From: Arnd Bergmann <arnd@arndb.de>
To: linux-arm-kernel@lists.infradead.org
Cc: alsa-devel@alsa-project.org, Takashi Iwai <tiwai@suse.de>,
linux-kernel@vger.kernel.org, Jaroslav Kysela <perex@perex.cz>,
Mark Brown <broonie@kernel.org>, Han Lu <han.lu@intel.com>,
Libin Yang <libin.yang@linux.intel.com>,
Thierry Reding <treding@nvidia.com>,
David Henningsson <david.henningsson@canonical.com>
Subject: Re: [PATCH] sound: hdmi: avoid dereferencing uninitialized 'jack' pointer
Date: Tue, 16 Feb 2016 18:09:11 +0100 [thread overview]
Message-ID: <12468747.ft2nGomr6c@wuerfel> (raw)
In-Reply-To: <112888486.mQgaWiH0PI@wuerfel>
On Tuesday 16 February 2016 17:59:04 Arnd Bergmann wrote:
> --- a/sound/pci/hda/hda_jack.c
> +++ b/sound/pci/hda/hda_jack.c
> @@ -403,8 +403,10 @@ int snd_hda_jack_add_kctl(struct hda_codec *codec, hda_nid_t nid,
>
> jack->phantom_jack = !!phantom_jack;
> jack->type = type;
> - jack->jack->private_data = jack;
> - jack->jack->private_free = hda_free_jack_priv;
> + if (IS_ENABLED(CONFIG_SND_JACK)) {
> + jack->jack->private_data = jack;
> + jack->jack->private_free = hda_free_jack_priv;
> + }
> state = snd_hda_jack_detect(codec, nid);
> snd_jack_report(jack->jack, state ? jack->type : 0);
>
Or another idea: if we pass private_{data,free} into snd_jack_new()
as arguments, the snd_jack structure can become private to
sound/core/jack.c, so we can be sure to never hit this bug
again.
Arnd
next prev parent reply other threads:[~2016-02-16 17:10 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-16 14:47 [PATCH] sound: hdmi: avoid dereferencing uninitialized 'jack' pointer Arnd Bergmann
2016-02-16 15:49 ` Takashi Iwai
2016-02-16 16:09 ` Arnd Bergmann
2016-02-16 16:18 ` Takashi Iwai
2016-02-16 16:38 ` Mark Brown
2016-02-16 16:43 ` Takashi Iwai
2016-02-16 16:59 ` Arnd Bergmann
2016-02-16 17:09 ` Arnd Bergmann [this message]
2016-02-16 17:10 ` Takashi Iwai
2016-02-16 17:26 ` Arnd Bergmann
2016-02-16 22:08 ` Arnd Bergmann
2016-02-17 9:03 ` Takashi Iwai
2016-02-17 9:24 ` [PATCH] ALSA: jack: Allow building the jack layer without input kbuild test robot
2016-02-17 9:35 ` [PATCH] sound: hdmi: avoid dereferencing uninitialized 'jack' pointer Takashi Iwai
2016-02-17 9:40 ` Arnd Bergmann
2016-02-24 16:18 ` Arnd Bergmann
2016-02-24 16:25 ` Takashi Iwai
2016-02-24 16:39 ` Arnd Bergmann
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