linux-kernel - Re: [PATCH] drm/edid: Fix crash with zero/invalid EDID

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Message-ID: <CAD=FV=UD0BN55DCCRdFqpvsh9bCnKx0hpoc=5Fqc1F9qDXbyjA@mail.gmail.com>
Date:   Tue, 5 Oct 2021 19:20:00 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Ville Syrjälä <ville.syrjala@...ux.intel.com>
Cc:     dri-devel <dri-devel@...ts.freedesktop.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        kernel test robot <oliver.sang@...el.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Jani Nikula <jani.nikula@...el.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Sam Ravnborg <sam@...nborg.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/edid: Fix crash with zero/invalid EDID

Hi,

On Tue, Oct 5, 2021 at 9:43 AM Ville Syrjälä
<ville.syrjala@...ux.intel.com> wrote:
>
> On Mon, Oct 04, 2021 at 09:21:27AM -0700, Douglas Anderson wrote:
> > In the commit bac9c2948224 ("drm/edid: Break out reading block 0 of
> > the EDID") I broke out reading the base block of the EDID to its own
> > function. Unfortunately, when I did that I messed up the handling when
> > drm_edid_is_zero() indicated that we had an EDID that was all 0x00 or
> > when we went through 4 loops and didn't get a valid EDID. Specifically
> > I needed to pass the broken EDID to connector_bad_edid() but now I was
> > passing an error-pointer.
> >
> > Let's re-jigger things so we can pass the bad EDID in properly.
> >
> > Fixes: bac9c2948224 ("drm/edid: Break out reading block 0 of the EDID")
> > Reported-by: kernel test robot <oliver.sang@...el.com>
> > Reported-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> > Signed-off-by: Douglas Anderson <dianders@...omium.org>
>
> A bit of historical fallout zone this part of the code. So
> not the easiest thing to read in general. But looks like what
> you have here should work.
>
> Reviewed-by: Ville Syrjälä <ville.syrjala@...ux.intel.com>

Thanks! Pushed to drm-misc/drm-misc-next:

e7bd95a7ed4e drm/edid: Fix crash with zero/invalid EDID