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

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Message-ID: <20181004195605.txvbkshvxklyzxyb@flea>
Date:   Thu, 4 Oct 2018 21:56:05 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Giulio Benetti <giulio.benetti@...ronovasrl.com>
Cc:     David Airlie <airlied@...ux.ie>, Chen-Yu Tsai <wens@...e.org>,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] drm/sun4i: tcon: prevent tcon->panel dereference
 if null

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?

> 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.

Maxime

-- 
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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