Re: [PATCH] vgacon: Prevent faulty bootparams.screeninfo from causing harm

On Sunday, August 27, 2017 08:23:29 PM Jan H. Schönherr wrote:

If a zero for the number of colums or rows manages to slip through,
gotoxy() will underflow vc->vc_pos, causing the next action on the
referenced memory to end with a page fault.

Make the check in vgacon_startup() more pessimistic to prevent that.

Signed-off-by: Jan H. Schönherr <redacted>

Patch queued for 4.14, thanks.

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics