static int cma_iboe_join_multicast(struct rdma_id_private *id_priv,
				   struct cma_multicast *mc)
{
	struct iboe_mcast_work *work;
	struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
	int err;
	struct sockaddr *addr = (struct sockaddr *)&mc->addr;
	struct net_device *ndev = NULL;

	if (cma_zero_addr((struct sockaddr *)&mc->addr))
		return -EINVAL;

	work = kzalloc(sizeof *work, GFP_KERNEL);
	if (!work)
		return -ENOMEM;

	mc->multicast.ib = kzalloc(sizeof(struct ib_sa_multicast), GFP_KERNEL);
	if (!mc->multicast.ib) {
		err = -ENOMEM;
		goto out1;
	}

	cma_iboe_set_mgid(addr, &mc->multicast.ib->rec.mgid);

	mc->multicast.ib->rec.pkey = cpu_to_be16(0xffff);
	if (id_priv->id.ps == RDMA_PS_UDP)
		mc->multicast.ib->rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);

	if (dev_addr->bound_dev_if)
		ndev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
	if (!ndev) {
		err = -ENODEV;
		goto out2;
	}
	mc->multicast.ib->rec.rate = iboe_get_rate(ndev);
	mc->multicast.ib->rec.hop_limit = 1;
	mc->multicast.ib->rec.mtu = iboe_get_mtu(ndev->mtu);
	dev_put(ndev);
	if (!mc->multicast.ib->rec.mtu) {
		err = -EINVAL;
		goto out2;
	}
	rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
		    &mc->multicast.ib->rec.port_gid);
	work->id = id_priv;
	work->mc = mc;
	INIT_WORK(&work->work, iboe_mcast_work_handler);
	kref_get(&mc->mcref);
	queue_work(cma_wq, &work->work);

	return 0;

out2:
	kfree(mc->multicast.ib);
out1:
	kfree(work);
	return err;
}

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.