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

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Date:	Wed, 17 Feb 2016 10:40:41 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Takashi Iwai <tiwai@...e.de>, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org, Jaroslav Kysela <perex@...ex.cz>,
	Mark Brown <broonie@...nel.org>,
	David Henningsson <david.henningsson@...onical.com>,
	Han Lu <han.lu@...el.com>,
	Libin Yang <libin.yang@...ux.intel.com>,
	Thierry Reding <treding@...dia.com>
Subject: Re: [PATCH] sound: hdmi: avoid dereferencing uninitialized 'jack' pointer

On Wednesday 17 February 2016 10:35:40 Takashi Iwai wrote:
> From: Takashi Iwai <tiwai@...e.de>
> Subject: [PATCH v2] ALSA: jack: Allow building the jack layer without
>  input device
> 
> Since the recent integration of kctl jack and input jack layers, we
> can basically build the jack layer even without input devices.  That
> is, the jack layer itself can be built with conditional to enable the
> input device support or not, while the users may enable always
> CONFIG_SND_JACK unconditionally.
> 
> For achieving it, this patch changes the following:
> - A new Kconfig, CONFIG_SND_JACK_INPUT_DEV, was introduced to indicate
>   whether the jack layer supports the input device,
> - A few items in snd_jack struct and relevant codes are conditionally
>   built upon CONFIG_SND_JACK_INPUT_DEV,
> - The users of CONFIG_SND_JACK drop the messy dependency on
>   CONFIG_INPUT.
> 
> This change also automagically fixes a potential bug in HD-audio
> driver Arnd reported, where the NULL or uninitialized jack instance is
> dereferenced.
> 
> Reported-by: Arnd Bergmann <arnd@...db.de>
> Signed-off-by: Takashi Iwai <tiwai@...e.de>
> 

Looks great, that indeed takes care of the issue I reported and
makes the code more useful and more robust overall.

Acked-by: Arnd Bergmann <arnd@...db.de>