btrfs_scan_one_dir: avoid use-after-free on error path

If we iterate the "goto again" loop, we've called "closedir(dirp)",
yet at the top of the loop, upon malloc failure we "goto fail",
where we test dirp and if non-NULL, call closedir(dirp) again.
* utils.c (btrfs_scan_one_dir): Clear "dirp" after closedir to avoid
use-after-free upon failed fullpath = malloc(...

Signed-off-by: Jim Meyering <meyering@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/utils.c b/utils.c
index ee7fa1b8..7c8c9d3a 100644
--- a/utils.c
+++ b/utils.c
@@ -1021,6 +1021,7 @@ again:
 				     list);
 		list_del(&pending->list);
 		closedir(dirp);
+		dirp = NULL;
 		goto again;
 	}
 	ret = 0;