static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
{
 	struct rdma_id_private *listen_id, *conn_id;
 	struct rdma_cm_event event;
 	int offset, ret;
 
 	listen_id = cm_id->context;
 	if (!cma_check_req_qp_type(&listen_id->id, ib_event))
		return -EINVAL;

	if (cma_disable_callback(listen_id, RDMA_CM_LISTEN))
		return -ECONNABORTED;

	memset(&event, 0, sizeof event);
	offset = cma_user_data_offset(listen_id);
	event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
	if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED) {
		conn_id = cma_new_udp_id(&listen_id->id, ib_event);
		event.param.ud.private_data = ib_event->private_data + offset;
		event.param.ud.private_data_len =
				IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
	} else {
		conn_id = cma_new_conn_id(&listen_id->id, ib_event);
		cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
				       ib_event->private_data, offset);
	}
	if (!conn_id) {
		ret = -ENOMEM;
		goto err1;
	}

	mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
	ret = cma_acquire_dev(conn_id, listen_id);
	if (ret)
		goto err2;

	conn_id->cm_id.ib = cm_id;
	cm_id->context = conn_id;
	cm_id->cm_handler = cma_ib_handler;

	/*
	 * Protect against the user destroying conn_id from another thread
	 * until we're done accessing it.
	 */
	atomic_inc(&conn_id->refcount);
 	ret = conn_id->id.event_handler(&conn_id->id, &event);
 	if (ret)
 		goto err3;
 	/*
 	 * Acquire mutex to prevent user executing rdma_destroy_id()
 	 * while we're accessing the cm_id.
 	 */
 	mutex_lock(&lock);
 	if (cma_comp(conn_id, RDMA_CM_CONNECT) &&
 	    (conn_id->id.qp_type != IB_QPT_UD))
 		ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
	mutex_unlock(&lock);
	mutex_unlock(&conn_id->handler_mutex);
	mutex_unlock(&listen_id->handler_mutex);
	cma_deref_id(conn_id);
	return 0;

err3:
	cma_deref_id(conn_id);
	/* Destroy the CM ID by returning a non-zero value. */
	conn_id->cm_id.ib = NULL;
err2:
	cma_exch(conn_id, RDMA_CM_DESTROYING);
	mutex_unlock(&conn_id->handler_mutex);
err1:
	mutex_unlock(&listen_id->handler_mutex);
	if (conn_id)
		rdma_destroy_id(&conn_id->id);
	return ret;
}

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.