Kefeng Wang <wangkefeng.wang@xxxxxxxxxx> writes: Kefeng, > root@localhost ~]# sg_modes -p 0x2a /dev/sr0 > QEMU QEMU DVD-ROM 0.15 peripheral_type: cd/dvd [0x5] > Mode parameter header from MODE SENSE(10): > Invalid block descriptor length=512, ignore > Mode data length=36, medium type=0x70, specific param=0x00, longlba=0 > Block descriptor length=0 >>> MM capabilities and mechanical status (obsolete), page_control: current > 00 2a 12 00 00 71 60 29 00 02 c2 00 02 02 00 02 c2 > 10 00 00 00 00 > Unexpectedly received extra mode page responses, ignore That looks pretty broken. Could you try the following patch? Thanks! -- Martin K. Petersen Oracle Linux Engineering diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index f41e6b84a1bd..51a4ce094450 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -2485,6 +2485,10 @@ scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage, goto retry; } + if (data->length > len || + data->header_length + data->block_descriptor_length > data->length) + return 0; + return result; } EXPORT_SYMBOL(scsi_mode_sense);
