OQ6gQXykvr13y/uRnj3enPKlAo0SV9jeW/NL8lYKXXKGKfiW5gWezjkcC1ZHiIeTne3XpPKKQZEHxHPDeu8KqGjV9EDs38qfqISjDxtyqGkXL6QjuZMrF4+Ra1qegQ9GLLZKn1DM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736302273; c=relaxed/simple; bh=kxJngtFykS1ifJC7zJK0EVWjdRdHTT/wqMbrfB+dqQg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=sqn45457b/6Fa0Dc+Cl1Am9vNJuWieuo2bJVzB1GMoEfWnw2p6arh+l38pIiCtXYmi0l1yocDzN70RyxMj4v4ZZTA9jI7EFKLBBf6Fvb4y5mn8qxZ7gUt+FR0mWSKJN9sPyEJDECh+kHfPGm0fhAroIrEZnwDPrblZoWP2kFuuM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=meWEADUH; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="meWEADUH" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 293D2C4CED6; Wed, 8 Jan 2025 02:11:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1736302273; bh=kxJngtFykS1ifJC7zJK0EVWjdRdHTT/wqMbrfB+dqQg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=meWEADUHlzAVH+L9sjxMm6fkzBjc428H/JFYzbIs4ZZTQD1D6cvvqBkAD/PorU2nc XH6FHZyrfIh5eZBRRB+jsEZtFyUL4VN8dXoRikpyYFWcxdyp6qQ9NzgH3Slx8iQQN9 CoprvHHDoqbMmm6HNDpnctx67IazQ9CzTC/T/jq0cVHkv4Ibs/w/cKtH6Yx3r1q/F+ 6oqoB8onADNWoDV0aFHKtpffeZbXDp3yKeSagKuq38Qgk/ghG0WMHu1oTbb/ej5n+U MWt23d/FcHMYkNEH+7sH7zNc4ilSv4fvFM3/yXN+ZyoNuge7P7aqxEvvBbe5E5omDC mT/QdnUB2vpdA== From: "Masami Hiramatsu (Google)" To: Steven Rostedt , Peter Zijlstra Cc: Anil S Keshavamurthy , Masami Hiramatsu , "David S . Miller" , Mathieu Desnoyers , Oleg Nesterov , Tzvetomir Stoyanov , Naveen N Rao , Josh Poimboeuf , Jason Baron , Ard Biesheuvel , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: [PATCH v5 3/5] tracing: Use __free() for kprobe events to cleanup Date: Wed, 8 Jan 2025 11:11:07 +0900 Message-ID: <173630226782.1453474.10077691519522198018.stgit@devnote2> X-Mailer: git-send-email 2.43.0 In-Reply-To: <173630223453.1453474.6442447279377996686.stgit@devnote2> References: <173630223453.1453474.6442447279377996686.stgit@devnote2> User-Agent: StGit/0.19 Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Masami Hiramatsu (Google) Use __free() in trace_kprobe.c to cleanup code. Signed-off-by: Masami Hiramatsu (Google) Reviewed-by: Steven Rostedt (Google) --- Changes in v4: - Use no_free_ptr(tk)->tp instead of assiging NULL to tk. Changes in v3: - Rename to __free(free_trace_kprobe) to clarify what function will be called. - Add !IS_ERR_OR_NULL() check because alloc_trace_kprobe() returns an error code. - Prevent freeing 'tk' in create_local_trace_kprobe() when succeeded to register. Changes in v2: - Instead of using no_free_ptr(), just assign NULL to the registered pointer. --- kernel/trace/trace_kprobe.c | 62 ++++++++++++++++++++----------------------- 1 file changed, 29 insertions(+), 33 deletions(-) diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index fb9d4dffa66e..2d86ef88d36a 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -8,6 +8,7 @@ #define pr_fmt(fmt) "trace_kprobe: " fmt #include +#include #include #include #include @@ -257,6 +258,9 @@ static void free_trace_kprobe(struct trace_kprobe *tk) } } +DEFINE_FREE(free_trace_kprobe, struct trace_kprobe *, + if (!IS_ERR_OR_NULL(_T)) free_trace_kprobe(_T)) + /* * Allocate new trace_probe and initialize it (including kprobes). */ @@ -268,7 +272,7 @@ static struct trace_kprobe *alloc_trace_kprobe(const char *group, int maxactive, int nargs, bool is_return) { - struct trace_kprobe *tk; + struct trace_kprobe *tk __free(free_trace_kprobe) = NULL; int ret = -ENOMEM; tk = kzalloc(struct_size(tk, tp.args, nargs), GFP_KERNEL); @@ -277,12 +281,12 @@ static struct trace_kprobe *alloc_trace_kprobe(const char *group, tk->nhit = alloc_percpu(unsigned long); if (!tk->nhit) - goto error; + return ERR_PTR(ret); if (symbol) { tk->symbol = kstrdup(symbol, GFP_KERNEL); if (!tk->symbol) - goto error; + return ERR_PTR(ret); tk->rp.kp.symbol_name = tk->symbol; tk->rp.kp.offset = offs; } else @@ -299,13 +303,10 @@ static struct trace_kprobe *alloc_trace_kprobe(const char *group, ret = trace_probe_init(&tk->tp, event, group, false, nargs); if (ret < 0) - goto error; + return ERR_PTR(ret); dyn_event_init(&tk->devent, &trace_kprobe_ops); - return tk; -error: - free_trace_kprobe(tk); - return ERR_PTR(ret); + return_ptr(tk); } static struct trace_kprobe *find_trace_kprobe(const char *event, @@ -866,11 +867,12 @@ static int __trace_kprobe_create(int argc, const char *argv[]) * Type of args: * FETCHARG:TYPE : use TYPE instead of unsigned long. */ - struct trace_kprobe *tk = NULL; + struct trace_kprobe *tk __free(free_trace_kprobe) = NULL; int i, len, new_argc = 0, ret = 0; bool is_return = false; - char *symbol = NULL, *tmp = NULL; - const char **new_argv = NULL; + char *symbol __free(kfree) = NULL; + char *tmp = NULL; + const char **new_argv __free(kfree) = NULL; const char *event = NULL, *group = KPROBE_EVENT_SYSTEM; enum probe_print_type ptype; int maxactive = 0; @@ -879,7 +881,7 @@ static int __trace_kprobe_create(int argc, const char *argv[]) char buf[MAX_EVENT_NAME_LEN]; char gbuf[MAX_EVENT_NAME_LEN]; char abuf[MAX_BTF_ARGS_LEN]; - char *dbuf = NULL; + char *dbuf __free(kfree) = NULL; struct traceprobe_parse_context ctx = { .flags = TPARG_FL_KERNEL }; switch (argv[0][0]) { @@ -936,13 +938,13 @@ static int __trace_kprobe_create(int argc, const char *argv[]) /* Check whether uprobe event specified */ if (strchr(argv[1], '/') && strchr(argv[1], ':')) { ret = -ECANCELED; - goto error; + goto out; } /* a symbol specified */ symbol = kstrdup(argv[1], GFP_KERNEL); if (!symbol) { ret = -ENOMEM; - goto error; + goto out; } tmp = strchr(symbol, '%'); @@ -1040,7 +1042,7 @@ static int __trace_kprobe_create(int argc, const char *argv[]) ctx.offset = 0; ret = traceprobe_parse_probe_arg(&tk->tp, i, argv[i], &ctx); if (ret) - goto error; /* This can be -ENOMEM */ + goto out; /* This can be -ENOMEM */ } /* entry handler for kretprobe */ if (is_return && tk->tp.entry_arg) { @@ -1051,7 +1053,7 @@ static int __trace_kprobe_create(int argc, const char *argv[]) ptype = is_return ? PROBE_PRINT_RETURN : PROBE_PRINT_NORMAL; ret = traceprobe_set_print_fmt(&tk->tp, ptype); if (ret < 0) - goto error; + goto out; ret = register_trace_kprobe(tk); if (ret) { @@ -1062,21 +1064,20 @@ static int __trace_kprobe_create(int argc, const char *argv[]) trace_probe_log_err(0, BAD_PROBE_ADDR); else if (ret != -ENOMEM && ret != -EEXIST) trace_probe_log_err(0, FAIL_REG_PROBE); - goto error; - } + } else + /* + * Here, 'tk' has been registered to the list successfully, + * so we don't need to free it. + */ + tk = NULL; out: traceprobe_finish_parse(&ctx); trace_probe_log_clear(); - kfree(new_argv); - kfree(symbol); - kfree(dbuf); return ret; parse_error: ret = -EINVAL; -error: - free_trace_kprobe(tk); goto out; } @@ -1898,7 +1899,7 @@ create_local_trace_kprobe(char *func, void *addr, unsigned long offs, bool is_return) { enum probe_print_type ptype; - struct