UPSTREAM: scsi: qla2xxx: Fix an integer overflow in sysfs code
The value of "size" comes from the user. When we add "start + size" it
could lead to an integer overflow bug.
It means we vmalloc() a lot more memory than we had intended. I believe
that on 64 bit systems vmalloc() can succeed even if we ask it to
allocate huge 4GB buffers. So we would get memory corruption and likely
a crash when we call ha->isp_ops->write_optrom() and ->read_optrom().
Only root can trigger this bug.
TEST=Build and run
Fixes: b7cc176c9eb3 ("[SCSI] qla2xxx: Allow region-based flash-part accesses.")
Reported-by: shqking <email@example.com>
Signed-off-by: Dan Carpenter <firstname.lastname@example.org>
Signed-off-by: Martin K. Petersen <email@example.com>
Signed-off-by: Guenter Roeck <firstname.lastname@example.org>
(cherry picked from commit e6f77540c067)
Reviewed-by: Dylan Reid <email@example.com>
1 file changed