linux-kernel - Re: [PATCH v3 2/2] drm/sun4i: tcon: prevent tcon->panel dereference if NULL

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Date:   Mon, 05 Nov 2018 21:23:08 +0800
From:   Icenowy Zheng <icenowy@...c.io>
To:     Maxime Ripard <maxime.ripard@...tlin.com>,
        Giulio Benetti <giulio.benetti@...ronovasrl.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 v3 2/2] drm/sun4i: tcon: prevent tcon->panel dereference
 if NULL

在 2018-10-08一的 11:21 +0200，Maxime Ripard写道：
> On Fri, Oct 05, 2018 at 11:59:51PM +0200, Giulio Benetti wrote:
> > If tcon->panel pointer is NULL, trying to dereference from it
> > (i.e. tcon->panel->connector) will cause a null pointer
> > dereference.
> > 
> > Add tcon->panel null pointer check before calling
> > sun4i_tcon0_mode_set_dithering().
> > 
> > Signed-off-by: Giulio Benetti <giulio.benetti@...ronovasrl.com>
> > Fixes: f11adcecbd5f ("drm/sun4i: tcon: Add dithering support for
> >                       RGB565/RGB666 LCD panels")
> > Reviewed-by: Chen-Yu Tsai <wens@...e.org>
> 
> Applied both, thanks!

Please bring them to 4.20.

Currently in 4.20-rc1, bridge support of sun4i-drm is broken because of
this problem.

> Maxime
> 
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> linux-arm-kernel@...ts.infradead.org
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