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Message-ID: <ddc14926-45d8-9b20-9523-0fb6afa499b3@wanadoo.fr>
Date: Wed, 23 Aug 2023 19:20:49 +0200
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: Su Hui <suhui@...china.com>, perex@...ex.cz, tiwai@...e.com
Cc: 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
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>
CJ
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