[PATCH 5.9 188/255] btrfs: ref-verify: fix memory leak in btrfs_ref_tree_mod

[Greg Kroah-Hartman]

From: Dinghao Liu <dinghao.liu@xxxxxxxxxx>

commit 468600c6ec28613b756193c5f780aac062f1acdf upstream.

There is one error handling path that does not free ref, which may cause
a minor memory leak.

CC: stable@xxxxxxxxxxxxxxx # 4.19+
Reviewed-by: Josef Bacik <josef@xxxxxxxxxxxxxx>
Signed-off-by: Dinghao Liu <dinghao.liu@xxxxxxxxxx>
Reviewed-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 fs/btrfs/ref-verify.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/btrfs/ref-verify.c
+++ b/fs/btrfs/ref-verify.c
@@ -860,6 +860,7 @@ int btrfs_ref_tree_mod(struct btrfs_fs_i
 "dropping a ref for a root that doesn't have a ref on the block");
 			dump_block_entry(fs_info, be);
 			dump_ref_action(fs_info, ra);
+			kfree(ref);
 			kfree(ra);
 			goto out_unlock;
 		}