diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 02ea03d220e86cd8afa9d5cd755dc7a8d957c088..7ff60217ec552da772a5be8a732aeb3bc0b91fe6 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -4438,7 +4438,7 @@ static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info,
 
 	ret = btrfs_get_dev_stats(fs_info, sa);
 
-	if (copy_to_user(arg, sa, sizeof(*sa)))
+	if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa)))
 		ret = -EFAULT;
 
 	kfree(sa);