1 files changed, 4 insertions, 3 deletions

diff --git a/fs/btrfs/root-tree.c b/fs/btrfs/root-tree.c
index a821b5d1e233..f37dab87de16 100644
--- a/fs/btrfs/root-tree.c
+++ b/fs/btrfs/root-tree.c
@@ -45,6 +45,7 @@ int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
         struct btrfs_leaf *l;
         int ret;
         int slot;
+        struct btrfs_root_item *update_item;
 
         btrfs_init_path(&path);
         ret = btrfs_search_slot(trans, root, key, &path, 0, 1);
@@ -53,9 +54,9 @@ int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
         BUG_ON(ret != 0);
         l = btrfs_buffer_leaf(path.nodes[0]);
         slot = path.slots[0];
-        memcpy(btrfs_item_ptr(l, slot, struct btrfs_root_item), item,
-                sizeof(*item));
-        mark_buffer_dirty(path.nodes[0]);
+        update_item = btrfs_item_ptr(l, slot, struct btrfs_root_item);
+        btrfs_memcpy(root, l, update_item, item, sizeof(*item));
+        btrfs_mark_buffer_dirty(path.nodes[0]);
 out:
         btrfs_release_path(root, &path);
         return ret;