trace_kprobe *tk; + struct trace_kprobe *tk __free(free_trace_kprobe) = NULL; int ret; char *event; @@ -1929,19 +1930,14 @@ create_local_trace_kprobe(char *func, void *addr, unsigned long offs, ptype = trace_kprobe_is_return(tk) ? PROBE_PRINT_RETURN : PROBE_PRINT_NORMAL; - if (traceprobe_set_print_fmt(&tk->tp, ptype) < 0) { - ret = -ENOMEM; - goto error; - } + if (traceprobe_set_print_fmt(&tk->tp, ptype) < 0) + return ERR_PTR(-ENOMEM); ret = __register_trace_kprobe(tk); if (ret < 0) - goto error; + return ERR_PTR(ret); - return trace_probe_event_call(&tk->tp); -error: - free_trace_kprobe(tk); - return ERR_PTR(ret); + return trace_probe_event_call(&(no_free_ptr(tk)->tp)); } void destroy_local_trace_kprobe(struct trace_event_call *event_call) From patchwork Wed Jan 8 02:11:18 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Masami Hiramatsu (Google)" X-Patchwork-Id: 13929989 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1413419F10A; Wed, 8 Jan 2025 02:11:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736302285; cv=none; b=Xdng7d5aGk9R8gr4/FkPt6LSok2ewUUK1cmRxePtmMko5XsRPYCTIgsqxRYBEw7ADfUF2RQxyIGz/5pcyNaUPkOnr7r2nMLzFjv4XcQZEd6Mq+IiX1LBTcSn/xMr8HVFo7j11dX5HDlqSxyV1L52z30ZyVXbIGTtYOajQJIzzRM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736302285; c=relaxed/simple; bh=GOG0lTBqQwGjc2pjGka7NWOCb2G5qjzI6woR87sLUmc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=VJE4QaPXq9JEIPY2rGQkXmDECxzfxZIL17ssTlFmoK6T8nVT3qMRjw4vu3FISwITIT87JgLT8GL055Lxh698Er1ZfZYQZTHTmZpf4j2FhaoI9RpUclkViL06+sU0rTI5kyO7AHK8CyUXcfYl6AWWOz8mrPNqnjU30u5dKiYuLxE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=gBxwtk7K; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="gBxwtk7K" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C6F13C4CED6; Wed, 8 Jan 2025 02:11:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1736302284; bh=GOG0lTBqQwGjc2pjGka7NWOCb2G5qjzI6woR87sLUmc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gBxwtk7KM6AXYY5CRL8DeN9B19CRkcuAmpJHEozm56nxju0I1ul+B7ral/4Sln+HV 8CVGZej3u74P00bnLsAmF3Oam0pI6nXqxF4QbHqnzP5/tO6Zrb6JR5rFg0HdOBolui hTkcuw3lzjVRaX8WmqzLDcD5cDBMYlHRv8bgUHns/LhvMjKI1krQQ5aRryFyKc3TTo vOVCddUdLg+3LK9zvZSG7Yf3eGhSfVKh8dwahsF/M5bapGOadEmajfO2HF3MxRWYne JHJdr4CFbTqfi0vSfOSySwhji4RuZtovqdoUMKyGCbN1AeE8uvxMI+iFhdpC2DJPu0 r2Dg+kBWHtPsg== From: "Masami Hiramatsu (Google)" To: Steven Rostedt , Peter Zijlstra Cc: Anil S Keshavamurthy , Masami Hiramatsu , "David S . Miller" , Mathieu Desnoyers , Oleg Nesterov , Tzvetomir Stoyanov , Naveen N Rao , Josh Poimboeuf , Jason Baron , Ard Biesheuvel , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: [PATCH v5 4/5] tracing/kprobes: Simplify __trace_kprobe_create() by removing gotos Date: Wed, 8 Jan 2025 11:11:18 +0900 Message-ID: <173630227845.1453474.6513848165385480817.stgit@devnote2> X-Mailer: git-send-email 2.43.0 In-Reply-To: <173630223453.1453474.6442447279377996686.stgit@devnote2> References: <173630223453.1453474.6442447279377996686.stgit@devnote2> User-Agent: StGit/0.19 Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Masami Hiramatsu (Google) Simplify __trace_kprobe_create() by removing gotos. Signed-off-by: Masami Hiramatsu (Google) --- kernel/trace/trace_kprobe.c | 82 ++++++++++++++++++++++--------------------- 1 file changed, 41 insertions(+), 41 deletions(-) diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index 2d86ef88d36a..27abe43d8903 