static int vhost_net_ubuf_put(struct vhost_net_ubuf_ref *ubufs)
{
	int r = atomic_sub_return(1, &ubufs->refcount);
	if (unlikely(!r))
		wake_up(&ubufs->wait);
	return r;
}

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.