linux-kernel - Re: [PATCH] fbdev: controlfb: Add missing modes to fix out of bounds access

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Date:   Thu, 09 Nov 2017 17:11:42 +0100
From:   Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Dan Carpenter <dan.carpenter@...cle.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        linux-fbdev@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fbdev: controlfb: Add missing modes to fix out of
 bounds access

On Tuesday, November 07, 2017 03:05:05 PM Geert Uytterhoeven wrote:
> Dan's static analysis says:
> 
>     drivers/video/fbdev/controlfb.c:560 control_setup()
>     error: buffer overflow 'control_mac_modes' 20 <= 21
> 
> Indeed, control_mac_modes[] has only 20 elements, while VMODE_MAX is 22,
> which may lead to an out of bounds read when parsing vmode commandline
> options.
> 
> The bug was introduced in v2.4.5.6, when 2 new modes were added to
> macmodes.h, but control_mac_modes[] wasn't updated:
> 
> https://kernel.opensuse.org/cgit/kernel/diff/include/video/macmodes.h?h=v2.5.2&id=29f279c764808560eaceb88fef36cbc35c529aad
> 
> Augment control_mac_modes[] with the two new video modes to fix this.
> 
> Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>

Patch queued for 4.15, thanks.

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