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>
git-mirror · Mar 4, 2013 · 8f71f3e · 8f71f3e
1 parent 00d71c9
commit 8f71f3e
Showing 1 changed file with 2 additions and 0 deletions.
diff --git 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) {