[PATCH 4.8 33/85] Btrfs: fix memory leak in do_walk_down

[Greg Kroah-Hartman]

4.8-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Liu Bo <bo.li....@oracle.com>

commit a958eab0ed7fdc1b977bc25d3af6efedaa945488 upstream.

The extent buffer 'next' needs to be free'd conditionally.

Signed-off-by: Liu Bo <bo.li....@oracle.com>
Reviewed-by: David Sterba <dste...@suse.com>
Signed-off-by: David Sterba <dste...@suse.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 fs/btrfs/extent-tree.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -8886,6 +8886,7 @@ static noinline int do_walk_down(struct
                                       &wc->flags[level - 1]);
        if (ret < 0) {
                btrfs_tree_unlock(next);
+               free_extent_buffer(next);
                return ret;
        }