6.6-stable review patch. If anyone has any objections, please let me know.
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From: Martin K. Petersen martin.petersen@oracle.com
commit d09c05aa35909adb7d29f92f0cd79fdcd1338ef0 upstream.
Peter Schneider reported that a system would no longer boot after updating to 6.8.4. Peter bisected the issue and identified commit b5fc07a5fb56 ("scsi: core: Consult supported VPD page list prior to fetching page") as being the culprit.
Turns out the enclosure device in Peter's system reports a byteswapped page length for VPD page 0. It reports "02 00" as page length instead of "00 02". This causes us to attempt to access 516 bytes (page length + header) of information despite only 2 pages being present.
Limit the page search scope to the size of our VPD buffer to guard against devices returning a larger page count than requested.
Link: https://lore.kernel.org/r/20240521023040.2703884-1-martin.petersen@oracle.co... Fixes: b5fc07a5fb56 ("scsi: core: Consult supported VPD page list prior to fetching page") Cc: stable@vger.kernel.org Reported-by: Peter Schneider pschneider1968@googlemail.com Closes: https://lore.kernel.org/all/eec6ebbf-061b-4a7b-96dc-ea748aa4d035@googlemail.... Tested-by: Peter Schneider pschneider1968@googlemail.com Reviewed-by: Bart Van Assche bvanassche@acm.org Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/scsi/scsi.c | 7 +++++++ 1 file changed, 7 insertions(+)
--- a/drivers/scsi/scsi.c +++ b/drivers/scsi/scsi.c @@ -350,6 +350,13 @@ static int scsi_get_vpd_size(struct scsi if (result < SCSI_VPD_HEADER_SIZE) return 0;
+ if (result > sizeof(vpd)) { + dev_warn_once(&sdev->sdev_gendev, + "%s: long VPD page 0 length: %d bytes\n", + __func__, result); + result = sizeof(vpd); + } + result -= SCSI_VPD_HEADER_SIZE; if (!memchr(&vpd[SCSI_VPD_HEADER_SIZE], page, result)) return 0;