static int mptsas_process_scsi_io_request(MPTSASState *s,
                                          MPIMsgSCSIIORequest *scsi_io,
                                          hwaddr addr)
{
    MPTSASRequest *req;
    MPIMsgSCSIIOReply reply;
    SCSIDevice *sdev;
    int status;

    mptsas_fix_scsi_io_endianness(scsi_io);

    trace_mptsas_process_scsi_io_request(s, scsi_io->Bus, scsi_io->TargetID,
                                         scsi_io->LUN[1], scsi_io->DataLength);

    status = mptsas_scsi_device_find(s, scsi_io->Bus, scsi_io->TargetID,
                                     scsi_io->LUN, &sdev);
    if (status) {
         goto bad;
     }
 
    req = g_new0(MPTSASRequest, 1);
     QTAILQ_INSERT_TAIL(&s->pending, req, next);
     req->scsi_io = *scsi_io;
     req->dev = s;

    status = mptsas_build_sgl(s, req, addr);
    if (status) {
        goto free_bad;
    }

    if (req->qsg.size < scsi_io->DataLength) {
        trace_mptsas_sgl_overflow(s, scsi_io->MsgContext, scsi_io->DataLength,
                                  req->qsg.size);
        status = MPI_IOCSTATUS_INVALID_SGL;
        goto free_bad;
    }

    req->sreq = scsi_req_new(sdev, scsi_io->MsgContext,
                            scsi_io->LUN[1], scsi_io->CDB, req);

    if (req->sreq->cmd.xfer > scsi_io->DataLength) {
        goto overrun;
    }
    switch (scsi_io->Control & MPI_SCSIIO_CONTROL_DATADIRECTION_MASK) {
    case MPI_SCSIIO_CONTROL_NODATATRANSFER:
        if (req->sreq->cmd.mode != SCSI_XFER_NONE) {
            goto overrun;
        }
        break;

    case MPI_SCSIIO_CONTROL_WRITE:
        if (req->sreq->cmd.mode != SCSI_XFER_TO_DEV) {
            goto overrun;
        }
        break;

    case MPI_SCSIIO_CONTROL_READ:
        if (req->sreq->cmd.mode != SCSI_XFER_FROM_DEV) {
            goto overrun;
        }
        break;
    }

    if (scsi_req_enqueue(req->sreq)) {
        scsi_req_continue(req->sreq);
    }
    return 0;

overrun:
    trace_mptsas_scsi_overflow(s, scsi_io->MsgContext, req->sreq->cmd.xfer,
                               scsi_io->DataLength);
    status = MPI_IOCSTATUS_SCSI_DATA_OVERRUN;
free_bad:
    mptsas_free_request(req);
bad:
    memset(&reply, 0, sizeof(reply));
    reply.TargetID          = scsi_io->TargetID;
    reply.Bus               = scsi_io->Bus;
    reply.MsgLength         = sizeof(reply) / 4;
    reply.Function          = scsi_io->Function;
    reply.CDBLength         = scsi_io->CDBLength;
    reply.SenseBufferLength = scsi_io->SenseBufferLength;
    reply.MsgContext        = scsi_io->MsgContext;
    reply.SCSIState         = MPI_SCSI_STATE_NO_SCSI_STATUS;
    reply.IOCStatus         = status;

    mptsas_fix_scsi_io_reply_endianness(&reply);
    mptsas_reply(s, (MPIDefaultReply *)&reply);

    return 0;
}

The product writes data past the end, or before the beginning, of the intended buffer.