static void cm_recv_handler(struct ib_mad_agent *mad_agent,
			    struct ib_mad_recv_wc *mad_recv_wc)
{
	struct cm_port *port = mad_agent->context;
	struct cm_work *work;
	enum ib_cm_event_type event;
	u16 attr_id;
	int paths = 0;

	switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
	case CM_REQ_ATTR_ID:
		paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
						    alt_local_lid != 0);
		event = IB_CM_REQ_RECEIVED;
		break;
	case CM_MRA_ATTR_ID:
		event = IB_CM_MRA_RECEIVED;
		break;
	case CM_REJ_ATTR_ID:
		event = IB_CM_REJ_RECEIVED;
		break;
	case CM_REP_ATTR_ID:
		event = IB_CM_REP_RECEIVED;
		break;
	case CM_RTU_ATTR_ID:
		event = IB_CM_RTU_RECEIVED;
		break;
	case CM_DREQ_ATTR_ID:
		event = IB_CM_DREQ_RECEIVED;
		break;
	case CM_DREP_ATTR_ID:
		event = IB_CM_DREP_RECEIVED;
		break;
	case CM_SIDR_REQ_ATTR_ID:
		event = IB_CM_SIDR_REQ_RECEIVED;
		break;
	case CM_SIDR_REP_ATTR_ID:
		event = IB_CM_SIDR_REP_RECEIVED;
		break;
	case CM_LAP_ATTR_ID:
		paths = 1;
		event = IB_CM_LAP_RECEIVED;
		break;
	case CM_APR_ATTR_ID:
		event = IB_CM_APR_RECEIVED;
		break;
	default:
		ib_free_recv_mad(mad_recv_wc);
		return;
	}

	attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id);
	atomic_long_inc(&port->counter_group[CM_RECV].
			counter[attr_id - CM_ATTR_ID_OFFSET]);

	work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
		       GFP_KERNEL);
	if (!work) {
		ib_free_recv_mad(mad_recv_wc);
		return;
	}

	INIT_DELAYED_WORK(&work->work, cm_work_handler);
	work->cm_event.event = event;
	work->mad_recv_wc = mad_recv_wc;
	work->port = port;
	queue_delayed_work(cm.wq, &work->work, 0);
}

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.