static int cm_dreq_handler(struct cm_work *work)
{
	struct cm_id_private *cm_id_priv;
	struct cm_dreq_msg *dreq_msg;
	struct ib_mad_send_buf *msg = NULL;
	int ret;

	dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
	cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
				   dreq_msg->local_comm_id);
	if (!cm_id_priv) {
		atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
				counter[CM_DREQ_COUNTER]);
		cm_issue_drep(work->port, work->mad_recv_wc);
		return -EINVAL;
	}

	work->cm_event.private_data = &dreq_msg->private_data;

	spin_lock_irq(&cm_id_priv->lock);
	if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
		goto unlock;

	switch (cm_id_priv->id.state) {
	case IB_CM_REP_SENT:
	case IB_CM_DREQ_SENT:
		ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
		break;
	case IB_CM_ESTABLISHED:
		if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
		    cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
			ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
		break;
	case IB_CM_MRA_REP_RCVD:
		break;
	case IB_CM_TIMEWAIT:
		atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
				counter[CM_DREQ_COUNTER]);
		if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
			goto unlock;

		cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
			       cm_id_priv->private_data,
			       cm_id_priv->private_data_len);
		spin_unlock_irq(&cm_id_priv->lock);

		if (ib_post_send_mad(msg, NULL))
			cm_free_msg(msg);
		goto deref;
	case IB_CM_DREQ_RCVD:
		atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
				counter[CM_DREQ_COUNTER]);
		goto unlock;
	default:
		goto unlock;
	}
	cm_id_priv->id.state = IB_CM_DREQ_RCVD;
	cm_id_priv->tid = dreq_msg->hdr.tid;
	ret = atomic_inc_and_test(&cm_id_priv->work_count);
	if (!ret)
		list_add_tail(&work->list, &cm_id_priv->work_list);
	spin_unlock_irq(&cm_id_priv->lock);

	if (ret)
		cm_process_work(cm_id_priv, work);
	else
		cm_deref_id(cm_id_priv);
	return 0;

unlock:	spin_unlock_irq(&cm_id_priv->lock);
deref:	cm_deref_id(cm_id_priv);
	return -EINVAL;
}

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.