static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
{
	struct pfkey_sock *pfk = pfkey_sk(sk);
	int satype = hdr->sadb_msg_satype;
	bool reset_errno = false;

	if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
		reset_errno = true;
		if (satype != 0 && satype != 1)
			return -EINVAL;
		pfk->promisc = satype;
	}
	if (reset_errno && skb_cloned(skb))
		skb = skb_copy(skb, GFP_KERNEL);
	else
		skb = skb_clone(skb, GFP_KERNEL);

	if (reset_errno && skb) {
		struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
		new_hdr->sadb_msg_errno = 0;
	}

	pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
	return 0;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.