static int atalk_connect(struct socket *sock, struct sockaddr *uaddr,
			 int addr_len, int flags)
{
	struct sock *sk = sock->sk;
	struct atalk_sock *at = at_sk(sk);
	struct sockaddr_at *addr;
	int err;

	sk->sk_state   = TCP_CLOSE;
	sock->state = SS_UNCONNECTED;

	if (addr_len != sizeof(*addr))
		return -EINVAL;

	addr = (struct sockaddr_at *)uaddr;

	if (addr->sat_family != AF_APPLETALK)
		return -EAFNOSUPPORT;

	if (addr->sat_addr.s_node == ATADDR_BCAST &&
	    !sock_flag(sk, SOCK_BROADCAST)) {
#if 1
		pr_warn("atalk_connect: %s is broken and did not set SO_BROADCAST.\n",
			current->comm);
#else
		return -EACCES;
#endif
	}

	lock_sock(sk);
	err = -EBUSY;
	if (sock_flag(sk, SOCK_ZAPPED))
		if (atalk_autobind(sk) < 0)
			goto out;

	err = -ENETUNREACH;
	if (!atrtr_get_dev(&addr->sat_addr))
		goto out;

	at->dest_port = addr->sat_port;
	at->dest_net  = addr->sat_addr.s_net;
	at->dest_node = addr->sat_addr.s_node;

	sock->state  = SS_CONNECTED;
	sk->sk_state = TCP_ESTABLISHED;
	err = 0;
out:
	release_sock(sk);
	return err;
}

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.