static struct cm_id_private * cm_match_req(struct cm_work *work,
					   struct cm_id_private *cm_id_priv)
{
	struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
	struct cm_timewait_info *timewait_info;
	struct cm_req_msg *req_msg;

	req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;

	/* Check for possible duplicate REQ. */
	spin_lock_irq(&cm.lock);
	timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
	if (timewait_info) {
		cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
					   timewait_info->work.remote_id);
		spin_unlock_irq(&cm.lock);
		if (cur_cm_id_priv) {
			cm_dup_req_handler(work, cur_cm_id_priv);
			cm_deref_id(cur_cm_id_priv);
		}
		return NULL;
	}

	/* Check for stale connections. */
	timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
	if (timewait_info) {
		cm_cleanup_timewait(cm_id_priv->timewait_info);
		spin_unlock_irq(&cm.lock);
		cm_issue_rej(work->port, work->mad_recv_wc,
			     IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
			     NULL, 0);
		return NULL;
	}

	/* Find matching listen request. */
	listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
					   req_msg->service_id,
					   req_msg->private_data);
	if (!listen_cm_id_priv) {
		cm_cleanup_timewait(cm_id_priv->timewait_info);
		spin_unlock_irq(&cm.lock);
		cm_issue_rej(work->port, work->mad_recv_wc,
			     IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
			     NULL, 0);
		goto out;
	}
	atomic_inc(&listen_cm_id_priv->refcount);
	atomic_inc(&cm_id_priv->refcount);
	cm_id_priv->id.state = IB_CM_REQ_RCVD;
	atomic_inc(&cm_id_priv->work_count);
	spin_unlock_irq(&cm.lock);
out:
	return listen_cm_id_priv;
}

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.