read_tree_block may take a reference on the 'eb', a following
free_extent_buffer is necessary.

Signed-off-by: Liu Bo <[email protected]>
---
This is based on the latest for-linus-4.1.

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

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 0ec3acd..a129254 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -7922,6 +7922,7 @@ walk_down:
                        eb = read_tree_block(root, child_bytenr, child_gen);
                        if (!eb || !extent_buffer_uptodate(eb)) {
                                ret = -EIO;
+                               free_extent_buffer(eb);
                                goto out;
                        }
 
-- 
2.1.0

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