void rose_requeue_frames(struct sock *sk)
{
	struct sk_buff *skb, *skb_prev = NULL;

	/*
	 * Requeue all the un-ack-ed frames on the output queue to be picked
	 * up by rose_kick. This arrangement handles the possibility of an
	 * empty output queue.
	 */
	while ((skb = skb_dequeue(&rose_sk(sk)->ack_queue)) != NULL) {
		if (skb_prev == NULL)
			skb_queue_head(&sk->sk_write_queue, skb);
		else
			skb_append(skb_prev, skb, &sk->sk_write_queue);
		skb_prev = skb;
	}
}

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.