static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
{
	const struct xfrm_tmpl *t;
	int sockaddr_size = pfkey_sockaddr_size(xp->family);
	int socklen = 0;
	int i;

	for (i=0; i<xp->xfrm_nr; i++) {
		t = xp->xfrm_vec + i;
		socklen += pfkey_sockaddr_len(t->encap_family);
	}

	return sizeof(struct sadb_msg) +
		(sizeof(struct sadb_lifetime) * 3) +
		(sizeof(struct sadb_address) * 2) +
		(sockaddr_size * 2) +
		sizeof(struct sadb_x_policy) +
		(xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
		(socklen * 2) +
		pfkey_xfrm_policy2sec_ctx_size(xp);
}

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.