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: Filipe David Borba Manana <fdmanana@gmail.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c
index 1c529db1697f..c031ea3fd70f 100644
--- a/fs/btrfs/dir-item.c
+++ b/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;
         }