linux-kernel - Re: [PATCH] ALSA: ac97: Fix possible error value of *rac97

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Date:   Thu, 24 Aug 2023 10:02:44 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Su Hui <suhui@...china.com>
Cc:     Christophe JAILLET <christophe.jaillet@...adoo.fr>, perex@...ex.cz,
        tiwai@...e.com, arnd@...db.de, robert.jarzmik@...e.fr,
        yangyingliang@...wei.com, maciej.szmigiero@...cle.com,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] ALSA: ac97: Fix possible error value of *rac97

On Wed, 23 Aug 2023 19:20:49 +0200,
Christophe JAILLET wrote:
> 
> Le 23/08/2023 à 04:52, Su Hui a écrit :
> > Before committing 79597c8bf64c, *rac97 always be NULL if there is
> > an error. When error happens, make sure *rac97 is NULL is safer.
> > 
> > For examble, in snd_vortex_mixer():
> > 	err = snd_ac97_mixer(pbus, &ac97, &vortex->codec);
> > 	vortex->isquad = ((vortex->codec == NULL) ?
> > 		0 : (vortex->codec->ext_id&0x80));
> > If error happened but vortex->codec isn't NULL, this may cause some
> > problems.
> > 
> > Move the judgement order to be clearer and better.
> > 
> > Fixes: 79597c8bf64c ("ALSA: ac97: Fix possible NULL dereference in snd_ac97_mixer")
> > Suggested-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> > Signed-off-by: Su Hui <suhui@...china.com>
> > ---
> >   sound/pci/ac97/ac97_codec.c | 5 ++---
> >   1 file changed, 2 insertions(+), 3 deletions(-)
> > 
> > diff --git a/sound/pci/ac97/ac97_codec.c b/sound/pci/ac97/ac97_codec.c
> > index 80a65b8ad7b9..25f93e56cfc7 100644
> > --- a/sound/pci/ac97/ac97_codec.c
> > +++ b/sound/pci/ac97/ac97_codec.c
> > @@ -2069,10 +2069,9 @@ int snd_ac97_mixer(struct snd_ac97_bus *bus, struct snd_ac97_template *template,
> >   		.dev_disconnect =	snd_ac97_dev_disconnect,
> >   	};
> >   -	if (!rac97)
> > -		return -EINVAL;
> > -	if (snd_BUG_ON(!bus || !template))
> > +	if (snd_BUG_ON(!bus || !template || !rac97))
> >   		return -EINVAL;
> > +	*rac97 = NULL;
> >   	if (snd_BUG_ON(template->num >= 4))
> >   		return -EINVAL;
> >   	if (bus->codec[template->num])
> 
> FWIW,
> 
> Acked-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>

Applied now, thanks.


Takashi