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ALSA: ac97: Fix possible NULL dereference in snd_ac97_mixer

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[ Upstream commit 79597c8bf6 ]

smatch error:
sound/pci/ac97/ac97_codec.c:2354 snd_ac97_mixer() error:
we previously assumed 'rac97' could be null (see line 2072)

remove redundant assignment, return error if rac97 is NULL.

Fixes: da3cec35dd ("ALSA: Kill snd_assert() in sound/pci/*")
Signed-off-by: Su Hui <suhui@nfschina.com>
Link: https://lore.kernel.org/r/20230615021732.1972194-1-suhui@nfschina.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Su Hui 2023-06-15 10:17:32 +08:00 committed by Greg Kroah-Hartman
parent 7200d1e8d8
commit 809af7bb42
1 changed files with 2 additions and 2 deletions
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4
sound/pci/ac97/ac97_codec.c
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@ -2026,8 +2026,8 @@ int snd_ac97_mixer(struct snd_ac97_bus *bus, struct snd_ac97_template *template,
.dev_disconnect = snd_ac97_dev_disconnect,
};
if (rac97)
*rac97 = NULL;
if (!rac97)
return -EINVAL;
if (snd_BUG_ON(!bus || !template))
return -EINVAL;
if (snd_BUG_ON(template->num >= 4))