static struct sock *ipxitf_find_socket(struct ipx_interface *intrfc,
					__be16 port)
{
	struct sock *s;

	spin_lock_bh(&intrfc->if_sklist_lock);
	s = __ipxitf_find_socket(intrfc, port);
	if (s)
		sock_hold(s);
	spin_unlock_bh(&intrfc->if_sklist_lock);

	return s;
}

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.