int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
{
	struct inet_sock *inet = inet_sk(sk);
	struct sockaddr_in *usin = (struct sockaddr_in *) uaddr;
	struct flowi4 *fl4;
	struct rtable *rt;
	__be32 saddr;
	int oif;
	int err;


	if (addr_len < sizeof(*usin))
		return -EINVAL;

	if (usin->sin_family != AF_INET)
		return -EAFNOSUPPORT;

	sk_dst_reset(sk);

	lock_sock(sk);

	oif = sk->sk_bound_dev_if;
	saddr = inet->inet_saddr;
	if (ipv4_is_multicast(usin->sin_addr.s_addr)) {
		if (!oif)
			oif = inet->mc_index;
		if (!saddr)
			saddr = inet->mc_addr;
	}
	fl4 = &inet->cork.fl.u.ip4;
	rt = ip_route_connect(fl4, usin->sin_addr.s_addr, saddr,
			      RT_CONN_FLAGS(sk), oif,
			      sk->sk_protocol,
			      inet->inet_sport, usin->sin_port, sk);
	if (IS_ERR(rt)) {
		err = PTR_ERR(rt);
		if (err == -ENETUNREACH)
			IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTNOROUTES);
		goto out;
	}

	if ((rt->rt_flags & RTCF_BROADCAST) && !sock_flag(sk, SOCK_BROADCAST)) {
		ip_rt_put(rt);
		err = -EACCES;
		goto out;
	}
	if (!inet->inet_saddr)
		inet->inet_saddr = fl4->saddr;	/* Update source address */
	if (!inet->inet_rcv_saddr) {
		inet->inet_rcv_saddr = fl4->saddr;
		if (sk->sk_prot->rehash)
			sk->sk_prot->rehash(sk);
	}
	inet->inet_daddr = fl4->daddr;
	inet->inet_dport = usin->sin_port;
	sk->sk_state = TCP_ESTABLISHED;
	inet->inet_id = jiffies;

	sk_dst_set(sk, &rt->dst);
	err = 0;
out:
	release_sock(sk);
	return err;
 }

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.