ref-filter: also free head for ATOM_HEAD to avoid leak

u.head is populated using resolve_refdup(), which returns a newly
allocated string - hence we also need to free() it.

Found while running t0041 with LSAN:

Direct leak of 16 byte(s) in 1 object(s) allocated from:
    #0 0x486804 in strdup ../projects/compiler-rt/lib/asan/asan_interceptors.cpp:452:3
    #1 0xa8be98 in xstrdup wrapper.c:29:14
    #2 0x9481db in head_atom_parser ref-filter.c:549:17
    #3 0x9408c7 in parse_ref_filter_atom ref-filter.c:703:30
    #4 0x9400e3 in verify_ref_format ref-filter.c:974:8
    #5 0x4f9e8b in print_ref_list builtin/branch.c:439:6
    #6 0x4f9e8b in cmd_branch builtin/branch.c:757:3
    #7 0x4ce83e in run_builtin git.c:475:11
    #8 0x4ccafe in handle_builtin git.c:729:3
    #9 0x4cb01c in run_argv git.c:818:4
    #10 0x4cb01c in cmd_main git.c:949:19
    #11 0x6bdc2d in main common-main.c:52:11
    #12 0x7f96edf86349 in __libc_start_main (/lib64/libc.so.6+0x24349)

SUMMARY: AddressSanitizer: 16 byte(s) leaked in 1 allocation(s).

Signed-off-by: Andrzej Hunt <andrzej@ahunt.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/ref-filter.c b/ref-filter.c
index 4db0e40ff4c6251aa808738e1630db1e397956de..f8bfd25ae4f8f3e26745df5da8a30db731f62663 100644 (file)
--- a/ref-filter.c
+++ b/ref-filter.c
@@ -2225,8 +2225,12 @@ void ref_array_clear(struct ref_array *array)
        FREE_AND_NULL(array->items);
        array->nr = array->alloc = 0;
 
-       for (i = 0; i < used_atom_cnt; i++)
-               free((char *)used_atom[i].name);
+       for (i = 0; i < used_atom_cnt; i++) {
+               struct used_atom *atom = &used_atom[i];
+               if (atom->atom_type == ATOM_HEAD)
+                       free(atom->u.head);
+               free((char *)atom->name);
+       }
        FREE_AND_NULL(used_atom);
        used_atom_cnt = 0;