From: Liu Bo <bo.li.liu@oracle.com>
Date: Mon, 4 Mar 2013 16:25:36 +0000 (+0000)
Subject: Btrfs: check for NULL pointer in updating reloc roots
X-Git-Tag: v3.9-rc2~3^2~2^2~6
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=8f71f3e0e4fb5a2445fb93d3057a33aefc4aa30d;p=profile%2Fcommon%2Fkernel-common.git

Btrfs: check for NULL pointer in updating reloc roots

Add a check for NULL pointer to avoid invalid reference.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
---

diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index ba5a321..16e0c6f 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -1269,6 +1269,8 @@ static int __update_reloc_root(struct btrfs_root *root, int del)
 	}
 	spin_unlock(&rc->reloc_root_tree.lock);
 
+	if (!node)
+		return 0;
 	BUG_ON((struct btrfs_root *)node->data != root);
 
 	if (!del) {