linux-kernel - Re: [PATCH v2 2/2] drm/sun4i: tcon: prevent tcon->panel dereference if null

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Date:   Fri, 5 Oct 2018 23:38:06 +0200
From:   Giulio Benetti <giulio.benetti@...ronovasrl.com>
To:     Maxime Ripard <maxime.ripard@...tlin.com>
Cc:     David Airlie <airlied@...ux.ie>, Chen-Yu Tsai <wens@...e.org>,
        linux-arm-kernel@...ts.infradead.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] drm/sun4i: tcon: prevent tcon->panel dereference
 if null

Hi,

Il 04/10/2018 21:56, Maxime Ripard ha scritto:
> On Wed, Oct 03, 2018 at 04:24:58PM +0200, Giulio Benetti wrote:
>> If using tcon with VGA,
> 
> We don't have support for VGA at the moment. Or are you talking about
> using a VGA bridge?

You're right, in general VGA is not the point.
tcon->panel is retrieved by drm_of_find_panel_or_bridge() and panel can 
be present or not.

>> tcon->panel will be null(0), this will cause segmentation fault when
>> trying to dereference tcon->panel->connector.
> 
> It's not a segmentation fault, but a null pointer dereference. And
> that case will also happen with bridges.

Right.

Going to improve/rewrite commit logs and submit v2 patchset.

Thanks for reviewing.

Best regards
-- 
Giulio Benetti
CTO

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