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Wed, 14 Aug 2024 02:52:51 -0400 (EDT) Received: by vm-mail (OpenSMTPD) with ESMTPSA id 8b0c86f0 (TLSv1.3:TLS_AES_256_GCM_SHA384:256:NO); Wed, 14 Aug 2024 06:52:33 +0000 (UTC) Date: Wed, 14 Aug 2024 08:52:50 +0200 From: Patrick Steinhardt To: git@vger.kernel.org Cc: James Liu , karthik nayak , Phillip Wood , Junio C Hamano , Taylor Blau Subject: [PATCH v4 19/22] userdiff: fix leaking memory for configured diff drivers Message-ID: References: Precedence: bulk X-Mailing-List: git@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: The userdiff structures may be initialized either statically on the stack or dynamically via configuration keys. In the latter case we end up leaking memory because we didn't have any infrastructure to discern those strings which have been allocated statically and those which have been allocated dynamically. Refactor the code such that we have two pointers for each of these strings: one that holds the value as accessed by other subsystems, and one that points to the same string in case it has been allocated. Like this, we can safely free the second pointer and thus plug those memory leaks. Signed-off-by: Patrick Steinhardt --- range-diff.c | 6 +++-- t/t4018-diff-funcname.sh | 1 + t/t4042-diff-textconv-caching.sh | 2 ++ t/t4048-diff-combined-binary.sh | 1 + t/t4209-log-pickaxe.sh | 2 ++ userdiff.c | 38 ++++++++++++++++++++++++-------- userdiff.h | 4 ++++ 7 files changed, 43 insertions(+), 11 deletions(-) diff --git a/range-diff.c b/range-diff.c index 5f01605550..bbb0952264 100644 --- a/range-diff.c +++ b/range-diff.c @@ -450,8 +450,10 @@ static void output_pair_header(struct diff_options *diffopt, } static struct userdiff_driver section_headers = { - .funcname = { "^ ## (.*) ##$\n" - "^.?@@ (.*)$", REG_EXTENDED } + .funcname = { + .pattern = "^ ## (.*) ##$\n^.?@@ (.*)$", + .cflags = REG_EXTENDED, + }, }; static struct diff_filespec *get_filespec(const char *name, const char *p) diff --git a/t/t4018-diff-funcname.sh b/t/t4018-diff-funcname.sh index e026fac1f4..8128c30e7f 100755 --- a/t/t4018-diff-funcname.sh +++ b/t/t4018-diff-funcname.sh @@ -5,6 +5,7 @@ test_description='Test custom diff function name patterns' +TEST_PASSES_SANITIZE_LEAK=true . ./test-lib.sh test_expect_success 'setup' ' diff --git a/t/t4042-diff-textconv-caching.sh b/t/t4042-diff-textconv-caching.sh index 8ebfa3c1be..a179205394 100755 --- a/t/t4042-diff-textconv-caching.sh +++ b/t/t4042-diff-textconv-caching.sh @@ -1,6 +1,8 @@ #!/bin/sh test_description='test textconv caching' + +TEST_PASSES_SANITIZE_LEAK=true . ./test-lib.sh cat >helper <<'EOF' diff --git a/t/t4048-diff-combined-binary.sh b/t/t4048-diff-combined-binary.sh index 0260cf64f5..f399484bce 100755 --- a/t/t4048-diff-combined-binary.sh +++ b/t/t4048-diff-combined-binary.sh @@ -4,6 +4,7 @@ test_description='combined and merge diff handle binary files and textconv' GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME +TEST_PASSES_SANITIZE_LEAK=true . ./test-lib.sh test_expect_success 'setup binary merge conflict' ' diff --git a/t/t4209-log-pickaxe.sh b/t/t4209-log-pickaxe.sh index 64e1623733..b42fdc54fc 100755 --- a/t/t4209-log-pickaxe.sh +++ b/t/t4209-log-pickaxe.sh @@ -1,6 +1,8 @@ #!/bin/sh test_description='log --grep/--author/--regexp-ignore-case/-S/-G' + +TEST_PASSES_SANITIZE_LEAK=true . ./test-lib.sh test_log () { diff --git a/userdiff.c b/userdiff.c index c4ebb9ff73..989629149f 100644 --- a/userdiff.c +++ b/userdiff.c @@ -399,8 +399,11 @@ static struct userdiff_driver *userdiff_find_by_namelen(const char *name, size_t static int parse_funcname(struct userdiff_funcname *f, const char *k, const char *v, int cflags) { - if (git_config_string((char **) &f->pattern, k, v) < 0) + f->pattern = NULL; + FREE_AND_NULL(f->pattern_owned); + if (git_config_string(&f->pattern_owned, k, v) < 0) return -1; + f->pattern = f->pattern_owned; f->cflags = cflags; return 0; } @@ -444,20 +447,37 @@ int userdiff_config(const char *k, const char *v) return parse_funcname(&drv->funcname, k, v, REG_EXTENDED); if (!strcmp(type, "binary")) return parse_tristate(&drv->binary, k, v); - if (!strcmp(type, "command")) - return git_config_string((char **) &drv->external.cmd, k, v); + if (!strcmp(type, "command")) { + FREE_AND_NULL(drv->external.cmd); + return git_config_string(&drv->external.cmd, k, v); + } if (!strcmp(type, "trustexitcode")) { drv->external.trust_exit_code = git_config_bool(k, v); return 0; } - if (!strcmp(type, "textconv")) - return git_config_string((char **) &drv->textconv, k, v); + if (!strcmp(type, "textconv")) { + int ret; + FREE_AND_NULL(drv->textconv_owned); + ret = git_config_string(&drv->textconv_owned, k, v); + drv->textconv = drv->textconv_owned; + return ret; + } if (!strcmp(type, "cachetextconv")) return parse_bool(&drv->textconv_want_cache, k, v); - if (!strcmp(type, "wordregex")) - return git_config_string((char **) &drv->word_regex, k, v); - if (!strcmp(type, "algorithm")) - return git_config_string((char **) &drv->algorithm, k, v); + if (!strcmp(type, "wordregex")) { + int ret; + FREE_AND_NULL(drv->word_regex_owned); + ret = git_config_string(&drv->word_regex_owned, k, v); + drv->word_regex = drv->word_regex_owned; + return ret; + } + if (!strcmp(type, "algorithm")) { + int ret; + FREE_AND_NULL(drv->algorithm_owned); + ret = git_config_string(&drv->algorithm_owned, k, v); + drv->algorithm = drv->algorithm_owned; + return ret; + } return 0; } diff --git a/userdiff.h b/userdiff.h index 7565930337..827361b0bc 100644 --- a/userdiff.h +++ b/userdiff.h @@ -8,6 +8,7 @@ struct repository; struct userdiff_funcname { const char *pattern; + char *pattern_owned; int cflags; }; @@ -20,11 +21,14 @@ struct userdiff_driver { const char *name; struct external_diff external; const char *algorithm; + char *algorithm_owned; int binary; struct userdiff_funcname funcname; const char *word_regex; + char *word_regex_owned; const char *word_regex_multi_byte; const char *textconv; + char *textconv_owned; struct notes_cache *textconv_cache; int textconv_want_cache; };