nfsd_svc(int nrservs, struct net *net)
{
	int	error;
	bool	nfsd_up_before;
	struct nfsd_net *nn = net_generic(net, nfsd_net_id);

	mutex_lock(&nfsd_mutex);
	dprintk("nfsd: creating service\n");

	nrservs = max(nrservs, 0);
	nrservs = min(nrservs, NFSD_MAXSERVS);
	error = 0;

	if (nrservs == 0 && nn->nfsd_serv == NULL)
		goto out;

	error = nfsd_create_serv(net);
	if (error)
		goto out;

	nfsd_up_before = nn->nfsd_net_up;

	error = nfsd_startup_net(nrservs, net);
	if (error)
		goto out_destroy;
	error = nn->nfsd_serv->sv_ops->svo_setup(nn->nfsd_serv,
			NULL, nrservs);
	if (error)
		goto out_shutdown;
	/* We are holding a reference to nn->nfsd_serv which
	 * we don't want to count in the return value,
	 * so subtract 1
	 */
	error = nn->nfsd_serv->sv_nrthreads - 1;
out_shutdown:
	if (error < 0 && !nfsd_up_before)
		nfsd_shutdown_net(net);
out_destroy:
	nfsd_destroy(net);		/* Release server */
out:
	mutex_unlock(&nfsd_mutex);
	return error;
}

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.