Btrfs: fix verification of dir_item

We were ignoring the name component of the dir_item. Both the
name and data must fit within BTRFS_MAX_XATTR_SIZE(root).
Signed-off-by: NFilipe David Borba Manana <fdmanana@gmail.com>
Signed-off-by: NJosef Bacik <jbacik@fusionio.com>
Signed-off-by: NChris Mason <chris.mason@fusionio.com>

fs/btrfs/dir-item.c

@@ -474,8 +474,10 @@ int verify_dir_item(struct btrfs_root *root,
 	}
 
 	/* BTRFS_MAX_XATTR_SIZE is the same for all dir items */
-	if (btrfs_dir_data_len(leaf, dir_item) > BTRFS_MAX_XATTR_SIZE(root)) {
-		printk(KERN_CRIT "btrfs: invalid dir item data len: %u\n",
+	if ((btrfs_dir_data_len(leaf, dir_item) +
+	     btrfs_dir_name_len(leaf, dir_item)) > BTRFS_MAX_XATTR_SIZE(root)) {
+		printk(KERN_CRIT "btrfs: invalid dir item name + data len: %u + %u\n",
+		       (unsigned)btrfs_dir_name_len(leaf, dir_item),
 		       (unsigned)btrfs_dir_data_len(leaf, dir_item));
 		return 1;
 	}