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scsi: core: Improve scsi_vpd_inquiry() checks

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Some USB-SATA adapters have broken behavior when an unsupported VPD page is
probed: Depending on the VPD page number, a 4-byte header with a valid VPD
page number but with a 0 length is returned. Currently, scsi_vpd_inquiry()
only checks that the page number is valid to determine if the page is
valid, which results in receiving only the 4-byte header for the
non-existent page. This error manifests itself very often with page 0xb9
for the Concurrent Positioning Ranges detection done by sd_read_cpr(),
resulting in the following error message:

sd 0:0:0:0: [sda] Invalid Concurrent Positioning Ranges VPD page

Prevent such misleading error message by adding a check in
scsi_vpd_inquiry() to verify that the page length is not 0.

Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Link: https://lore.kernel.org/r/20230322022211.116327-1-damien.lemoal@opensource.wdc.com
Reviewed-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Damien Le Moal 2023-03-22 11:22:11 +09:00 committed by Martin K. Petersen
parent 2309df2711
commit f0aa59a33d
1 changed files with 9 additions and 2 deletions
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11
drivers/scsi/scsi.c
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@ -314,11 +314,18 @@ static int scsi_vpd_inquiry(struct scsi_device *sdev, unsigned char *buffer,
if (result)
return -EIO;
/* Sanity check that we got the page back that we asked for */
/*
* Sanity check that we got the page back that we asked for and that
* the page size is not 0.
*/
if (buffer[1] != page)
return -EIO;
return get_unaligned_be16(&buffer[2]) + 4;
result = get_unaligned_be16(&buffer[2]);
if (!result)
return -EIO;
return result + 4;
}
static int scsi_get_vpd_size(struct scsi_device *sdev, u8 page)