1 files changed, 2 insertions, 0 deletions

diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c
index c18f81797a88..18d3e168ad0a 100644
--- a/fs/btrfs/dir-item.c
+++ b/fs/btrfs/dir-item.c
@@ -35,6 +35,8 @@ int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
         btrfs_set_dir_name_len(dir_item, name_len);
         name_ptr = (char *)(dir_item + 1);
         memcpy(name_ptr, name, name_len);
+        if (name_ptr + name_len > path.nodes[0]->b_data + 4096)
+                WARN_ON(1);
         mark_buffer_dirty(path.nodes[0]);
 out:
         btrfs_release_path(root, &path);