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Mon, 12 Jun 2023 11:38:53 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 0) id 03E4530A77B79; Mon, 12 Jun 2023 11:38:49 +0200 (CEST) Message-ID: <20230612093540.779825032@infradead.org> User-Agent: quilt/0.66 Date: Mon, 12 Jun 2023 11:07:58 +0200 From: Peter Zijlstra To: torvalds@linux-foundation.org, keescook@chromium.org, gregkh@linuxfoundation.org, pbonzini@redhat.com Cc: masahiroy@kernel.org, nathan@kernel.org, ndesaulniers@google.com, nicolas@fjasle.eu, catalin.marinas@arm.com, will@kernel.org, vkoul@kernel.org, trix@redhat.com, ojeda@kernel.org, peterz@infradead.org, mingo@redhat.com, longman@redhat.com, boqun.feng@gmail.com, dennis@kernel.org, tj@kernel.org, cl@linux.com, acme@kernel.org, mark.rutland@arm.com, alexander.shishkin@linux.intel.com, jolsa@kernel.org, namhyung@kernel.org, irogers@google.com, adrian.hunter@intel.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, bristot@redhat.com, vschneid@redhat.com, paulmck@kernel.org, frederic@kernel.org, quic_neeraju@quicinc.com, joel@joelfernandes.org, josh@joshtriplett.org, mathieu.desnoyers@efficios.com, jiangshanlai@gmail.com, rientjes@google.com, vbabka@suse.cz, roman.gushchin@linux.dev, 42.hyeyoo@gmail.com, apw@canonical.com, joe@perches.com, dwaipayanray1@gmail.com, lukas.bulwahn@gmail.com, john.johansen@canonical.com, paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, dmaengine@vger.kernel.org, llvm@lists.linux.dev, linux-perf-users@vger.kernel.org, rcu@vger.kernel.org, linux-security-module@vger.kernel.org, tglx@linutronix.de, ravi.bangoria@amd.com, error27@gmail.com, luc.vanoostenryck@gmail.com Subject: [PATCH v3 45/57] perf: Simplify perf_event_parse_addr_filter() References: <20230612090713.652690195@infradead.org> MIME-Version: 1.0 Precedence: bulk List-ID: XXX this code needs a cleanup Signed-off-by: Peter Zijlstra (Intel) --- kernel/events/core.c | 56 ++++++++++++++++++++------------------------------- 1 file changed, 22 insertions(+), 34 deletions(-) --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -10495,6 +10495,8 @@ static void free_filters_list(struct lis } } +DEFINE_FREE(filter_list, struct list_head *, if (_T) free_filters_list(_T)) + /* * Free existing address filters and optionally install new ones */ @@ -10658,13 +10660,15 @@ perf_event_parse_addr_filter(struct perf struct list_head *filters) { struct perf_addr_filter *filter = NULL; - char *start, *orig, *filename = NULL; substring_t args[MAX_OPT_ARGS]; int state = IF_STATE_ACTION, token; unsigned int kernel = 0; - int ret = -EINVAL; + char *start; + int ret; - orig = fstr = kstrdup(fstr, GFP_KERNEL); + struct list_head *fguard __free(filter_list) = filters; + char *filename __free(kfree) = NULL; + char *orig __free(kfree) = fstr = kstrdup(fstr, GFP_KERNEL); if (!fstr) return -ENOMEM; @@ -10674,7 +10678,6 @@ perf_event_parse_addr_filter(struct perf [IF_ACT_START] = PERF_ADDR_FILTER_ACTION_START, [IF_ACT_STOP] = PERF_ADDR_FILTER_ACTION_STOP, }; - ret = -EINVAL; if (!*start) continue; @@ -10683,7 +10686,7 @@ perf_event_parse_addr_filter(struct perf if (state == IF_STATE_ACTION) { filter = perf_addr_filter_new(event, filters); if (!filter) - goto fail; + return -EINVAL; } token = match_token(start, if_tokens, args); @@ -10692,7 +10695,7 @@ perf_event_parse_addr_filter(struct perf case IF_ACT_START: case IF_ACT_STOP: if (state != IF_STATE_ACTION) - goto fail; + return -EINVAL; filter->action = actions[token]; state = IF_STATE_SOURCE; @@ -10706,18 +10709,18 @@ perf_event_parse_addr_filter(struct perf case IF_SRC_FILEADDR: case IF_SRC_FILE: if (state != IF_STATE_SOURCE) - goto fail; + return -EINVAL; *args[0].to = 0; ret = kstrtoul(args[0].from, 0, &filter->offset); if (ret) - goto fail; + return ret; if (token == IF_SRC_KERNEL || token == IF_SRC_FILE) { *args[1].to = 0; ret = kstrtoul(args[1].from, 0, &filter->size); if (ret) - goto fail; + return ret; } if (token == IF_SRC_FILE || token == IF_SRC_FILEADDR) { @@ -10725,17 +10728,15 @@ perf_event_parse_addr_filter(struct perf kfree(filename); filename = match_strdup(&args[fpos]); - if (!filename) { - ret = -ENOMEM; - goto fail; - } + if (!filename) + return -ENOMEM; } state = IF_STATE_END; break; default: - goto fail; + return -EINVAL; } /* @@ -10744,19 +10745,17 @@ perf_event_parse_addr_filter(struct perf * attribute. */ if (state == IF_STATE_END) { - ret = -EINVAL; - /* * ACTION "filter" must have a non-zero length region * specified. */ if (filter->action == PERF_ADDR_FILTER_ACTION_FILTER && !filter->size) - goto fail; + return -EINVAL; if (!kernel) { if (!filename) - goto fail; + return -EINVAL; /* * For now, we only support file-based filters @@ -10766,21 +10765,19 @@ perf_event_parse_addr_filter(struct perf * mapped at different virtual addresses in * different processes. */ - ret = -EOPNOTSUPP; if (!event->ctx->task) - goto fail; + return -EOPNOTSUPP; /* look up the path and grab its inode */ ret = kern_path(filename, LOOKUP_FOLLOW, &filter->path); if (ret) - goto fail; + return ret; - ret = -EINVAL; if (!filter->path.dentry || !S_ISREG(d_inode(filter->path.dentry) ->i_mode)) - goto fail; + return -EINVAL; event->addr_filters.nr_file_filters++; } @@ -10795,19 +10792,10 @@ perf_event_parse_addr_filter(struct perf } if (state != IF_STATE_ACTION) - goto fail; - - kfree(filename); - kfree(orig); + return -EINVAL; + no_free_ptr(fguard); // allow filters to escape to the caller return 0; - -fail: - kfree(filename); - free_filters_list(filters); - kfree(orig); - - return ret; } static int