void sock_rfree(struct sk_buff *skb)
{
	struct sock *sk = skb->sk;
	unsigned int len = skb->truesize;

	atomic_sub(len, &sk->sk_rmem_alloc);
	sk_mem_uncharge(sk, 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.