linux-kernel - Re: [PATCH] sound: hdmi: avoid dereferencing uninitialized 'jack' pointer

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Date:	Tue, 16 Feb 2016 17:43:24 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Mark Brown <broonie@...nel.org>
Cc:	Arnd Bergmann <arnd@...db.de>,
	linux-arm-kernel@...ts.infradead.org, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org, Jaroslav Kysela <perex@...ex.cz>,
	Han Lu <han.lu@...el.com>,
	Libin Yang <libin.yang@...ux.intel.com>,
	Thierry Reding <treding@...dia.com>,
	David Henningsson <david.henningsson@...onical.com>
Subject: Re: [PATCH] sound: hdmi: avoid dereferencing uninitialized 'jack' pointer

On Tue, 16 Feb 2016 17:38:40 +0100,
Mark Brown wrote:
> 
> On Tue, Feb 16, 2016 at 05:18:29PM +0100, Takashi Iwai wrote:
> > Arnd Bergmann wrote:
> 
> > > Another option might would be to change snd_jack_new() to return
> > > an error if that SND_JACK is disabled, and then require all users
> > > to handle the error gracefully, i.e. not fail the probe() function
> > > but just not use the jack.
> 
> > Yes, I thought of that, too.  If select is no good option, it's a good
> > alternative, indeed.
> 
> It's going to be a bunch of work to implement though.

Is it?  Which driver would be broken?  Many ASoC drivers just ignore
the return error completely.  Some treats as a fatal error, and the
behavior would change, yes.  But I don't think that such a driver
would work without CONFIG_SND_JACK properly in anyway.


Takashi