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>
diff --git a/builtin/commit.c b/builtin/commit.c
index 66427ba..b2033c4 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,
