static int do_one_set_err(struct sock *sk, struct netlink_set_err_data *p)
{
	struct netlink_sock *nlk = nlk_sk(sk);
	int ret = 0;

	if (sk == p->exclude_sk)
		goto out;

	if (!net_eq(sock_net(sk), sock_net(p->exclude_sk)))
		goto out;

	if (nlk->portid == p->portid || p->group - 1 >= nlk->ngroups ||
	    !test_bit(p->group - 1, nlk->groups))
		goto out;

	if (p->code == ENOBUFS && nlk->flags & NETLINK_RECV_NO_ENOBUFS) {
		ret = 1;
		goto out;
	}

	sk->sk_err = p->code;
	sk->sk_error_report(sk);
out:
	return ret;
}

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.