Btrfs: fix possible memory leak in the find_parent_nodes()

In the find_parent_nodes(), if read_tree_block() fails, we can
not return directly, we should free some allocated memory otherwise
memory leak happens.

Signed-off-by: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index b4fb41558111..290e347b6db3 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -918,7 +918,8 @@ again:
                                                            ref->parent, bsz, 0);
                                 if (!eb || !extent_buffer_uptodate(eb)) {
                                         free_extent_buffer(eb);
-                                        return -EIO;
+                                        ret = -EIO;
+                                        goto out;
                                 }
                                 ret = find_extent_in_eb(eb, bytenr,
                                                         *extent_item_pos, &eie);