From: Liu Bo <bo.li.liu@oracle.com>
Date: Wed, 14 Sep 2016 02:02:27 +0000 (-0700)
Subject: Btrfs: fix memory leak in do_walk_down
X-Git-Tag: firefly_0821_release~176^2~4^2~7^2~37
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=107800061996dc872a9fa72fb806ac9dadf2cb6b;p=firefly-linux-kernel-4.4.55.git

Btrfs: fix memory leak in do_walk_down

commit a958eab0ed7fdc1b977bc25d3af6efedaa945488 upstream.

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

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

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 431364ab9c0e..099645ab986d 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -8488,6 +8488,7 @@ static noinline int do_walk_down(struct btrfs_trans_handle *trans,
 				       &wc->flags[level - 1]);
 	if (ret < 0) {
 		btrfs_tree_unlock(next);
+		free_extent_buffer(next);
 		return ret;
 	}