commit 91ca338d776e0cefb255bf2979b6448febd880f5
author Tsutomu Itoh <t-itoh@jp.fujitsu.com> Wed Jan 05 02:32:22 2011 +0000
committer Chris Mason <chris.mason@oracle.com> Sun Jan 16 11:30:20 2011 -0500
tree 5d1d344d6ed565faf5612b5c695f00c04e6f01d8
parent ff175d57f057f77d2d3031d674c2af9167a4af02

btrfs: check NULL or not

Should check if functions returns NULL or not.

Signed-off-by: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

fs/btrfs/ctree.c

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 99599f1..b5baff0 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -2516,6 +2516,9 @@
 	btrfs_assert_tree_locked(path->nodes[1]);
 
 	right = read_node_slot(root, upper, slot + 1);
+	if (right == NULL)
+		return 1;
+
 	btrfs_tree_lock(right);
 	btrfs_set_lock_blocking(right);
 
@@ -2766,6 +2769,9 @@
 	btrfs_assert_tree_locked(path->nodes[1]);
 
 	left = read_node_slot(root, path->nodes[1], slot - 1);
+	if (left == NULL)
+		return 1;
+
 	btrfs_tree_lock(left);
 	btrfs_set_lock_blocking(left);