[PATCH 02/26] bisect: fix leaking good/bad terms when reading multipe times
- From
Patrick Steinhardt <ps@pks.im>
- Date
- Nov 6, 2024, 15:10 UTC
- Message-ID
- <cdc06afa6dbb11a0a6ffcdaf20053b66a2fe3974.1730901926.git.ps@pks.im>
- In-Reply-To
- <cover.1730901926.git.ps@pks.im>
Even though `read_bisect_terms()` is declared as assigning string constants, it in fact assigns allocated strings to the `read_bad` and `read_good` out parameters. The only callers of this function assign the result to global variables and thus don't have to free them in order to be leak-free. But that changes when executing the function multiple times because we'd then overwrite the previous value and thus make it unreachable.
Fix the function signature and free the previous values. This leak is exposed by t0630, but plugging it does not make the whole test suite pass.
Signed-off-by: Patrick Steinhardt <ps@pks.im> --- bisect.c | 14 +++++++++----- bisect.h | 2 +- revision.c | 4 ++-- 3 files changed, 12 insertions(+), 8 deletions(-)
diff --git a/bisect.c b/bisect.c index 4713226fad4..9c52241050c 100644 --- a/bisect.c +++ b/bisect.c @@ -28,8 +28,8 @@ static struct oid_array skipped_revs; static struct object_id *current_bad_oid; -static const char *term_bad; -static const char *term_good; +static char *term_bad; +static char *term_good; /* Remember to update object flag allocation in object.h */ #define COUNTED (1u<<16) @@ -985,7 +985,7 @@ static void show_commit(struct commit *commit) * We read them and store them to adapt the messages accordingly. * Default is bad/good. */ -void read_bisect_terms(const char **read_bad, const char **read_good) +void read_bisect_terms(char **read_bad, char **read_good) { struct strbuf str = STRBUF_INIT; const char *filename = git_path_bisect_terms(); @@ -993,16 +993,20 @@ void read_bisect_terms(const char **read_bad, const char **read_good) if (!fp) { if (errno == ENOENT) { - *read_bad = "bad"; - *read_good = "good"; + free(*read_bad); + *read_bad = xstrdup("bad"); + free(*read_good); + *read_good = xstrdup("good"); return; } else { die_errno(_("could not read file '%s'"), filename); } } else { strbuf_getline_lf(&str, fp); + free(*read_bad); *read_bad = strbuf_detach(&str, NULL); strbuf_getline_lf(&str, fp); + free(*read_good); *read_good = strbuf_detach(&str, NULL); } strbuf_release(&str); diff --git a/bisect.h b/bisect.h index ee3fd65f3bd..944439bfac7 100644 --- a/bisect.h +++ b/bisect.h @@ -75,7 +75,7 @@ enum bisect_error bisect_next_all(struct repository *r, const char *prefix); int estimate_bisect_steps(int all); -void read_bisect_terms(const char **bad, const char **good); +void read_bisect_terms(char **bad, char **good); int bisect_clean_state(void); diff --git a/revision.c b/revision.c index 8df75b82249..347dabf7f9a 100644 --- a/revision.c +++ b/revision.c @@ -51,8 +51,8 @@ volatile show_early_output_fn_t show_early_output; -static const char *term_bad; -static const char *term_good; +static char *term_bad; +static char *term_good; implement_shared_commit_slab(revision_sources, char *);
-- 2.47.0.229.g8f8d6eee53.dirty