static u32 filter_rcv(struct sock *sk, struct sk_buff *buf)
{
	struct socket *sock = sk->sk_socket;
	struct tipc_msg *msg = buf_msg(buf);
	unsigned int limit = rcvbuf_limit(sk, buf);
	u32 res = TIPC_OK;

	/* Reject message if it is wrong sort of message for socket */
	if (msg_type(msg) > TIPC_DIRECT_MSG)
		return TIPC_ERR_NO_PORT;

	if (sock->state == SS_READY) {
		if (msg_connected(msg))
			return TIPC_ERR_NO_PORT;
	} else {
		res = filter_connect(tipc_sk(sk), &buf);
		if (res != TIPC_OK || buf == NULL)
			return res;
	}

	/* Reject message if there isn't room to queue it */
	if (sk_rmem_alloc_get(sk) + buf->truesize >= limit)
		return TIPC_ERR_OVERLOAD;

	/* Enqueue message */
	TIPC_SKB_CB(buf)->handle = NULL;
	__skb_queue_tail(&sk->sk_receive_queue, buf);
	skb_set_owner_r(buf, sk);

	sk->sk_data_ready(sk, 0);
	return TIPC_OK;
}

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.