linux-kernel - Re: [PATCH v2] drm/fb-helper: add virtual screen size check to drm_fb_helper_check

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Message-ID: <CAMuHMdXSnHJpy=27pkAfQC0v+tkpx7Q4Ze1=nvTmy+aMBeVPFg@mail.gmail.com>
Date:   Thu, 11 Aug 2022 16:54:16 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Andrey Strachuk <strochuk@...ras.ru>
Cc:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, Helge Deller <deller@....de>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ldv-project@...uxtesting.org
Subject: Re: [PATCH v2] drm/fb-helper: add virtual screen size check to drm_fb_helper_check_var()

Hi Andrey,

On Thu, Aug 11, 2022 at 4:49 PM Andrey Strachuk <strochuk@...ras.ru> wrote:
> Add virtual screen size check to drm_fb_helper_check_var() in
> order to validate userspace input.
>
> Found by Linux Verification Center (linuxtesting.org) with syzkaller.
>
> Signed-off-by: Andrey Strachuk <strochuk@...ras.ru>

Thanks for the update!

> Fixes: 785b93ef8c30 ("drm/kms: move driver specific fb common code to helper functions (v2)")

I'd drop the Fixes tag completely, as the bug was present in the
intel and radeon drivers before. But probably it doesn't matter, as no one
is gonna backport this to v2.6.31 and earlier ;-)

Reviewed-by: Geert Uytterhoeven <geert@...ux-m68k.org>

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds