Linux kernel 4.9.25: signed integer overflow in drivers/scsi/scsicam.c:173:29

Hello scsi maintainer,

I would like to report a signed integer overflow in drivers/scsi/scsicam.c:173:29 reported on the Gentoo bug reporting system.
https://bugs.gentoo.org/show_bug.cgi?id=617820

The problem looks present ,at least , in the Linux kernel 4.9.25 regards,

Alice Ferrazzi
Gentoo kernel project leader