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

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Date:   Wed, 23 Aug 2023 10:52:13 +0800
From:   Su Hui <suhui@...china.com>
To:     perex@...ex.cz, tiwai@...e.com,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     suhui@...china.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: [PATCH] ALSA: ac97: Fix possible error value of *rac97

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])
-- 
2.30.2