btrfs: initialize return variable in cleanup_free_space_cache_v1

commit 77364faf21b4105ee5adbb4844fdfb461334d249 upstream.

Static analysis reports this problem

  free-space-cache.c:3965:2: warning: Undefined or garbage value returned
    return ret;
    ^~~~~~~~~~

ret is set in the node handling loop.  Treat doing nothing as a success
and initialize ret to 0, although it's unlikely the loop would be
skipped. We always have block groups, but as it could lead to
transaction abort in the caller it's better to be safe.

CC: stable@vger.kernel.org # 5.12+
Signed-off-by: Tom Rix <trix@redhat.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index 9988decd5717bd4ca73dcdd9d02fb6c1bda9903a..ac9c2691376d628bf80eaa154ea482a64c96327b 100644 (file)
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -3942,7 +3942,7 @@ static int cleanup_free_space_cache_v1(struct btrfs_fs_info *fs_info,
 {
        struct btrfs_block_group *block_group;
        struct rb_node *node;
-       int ret;
+       int ret = 0;
 
        btrfs_info(fs_info, "cleaning free space cache v1");