static void cm_dup_req_handler(struct cm_work *work,
			       struct cm_id_private *cm_id_priv)
{
	struct ib_mad_send_buf *msg = NULL;
	int ret;

	atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
			counter[CM_REQ_COUNTER]);

	/* Quick state check to discard duplicate REQs. */
	if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
		return;

	ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
	if (ret)
		return;

	spin_lock_irq(&cm_id_priv->lock);
	switch (cm_id_priv->id.state) {
	case IB_CM_MRA_REQ_SENT:
		cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
			      CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
			      cm_id_priv->private_data,
			      cm_id_priv->private_data_len);
		break;
	case IB_CM_TIMEWAIT:
		cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
			      IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
		break;
	default:
		goto unlock;
	}
	spin_unlock_irq(&cm_id_priv->lock);

	ret = ib_post_send_mad(msg, NULL);
	if (ret)
		goto free;
	return;

unlock:	spin_unlock_irq(&cm_id_priv->lock);
free:	cm_free_msg(msg);
}

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.