scsi: core: Handle devices which return an unusually large VPD page count

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/[email protected]
Fixes: b5fc07a5fb56 ("scsi: core: Consult supported VPD page list prior to fetching page")
Cc: [email protected]
Reported-by: Peter Schneider <[email protected]>
Closes: https://lore.kernel.org/all/[email protected]/
Tested-by: Peter Schneider <[email protected]>
Reviewed-by: Bart Van Assche <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

0 files changed, 0 insertions, 0 deletions