[PATCH 01/14] run_diff_files(): delay allocation of combine_diff_path
- From
Jeff King <peff@peff.net>
- Date
- Jan 9, 2025, 08:28 UTC
- Message-ID
- <20250109082818.GA2748836@coredump.intra.peff.net>
- In-Reply-To
- <20250109082723.GA2748497@coredump.intra.peff.net>
While looping over the index entries, when we see a higher level stage the first thing we do is allocate a combine_diff_path struct for it. But this can leak; if check_removed() returns an error, we'll continue to the next iteration of the loop without cleaning up.
We can fix this by just delaying the allocation by a few lines.
I don't think this leak is triggered in the test suite, but it's pretty easy to see by inspection. My ulterior motive here is that the delayed allocation means we have all of the data needed to initialize "dpath" at the time of malloc, making it easier to factor out a constructor function.
Signed-off-by: Jeff King <peff@peff.net> --- diff-lib.c | 24 ++++++++++++------------ 1 file changed, 12 insertions(+), 12 deletions(-)
diff --git a/diff-lib.c b/diff-lib.c index c6d3bc4d37..85b8f1fa59 100644 --- a/diff-lib.c +++ b/diff-lib.c @@ -156,18 +156,6 @@ void run_diff_files(struct rev_info *revs, unsigned int option) size_t path_len; struct stat st; - path_len = ce_namelen(ce); - - dpath = xmalloc(combine_diff_path_size(5, path_len)); - dpath->path = (char *) &(dpath->parent[5]); - - dpath->next = NULL; - memcpy(dpath->path, ce->name, path_len); - dpath->path[path_len] = '\0'; - oidclr(&dpath->oid, the_repository->hash_algo); - memset(&(dpath->parent[0]), 0, - sizeof(struct combine_diff_parent)*5); - changed = check_removed(ce, &st); if (!changed) wt_mode = ce_mode_from_stat(ce, st.st_mode); @@ -178,7 +166,19 @@ void run_diff_files(struct rev_info *revs, unsigned int option) } wt_mode = 0; } + + path_len = ce_namelen(ce); + + dpath = xmalloc(combine_diff_path_size(5, path_len)); + dpath->path = (char *) &(dpath->parent[5]); + + dpath->next = NULL; + memcpy(dpath->path, ce->name, path_len); + dpath->path[path_len] = '\0'; + oidclr(&dpath->oid, the_repository->hash_algo); dpath->mode = wt_mode; + memset(&(dpath->parent[0]), 0, + sizeof(struct combine_diff_parent)*5); while (i < entries) { struct cache_entry *nce = istate->cache[i];
-- 2.48.0.rc2.413.gc1c80375a3