From f53559227ccb600f4fdd1bfe08e1164a5aed60b5 Mon Sep 17 00:00:00 2001 From: Johannes Schindelin Date: Wed, 15 Jun 2022 23:35:39 +0000 Subject: submodule-config: avoid memory leak In 961b130d20c9 (branch: add --recurse-submodules option for branch creation, 2022-01-28), a funny pattern was introduced where first some struct is `xmalloc()`ed, then we resize an array whose element type is the same struct, and then the first struct's contents are copied into the last element of that array. Crucially, the `xmalloc()`ed memory never gets released. Let's avoid that memory leak and that memory allocation dance altogether by first reallocating the array, then using a pointer to the last array element to go forward. Reported by Coverity. Signed-off-by: Johannes Schindelin Signed-off-by: Junio C Hamano --- submodule-config.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'submodule-config.c') diff --git a/submodule-config.c b/submodule-config.c index ce3beaf5d4..51ecbe901e 100644 --- a/submodule-config.c +++ b/submodule-config.c @@ -756,7 +756,10 @@ static void traverse_tree_submodules(struct repository *r, if (S_ISGITLINK(name_entry->mode) && is_tree_submodule_active(r, root_tree, tree_path)) { - st_entry = xmalloc(sizeof(*st_entry)); + ALLOC_GROW(out->entries, out->entry_nr + 1, + out->entry_alloc); + st_entry = &out->entries[out->entry_nr++]; + st_entry->name_entry = xmalloc(sizeof(*st_entry->name_entry)); *st_entry->name_entry = *name_entry; st_entry->submodule = @@ -766,9 +769,6 @@ static void traverse_tree_submodules(struct repository *r, root_tree)) FREE_AND_NULL(st_entry->repo); - ALLOC_GROW(out->entries, out->entry_nr + 1, - out->entry_alloc); - out->entries[out->entry_nr++] = *st_entry; } else if (S_ISDIR(name_entry->mode)) traverse_tree_submodules(r, root_tree, tree_path, &name_entry->oid, out); -- cgit v1.2.3