int cipso_v4_sock_setattr(struct sock *sk,
			  const struct cipso_v4_doi *doi_def,
			  const struct netlbl_lsm_secattr *secattr)
{
	int ret_val = -EPERM;
	unsigned char *buf = NULL;
	u32 buf_len;
	u32 opt_len;
	struct ip_options_rcu *old, *opt = NULL;
	struct inet_sock *sk_inet;
	struct inet_connection_sock *sk_conn;

	/* In the case of sock_create_lite(), the sock->sk field is not
	 * defined yet but it is not a problem as the only users of these
	 * "lite" PF_INET sockets are functions which do an accept() call
	 * afterwards so we will label the socket as part of the accept(). */
	if (sk == NULL)
		return 0;

	/* We allocate the maximum CIPSO option size here so we are probably
	 * being a little wasteful, but it makes our life _much_ easier later
	 * on and after all we are only talking about 40 bytes. */
	buf_len = CIPSO_V4_OPT_LEN_MAX;
	buf = kmalloc(buf_len, GFP_ATOMIC);
	if (buf == NULL) {
		ret_val = -ENOMEM;
		goto socket_setattr_failure;
	}

	ret_val = cipso_v4_genopt(buf, buf_len, doi_def, secattr);
	if (ret_val < 0)
		goto socket_setattr_failure;
	buf_len = ret_val;

	/* We can't use ip_options_get() directly because it makes a call to
	 * ip_options_get_alloc() which allocates memory with GFP_KERNEL and
	 * we won't always have CAP_NET_RAW even though we _always_ want to
	 * set the IPOPT_CIPSO option. */
	opt_len = (buf_len + 3) & ~3;
	opt = kzalloc(sizeof(*opt) + opt_len, GFP_ATOMIC);
	if (opt == NULL) {
		ret_val = -ENOMEM;
		goto socket_setattr_failure;
	}
	memcpy(opt->opt.__data, buf, buf_len);
	opt->opt.optlen = opt_len;
	opt->opt.cipso = sizeof(struct iphdr);
	kfree(buf);
	buf = NULL;

	sk_inet = inet_sk(sk);

	old = rcu_dereference_protected(sk_inet->inet_opt, sock_owned_by_user(sk));
	if (sk_inet->is_icsk) {
		sk_conn = inet_csk(sk);
		if (old)
			sk_conn->icsk_ext_hdr_len -= old->opt.optlen;
		sk_conn->icsk_ext_hdr_len += opt->opt.optlen;
		sk_conn->icsk_sync_mss(sk, sk_conn->icsk_pmtu_cookie);
	}
	rcu_assign_pointer(sk_inet->inet_opt, opt);
	if (old)
		kfree_rcu(old, rcu);

	return 0;

socket_setattr_failure:
	kfree(buf);
	kfree(opt);
	return ret_val;
}

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.