[PATCH] Btrfs: fix possible memory leak in the find_parent_nodes()

[Wang Shilong <wangsl-fnst@cn.fujitsu.com>]

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>
---
Since Chris has already setup his pull, we'd like to send
another patch.
---
 fs/btrfs/backref.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index b4fb415..290e347 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);
-- 
1.7.7.6