This is a note to let you know that I've just added the patch titled
ALSA: ac97: Fix possible NULL dereference in snd_ac97_mixer
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
alsa-ac97-fix-possible-null-dereference-in-snd_ac97_.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit ef191039261e6299d0524a779176e2161f7e34a6
Author: Su Hui <suhui@xxxxxxxxxxxx>
Date: Thu Jun 15 10:17:32 2023 +0800
ALSA: ac97: Fix possible NULL dereference in snd_ac97_mixer
[ Upstream commit 79597c8bf64ca99eab385115743131d260339da5 ]
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: da3cec35dd3c ("ALSA: Kill snd_assert() in sound/pci/*")
Signed-off-by: Su Hui <suhui@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230615021732.1972194-1-suhui@xxxxxxxxxxxx
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/sound/pci/ac97/ac97_codec.c b/sound/pci/ac97/ac97_codec.c
index a276c4283c7bb..3f13666a01904 100644
--- a/sound/pci/ac97/ac97_codec.c
+++ b/sound/pci/ac97/ac97_codec.c
@@ -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))