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -841,7 +841,8 @@ static int validate_probe_symbol(char *symbol) static int trace_kprobe_entry_handler(struct kretprobe_instance *ri, struct pt_regs *regs); -static int __trace_kprobe_create(int argc, const char *argv[]) +static int ___trace_kprobe_create(int argc, const char *argv[], + struct traceprobe_parse_context *ctx) { /* * Argument syntax: @@ -882,7 +883,6 @@ static int __trace_kprobe_create(int argc, const char *argv[]) char gbuf[MAX_EVENT_NAME_LEN]; char abuf[MAX_BTF_ARGS_LEN]; char *dbuf __free(kfree) = NULL; - struct traceprobe_parse_context ctx = { .flags = TPARG_FL_KERNEL }; switch (argv[0][0]) { case 'r': @@ -896,8 +896,6 @@ static int __trace_kprobe_create(int argc, const char *argv[]) if (argc < 2) return -ECANCELED; - trace_probe_log_init("trace_kprobe", argc, argv); - event = strchr(&argv[0][1], ':'); if (event) event++; @@ -905,7 +903,7 @@ static int __trace_kprobe_create(int argc, const char *argv[]) if (isdigit(argv[0][1])) { if (!is_return) { trace_probe_log_err(1, BAD_MAXACT_TYPE); - goto parse_error; + return -EINVAL; } if (event) len = event - &argv[0][1] - 1; @@ -913,21 +911,21 @@ static int __trace_kprobe_create(int argc, const char *argv[]) len = strlen(&argv[0][1]); if (len > MAX_EVENT_NAME_LEN - 1) { trace_probe_log_err(1, BAD_MAXACT); - goto parse_error; + return -EINVAL; } memcpy(buf, &argv[0][1], len); buf[len] = '\0'; ret = kstrtouint(buf, 0, &maxactive); if (ret || !maxactive) { trace_probe_log_err(1, BAD_MAXACT); - goto parse_error; + return -EINVAL; } /* kretprobes instances are iterated over via a list. The * maximum should stay reasonable. */ if (maxactive > KRETPROBE_MAXACTIVE_MAX) { trace_probe_log_err(1, MAXACT_TOO_BIG); - goto parse_error; + return -EINVAL; } } @@ -936,16 +934,13 @@ static int __trace_kprobe_create(int argc, const char *argv[]) if (kstrtoul(argv[1], 0, (unsigned long *)&addr)) { trace_probe_log_set_index(1); /* Check whether uprobe event specified */ - if (strchr(argv[1], '/') && strchr(argv[1], ':')) { - ret = -ECANCELED; - goto out; - } + if (strchr(argv[1], '/') && strchr(argv[1], ':')) + return -ECANCELED; + /* a symbol specified */ symbol = kstrdup(argv[1], GFP_KERNEL); - if (!symbol) { - ret = -ENOMEM; - goto out; - } + if (!symbol) + return -ENOMEM; tmp = strchr(symbol, '%'); if (tmp) { @@ -954,7 +949,7 @@ static int __trace_kprobe_create(int argc, const char *argv[]) is_return = true; } else { trace_probe_log_err(tmp - symbol, BAD_ADDR_SUFFIX); - goto parse_error; + return -EINVAL; } } @@ -962,7 +957,7 @@ static int __trace_kprobe_create(int argc, const char *argv[]) ret = traceprobe_split_symbol_offset(symbol, &offset); if (ret || offset < 0 || offset > UINT_MAX) { trace_probe_log_err(0, BAD_PROBE_ADDR); - goto parse_error; + return -EINVAL; } ret = validate_probe_symbol(symbol); if (ret) { @@ -970,17 +965,17 @@ static int __trace_kprobe_create(int argc, const char *argv[]) trace_probe_log_err(0, NON_UNIQ_SYMBOL); else trace_probe_log_err(0, BAD_PROBE_ADDR); - goto parse_error; + return -EINVAL; } if (is_return) - ctx.flags |= TPARG_FL_RETURN; + ctx->flags |= TPARG_FL_RETURN; ret = kprobe_on_func_entry(NULL, symbol, offset); if (ret == 0 && !is_return) - ctx.flags |= TPARG_FL_FENTRY; + ctx->flags |= TPARG_FL_FENTRY; /* Defer the ENOENT case until register kprobe */ if (ret == -EINVAL && is_return) { trace_probe_log_err(0, BAD_RETPROBE); - goto parse_error; + return -EINVAL; } } @@ -989,7 +984,7 @@ static int __trace_kprobe_create(int argc, const char *argv[]) ret = traceprobe_parse_event_name(&event, &group, gbuf, event - argv[0]); if (ret) - goto parse_error; + return ret; } if (!event) { @@ -1005,26 +1000,24 @@ static int __trace_kprobe_create(int argc, const char *argv[]) } argc -= 2; argv += 2; - ctx.funcname = symbol; + ctx->funcname = symbol; new_argv = traceprobe_expand_meta_args(argc, argv, &new_argc, - abuf, MAX_BTF_ARGS_LEN, &ctx); + abuf, MAX_BTF_ARGS_LEN, ctx); if (IS_ERR(new_argv)) { ret = PTR_ERR(new_argv); new_argv = NULL; - goto out; + return ret; } if (new_argv) { argc = new_argc; argv = new_argv; } - if (argc > MAX_TRACE_ARGS) { - ret = -E2BIG; - goto out; - } + if (argc > MAX_TRACE_ARGS) + return -E2BIG; ret = traceprobe_expand_dentry_args(argc, argv, &dbuf); if (ret) - goto out; + return ret; /* setup a probe */ tk = alloc_trace_kprobe(group, event, addr, symbol, offset, maxactive, @@ -1033,16 +1026,16 @@ static int __trace_kprobe_create(int argc, const char *argv[]) ret = PTR_ERR(tk); /* This must return -ENOMEM, else there is a bug */ WARN_ON_ONCE(ret != -ENOMEM); - goto out; /* We know tk is not allocated */ + return ret; /* We know tk is not allocated */ } /* parse arguments */ for (i = 0; i < argc; i++) { trace_probe_log_set_index(i + 2); - ctx.offset = 0; - ret = traceprobe_parse_probe_arg(&tk->tp, i, argv[i], &ctx); + ctx->offset = 0; + ret = traceprobe_parse_probe_arg(&tk->tp, i, argv[i], ctx); if (ret) - goto out; /* This can be -ENOMEM */ + return ret; /* This can be -ENOMEM */ } /* entry handler for kretprobe */ if (is_return && tk->tp.entry_arg) { @@ -1053,7 +1046,7 @@ static int __trace_kprobe_create(int argc, const char *argv[]) ptype = is_return ? PROBE_PRINT_RETURN : PROBE_PRINT_NORMAL; ret = traceprobe_set_print_fmt(&tk->tp, ptype); if (ret < 0) - goto out; + return ret; ret = register_trace_kprobe(tk); if (ret) { @@ -1071,14 +1064,21 @@ static int __trace_kprobe_create(int argc, const char *argv[]) */ tk = NULL; -out: + return ret; +} + +static int __trace_kprobe_create(int argc, const char *argv[]) +{ + struct traceprobe_parse_context ctx = { .flags = TPARG_FL_KERNEL }; + int ret; + + trace_probe_log_init("trace_kprobe", argc, argv); + + ret = ___trace_kprobe_create(argc, argv, &ctx); + traceprobe_finish_parse(&ctx); trace_probe_log_clear(); return ret; - -parse_error: - ret = -EINVAL; - goto out; } static int trace_kprobe_create(const char *raw_command) From patchwork Wed Jan 8 02:11:30 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Masami Hiramatsu (Google)" X-Patchwork-Id: 13929990 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C1C711A265E; Wed, 8 Jan 2025 02:11:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736302295; cv=none; b=dtMI/eEe03fLpG8sHUm4wkB859JFgzU0zCEJ0hOSJP41LGkMmExNqDKLNYXzSge31y51fK85moz0oF0PXUAi6pjphKPtu9ZhBQfsml8nBANNd4sKVpL8eRZePXR45ttmEvPdrrLIVjuvLeREFtdZAjoWbGOE+g1MiRrj4gXzjEs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736302295; c=relaxed/simple; bh=cWfM7pDjpnXkX6rzKo3buzt3QtdFFTEv3P6Y91fHmqs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=dJih9zPX7xUdbejlnI3BoAVS2YdUxEm6XsiKHNEAIHsZTE0X3pwxy9HqjK8oGNfqK9u4DxNTN3ivbNLrgNCOGjimjdErT8W7LvT3PTnJToZeBVuSyY0DbWRGhK3or3P88d/URK8hFpN0uIU/n6jgBM5HhW5QidyK3YNBrOKNWP0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=F+nn+Zd4; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="F+nn+Zd4" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5E2D3C4CED6; Wed, 