diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c index 966eb4b61aed565c7621958c55174140d19824a8..a68c650aad11ab7753f97ea566ee51e2229e006d 100644 --- a/drivers/md/dm-ioctl.c +++ b/drivers/md/dm-ioctl.c @@ -1847,7 +1847,7 @@ static int ctl_ioctl(uint command, struct dm_ioctl __user *user) 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) &&