--- zzzz-none-000/linux-4.4.60/drivers/md/dm-ioctl.c	2017-04-08 07:53:53.000000000 +0000
+++ scorpion-7490-727/linux-4.4.60/drivers/md/dm-ioctl.c	2021-02-04 17:41:59.000000000 +0000
@@ -1843,7 +1843,7 @@
 	if (r)
 		goto out;
 
-	param->data_size = sizeof(*param);
+	param->data_size = offsetof(struct dm_ioctl, data);
 	r = fn(param, input_param_size);
 
 	if (unlikely(param->flags & DM_BUFFER_FULL_FLAG) &&