8 Jan 2025 02:11:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1736302295; bh=cWfM7pDjpnXkX6rzKo3buzt3QtdFFTEv3P6Y91fHmqs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=F+nn+Zd4r/Qo1kpbdhsyW+iqj+AxcD5J2EMvkHkUYiHiRqO5i5ffZRlZFNh2LsDcc 5dpjlSbJmnAvWrSI14wdJRIv/E4mX1T6C+3umgUTBhRhVeSO5vm5Mmzxxgtr9fBZFl cX80DWALzIbPqLm14Yz8VvvArW+eQ20tvbkg+dS/F1boF9IkYwGx45KqlMiSQEb6uJ IHlwFWzfFT43c+sP491rIgjtqNpLaTjOTuzD5K7pPA9wT7L+uTkOwRQ9zgyOe4hKB0 L0Actnwd0VtQ2A9FaXGjkITcWfiXJo9FO+z6o7zU0DQA705bR064ACWkibPvLAwXlX JjKhV4belkhqQ== From: "Masami Hiramatsu (Google)" To: Steven Rostedt , Peter Zijlstra Cc: Anil S Keshavamurthy , Masami Hiramatsu , "David S . Miller" , Mathieu Desnoyers , Oleg Nesterov , Tzvetomir Stoyanov , Naveen N Rao , Josh Poimboeuf , Jason Baron , Ard Biesheuvel , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: [PATCH v5 5/5] tracing: Adopt __free() and guard() for trace_fprobe.c Date: Wed, 8 Jan 2025 11:11:30 +0900 Message-ID: <173630229003.1453474.2286376301458030998.stgit@devnote2> X-Mailer: git-send-email 2.43.0 In-Reply-To: <173630223453.1453474.6442447279377996686.stgit@devnote2> References: <173630223453.1453474.6442447279377996686.stgit@devnote2> User-Agent: StGit/0.19 Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Masami Hiramatsu (Google) Adopt __free() and guard() for trace_fprobe.c to remove gotos. Signed-off-by: Masami Hiramatsu (Google) --- kernel/trace/trace_fprobe.c | 129 ++++++++++++++++++++----------------------- 1 file changed, 60 insertions(+), 69 deletions(-) diff --git a/kernel/trace/trace_fprobe.c b/kernel/trace/trace_fprobe.c index c62d1629cffe..6d339c426b5d 100644 --- a/kernel/trace/trace_fprobe.c +++ b/kernel/trace/trace_fprobe.c @@ -379,6 +379,9 @@ static void free_trace_fprobe(struct trace_fprobe *tf) } } +/* Since alloc_trace_fprobe() can return error, check the pointer is ERR too. */ +DEFINE_FREE(trace_fprobe, struct trace_fprobe *, if (!IS_ERR_OR_NULL(_T)) free_trace_fprobe(_T)) + /* * Allocate new trace_probe and initialize it (including fprobe). */ @@ -390,7 +393,7 @@ static struct trace_fprobe *alloc_trace_fprobe(const char *group, int maxactive, int nargs, bool is_return) { - struct trace_fprobe *tf; + struct trace_fprobe *tf __free(trace_fprobe) = NULL; int ret = -ENOMEM; tf = kzalloc(struct_size(tf, tp.args, nargs), GFP_KERNEL); @@ -399,7 +402,7 @@ static struct trace_fprobe *alloc_trace_fprobe(const char *group, tf->symbol = kstrdup(symbol, GFP_KERNEL); if (!tf->symbol) - goto error; + return ERR_PTR(-ENOMEM); if (is_return) tf->fp.exit_handler = fexit_dispatcher; @@ -412,13 +415,10 @@ static struct trace_fprobe *alloc_trace_fprobe(const char *group, ret = trace_probe_init(&tf->tp, event, group, false, nargs); if (ret < 0) - goto error; + return ERR_PTR(ret); dyn_event_init(&tf->devent, &trace_fprobe_ops); - return tf; -error: - free_trace_fprobe(tf); - return ERR_PTR(ret); + return_ptr(tf); } static struct trace_fprobe *find_trace_fprobe(const char *event, @@ -845,14 +845,12 @@ static int register_trace_fprobe(struct trace_fprobe *tf) struct trace_fprobe *old_tf; int ret; - mutex_lock(&event_mutex); + guard(mutex)(&event_mutex); old_tf = find_trace_fprobe(trace_probe_name(&tf->tp), trace_probe_group_name(&tf->tp)); - if (old_tf) { - ret = append_trace_fprobe(tf, old_tf); - goto end; - } + if (old_tf) + return append_trace_fprobe(tf, old_tf); /* Register new event */ ret = register_fprobe_event(tf); @@ -862,7 +860,7 @@ static int register_trace_fprobe(struct trace_fprobe *tf) trace_probe_log_err(0, EVENT_EXIST); } else pr_warn("Failed to register probe event(%d)\n", ret); - goto end; + return ret; } /* Register fprobe */ @@ -872,8 +870,6 @@ static int register_trace_fprobe(struct trace_fprobe *tf) else dyn_event_add(&tf->devent, trace_probe_event_call(&tf->tp)); -end: - mutex_unlock(&event_mutex); return ret; } @@ -1034,7 +1030,10 @@ static int parse_symbol_and_return(int argc, const char *argv[], return 0; } -static int __trace_fprobe_create(int argc, const char *argv[]) +DEFINE_FREE(module_put, struct module *, if (_T) module_put(_T)) + +static int ___trace_fprobe_create(int argc, const char *argv[], + struct traceprobe_parse_context *ctx) { /* * Argument syntax: @@ -1060,24 +1059,21 @@ static int __trace_fprobe_create(int argc, const char *argv[]) * Type of args: * FETCHARG:TYPE : use TYPE instead of unsigned long. */ - struct trace_fprobe *tf = NULL; + struct trace_fprobe *tf __free(trace_fprobe) = NULL; int i, len, new_argc = 0, ret = 0; bool is_return = false; - char *symbol = NULL; + char *symbol __free(kfree) = NULL; const char *event = NULL, *group = FPROBE_EVENT_SYSTEM; - const char **new_argv = NULL; + const char **new_argv __free(kfree) = NULL; int maxactive = 0; char buf[MAX_EVENT_NAME_LEN]; char gbuf[MAX_EVENT_NAME_LEN]; char sbuf[KSYM_NAME_LEN]; char abuf[MAX_BTF_ARGS_LEN]; - char *dbuf = NULL; + char *dbuf __free(kfree) = NULL; bool is_tracepoint = false; - struct module *tp_mod = NULL; + struct module *tp_mod __free(module_put) = NULL; struct tracepoint *tpoint = NULL; - struct traceprobe_parse_context ctx = { - .flags = TPARG_FL_KERNEL | TPARG_FL_FPROBE, - }; if ((argv[0][0] != 'f' && argv[0][0] != 't') || argc < 2) return -ECANCELED; @@ -1087,8 +1083,6 @@ static int __trace_fprobe_create(int argc, const char *argv[]) group = TRACEPOINT_EVENT_SYSTEM; } - trace_probe_log_init("trace_fprobe", argc, argv); - event = strchr(&argv[0][1], ':'); if (event) event++; @@ -1100,21 +1094,21 @@ static int __trace_fprobe_create(int argc, const char *argv[]) len = strlen(&argv[0][1]); if (len > MAX_EVENT_NAME_LEN - 1) { trace_probe_log_err(1, BAD_MAXACT); - goto parse_error; + return -EINVAL; } memcpy(buf, &argv[0][1], len); buf[len] = '\0'; ret = kstrtouint(buf, 0, &maxactive); if (ret || !maxactive) { trace_probe_log_err(1, BAD_MAXACT); - goto parse_error; + return -EINVAL; } /* fprobe rethook instances are iterated over via a list. The * maximum should stay reasonable. */ if (maxactive > RETHOOK_MAXACTIVE_MAX) { trace_probe_log_err(1, MAXACT_TOO_BIG); - goto parse_error; + return -EINVAL; } } @@ -1123,12 +1117,12 @@ static int __trace_fprobe_create(int argc, const char *argv[]) /* a symbol(or tracepoint) must be specified */ ret = parse_symbol_and_return(argc, argv, &symbol, &is_return, is_tracepoint); if (ret < 0) - goto parse_error; + return -EINVAL; if (!is_return && maxactive) { trace_probe_log_set_index(0); trace_probe_log_err(1, BAD_MAXACT_TYPE); - goto parse_error; + return -EINVAL; } trace_probe_log_set_index(0); @@ -1136,7 +1130,7 @@ static int __trace_fprobe_create(int argc, const char *argv[]) ret = traceprobe_parse_event_name(&event, &group, gbuf, event - argv[0]); if (ret) - goto parse_error; + return -EINVAL; } if (!event) { @@ -1152,49 +1146,44 @@ static int __trace_fprobe_create(int argc, const char *argv[]) } if (is_return) - ctx.flags |= TPARG_FL_RETURN; + ctx->flags |= TPARG_FL_RETURN; else - ctx.flags |= TPARG_FL_FENTRY; + ctx->flags |= TPARG_FL_FENTRY; if (is_tracepoint) { - ctx.flags |= TPARG_FL_TPOINT; + ctx->flags |= TPARG_FL_TPOINT; tpoint = find_tracepoint(symbol, &tp_mod); if (tpoint) { - ctx.funcname = kallsyms_lookup( + ctx->funcname = kallsyms_lookup( (unsigned long)tpoint->probestub, NULL, NULL, NULL, sbuf); } else if (IS_ENABLED(CONFIG_MODULES)) { /* This *may* be loaded afterwards */ tpoint = TRACEPOINT_STUB; - ctx.funcname = symbol; + ctx->funcname = symbol; } else { trace_probe_log_set_index(1); trace_probe_log_err(0, NO_TRACEPOINT); - goto parse_error; + return -EINVAL; } } else - ctx.funcname = symbol; + ctx->funcname = symbol; argc -= 2; argv += 2; new_argv = traceprobe_expand_meta_args(argc, argv, &new_argc, - abuf, MAX_BTF_ARGS_LEN, &ctx); - if (IS_ERR(new_argv)) { - ret = PTR_ERR(new_argv); - new_argv = NULL; - goto out; - } + abuf, MAX_BTF_ARGS_LEN, ctx); + if (IS_ERR(new_argv)) + return PTR_ERR(new_argv); if (new_argv) { argc = new_argc; argv = new_argv; } - if (argc > MAX_TRACE_ARGS) { - ret = -E2BIG; - goto out; - } + if (argc > MAX_TRACE_ARGS) + return -E2BIG; ret = traceprobe_expand_dentry_args(argc, argv, &dbuf); if (ret) - goto out; + return ret; /* setup a probe */ tf = alloc_trace_fprobe(group, event, symbol, tpoint, tp_mod, @@ -1203,16 +1192,16 @@ static int __trace_fprobe_create(int argc, const char *argv[]) ret = PTR_ERR(tf); /* This must return -ENOMEM, else there is a bug */ WARN_ON_ONCE(ret != -ENOMEM); - goto out; /* We know tf is not allocated */ + return ret; } /* parse arguments */ for (i = 0; i < argc; i++) { trace_probe_log_set_index(i + 2); - ctx.offset = 0; - ret = traceprobe_parse_probe_arg(&tf->tp, i, argv[i], &ctx); + ctx->offset = 0; + ret = traceprobe_parse_probe_arg(&tf->tp, i, argv[i], ctx); if (ret) - goto error; /* This can be -ENOMEM */ + return ret; /* This can be -ENOMEM */ } if (is_return && tf->tp.entry_arg) { @@ -1223,7 +1212,7 @@ static int __trace_fprobe_create(int argc, const char *argv[]) ret = traceprobe_set_print_fmt(&tf->tp, is_return ? PROBE_PRINT_RETURN : PROBE_PRINT_NORMAL); if (ret < 0) - goto error; + return ret; ret = register_trace_fprobe(tf); if (ret) { @@ -1234,24 +1223,26 @@ static int __trace_fprobe_create(int argc, const char *argv[]) trace_probe_log_err(0, BAD_PROBE_ADDR); else if (ret != -ENOMEM && ret != -EEXIST) trace_probe_log_err(0, FAIL_REG_PROBE); - goto error; - } + ret = -EINVAL; + } else + /* 'tf' is successfully registered. To avoid freeing, assign NULL. */ + tf = NULL; -out: - if (tp_mod) - module_put(tp_mod); + return ret; +} + +static int __trace_fprobe_create(int argc, const char *argv[]) +{ + struct traceprobe_parse_context ctx = { + .flags = TPARG_FL_KERNEL | TPARG_FL_FPROBE, + }; + int ret; + + trace_probe_log_init("trace_fprobe", argc, argv); + ret = ___trace_fprobe_create(argc, argv, &ctx); traceprobe_finish_parse(&ctx); trace_probe_log_clear(); - kfree(new_argv); - kfree(symbol); - kfree(dbuf); return ret; - -parse_error: - ret = -EINVAL; -error: - free_trace_fprobe(tf); - goto out; } static int trace_fprobe_create(const char *raw_command)