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[RFC,5/6] ALSA: control: Reference card by ctl_dev

Message ID 20230807135207.17708-7-tiwai@suse.de
State New
Headers show
Series ALSA: Fix UAF with delayed kobj release | expand

Commit Message

Takashi Iwai Aug. 7, 2023, 1:52 p.m. UTC 
Add the reference to the card object at control device
initialization.  This fixes the potential UAF by the delayed kobj
release.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 sound/core/control.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/sound/core/control.c b/sound/core/control.c
index 5b9340f5cb8c..7ac077b57709 100644
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -2395,7 +2395,7 @@  int snd_ctl_create(struct snd_card *card)
 	if (snd_BUG_ON(card->number < 0 || card->number >= SNDRV_CARDS))
 		return -ENXIO;
 
-	snd_device_initialize(&card->ctl_dev, card, NULL);
+	snd_device_initialize(&card->ctl_dev, card, card);
 	dev_set_name(&card->ctl_dev, "controlC%d", card->number);
 
 	err = snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops);