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| author | Patrick Steinhardt <ps@pks.im> | 2024-08-14 08:52:14 +0200 |
|---|---|---|
| committer | Junio C Hamano <gitster@pobox.com> | 2024-08-14 10:07:58 -0700 |
| commit | 648abbe22d55a6004bf6dafa7c0ed209572c9fe9 (patch) | |
| tree | b95fe9852fc035c286edc275095d41869c7ffdf2 | |
| parent | 5f6519b62c636edfff4e1ffd6591917a53616b42 (diff) | |
| download | git-648abbe22d55a6004bf6dafa7c0ed209572c9fe9.tar.gz | |
config: fix leaking comment character config
When the comment line character has been specified multiple times in the
configuration, then `git_default_core_config()` will cause a memory leak
because it unconditionally copies the string into `comment_line_str`
without free'ing the previous value. In fact, it can't easily free the
value in the first place because it may contain a string constant.
Refactor the code such that we track allocated comment character strings
via a separate non-constant variable `comment_line_str_to_free`. Adapt
sites that set `comment_line_str` to set both and free the old value
that was stored in `comment_line_str_to_free`.
This memory leak is being hit in t3404. As there are still other memory
leaks in that file we cannot yet mark it as passing with leak checking
enabled.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
| -rw-r--r-- | builtin/commit.c | 7 | ||||
| -rw-r--r-- | config.c | 3 | ||||
| -rw-r--r-- | environment.c | 1 | ||||
| -rw-r--r-- | environment.h | 1 |
4 files changed, 9 insertions, 3 deletions
diff --git a/builtin/commit.c b/builtin/commit.c index 66427ba82d..b2033c4887 100644 --- a/builtin/commit.c +++ b/builtin/commit.c @@ -684,7 +684,9 @@ static void adjust_comment_line_char(const struct strbuf *sb) const char *p; if (!memchr(sb->buf, candidates[0], sb->len)) { - comment_line_str = xstrfmt("%c", candidates[0]); + free(comment_line_str_to_free); + comment_line_str = comment_line_str_to_free = + xstrfmt("%c", candidates[0]); return; } @@ -705,7 +707,8 @@ static void adjust_comment_line_char(const struct strbuf *sb) if (!*p) die(_("unable to select a comment character that is not used\n" "in the current commit message")); - comment_line_str = xstrfmt("%c", *p); + free(comment_line_str_to_free); + comment_line_str = comment_line_str_to_free = xstrfmt("%c", *p); } static void prepare_amend_commit(struct commit *commit, struct strbuf *sb, @@ -1596,7 +1596,8 @@ static int git_default_core_config(const char *var, const char *value, else if (value[0]) { if (strchr(value, '\n')) return error(_("%s cannot contain newline"), var); - comment_line_str = xstrdup(value); + comment_line_str = value; + FREE_AND_NULL(comment_line_str_to_free); auto_comment_line_char = 0; } else return error(_("%s must have at least one character"), var); diff --git a/environment.c b/environment.c index 5cea2c9f54..1d6c48b52d 100644 --- a/environment.c +++ b/environment.c @@ -114,6 +114,7 @@ int protect_ntfs = PROTECT_NTFS_DEFAULT; * that is subject to stripspace. */ const char *comment_line_str = "#"; +char *comment_line_str_to_free; int auto_comment_line_char; /* Parallel index stat data preload? */ diff --git a/environment.h b/environment.h index e9f01d4d11..0148738ed6 100644 --- a/environment.h +++ b/environment.h @@ -9,6 +9,7 @@ struct strvec; * that is subject to stripspace. */ extern const char *comment_line_str; +extern char *comment_line_str_to_free; extern int auto_comment_line_char; /* |