static int __netlink_sendskb(struct sock *sk, struct sk_buff *skb)
{
	int len = skb->len;

	netlink_deliver_tap(skb);

#ifdef CONFIG_NETLINK_MMAP
	if (netlink_skb_is_mmaped(skb))
		netlink_queue_mmaped_skb(sk, skb);
	else if (netlink_rx_is_mmaped(sk))
		netlink_ring_set_copied(sk, skb);
	else
#endif /* CONFIG_NETLINK_MMAP */
		skb_queue_tail(&sk->sk_receive_queue, skb);
	sk->sk_data_ready(sk, len);
	return len;
}

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.