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From: Sam Ravnborg <sam@ravnborg.org>
To: Daniel Vetter <daniel.vetter@ffwll.ch>
Subject: Re: [PATCH 05/21] fbcon: Introduce wrapper for console->fb_info lookup
Message-ID: <YfxIYAKE1RIVUT+9@ravnborg.org>
References: <20220131210552.482606-1-daniel.vetter@ffwll.ch>
 <20220131210552.482606-6-daniel.vetter@ffwll.ch>
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Cc: linux-fbdev@vger.kernel.org, Du Cheng <ducheng2@gmail.com>,
 Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
 Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
 Intel Graphics Development <intel-gfx@lists.freedesktop.org>,
 LKML <linux-kernel@vger.kernel.org>,
 DRI Development <dri-devel@lists.freedesktop.org>,
 Claudio Suarez <cssk@net-c.es>, Thomas Zimmermann <tzimmermann@suse.de>,
 Daniel Vetter <daniel.vetter@intel.com>, Helge Deller <deller@gmx.de>
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On Mon, Jan 31, 2022 at 10:05:36PM +0100, Daniel Vetter wrote:
> Half of it is protected by console_lock, but the other half is a lot
> more awkward: Registration/deregistration of fbdev are serialized, but
> we don't really clear out anything in con2fb_map and so there's
> potential for use-after free mixups.
> 
> First step is to encapsulate the lookup.
> 
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> Cc: Helge Deller <deller@gmx.de>
> Cc: Daniel Vetter <daniel@ffwll.ch>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
> Cc: Du Cheng <ducheng2@gmail.com>
> Cc: Claudio Suarez <cssk@net-c.es>
> Cc: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Sam Ravnborg <sam@ravnborg.org>