void virtqueue_map(VirtQueueElement *elem)
{
    virtqueue_map_iovec(elem->in_sg, elem->in_addr, &elem->in_num,
                        VIRTQUEUE_MAX_SIZE, 1);
    virtqueue_map_iovec(elem->out_sg, elem->out_addr, &elem->out_num,
                        VIRTQUEUE_MAX_SIZE, 0);
}

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.