From 6a66b01de48855d92450904ccfafda9d692efbb9 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Wed, 16 Aug 2023 18:02:45 +0200 Subject: ALSA: control: Don't embed ctl_dev Embedding the ctl_dev in the snd_card object may result in UAF when the delayed kobj release is used; at the delayed kobj release, it still accesses the struct device itself while the card memory (that embeds the struct device) may be already gone. As a workaround, detach the struct device from the card object by allocating via the new snd_device_alloc() helper. The rest are just replacing ctl_dev access to the pointer. This is based on the fix Curtis posted initially. In this patch, the changes are split and use the new helper function instead. Link: https://lore.kernel.org/r/20230801171928.1460120-1-cujomalainey@chromium.org Reviewed-by: Jaroslav Kysela Signed-off-by: Curtis Malainey Tested-by: Curtis Malainey Link: https://lore.kernel.org/r/20230816160252.23396-3-tiwai@suse.de Signed-off-by: Takashi Iwai --- sound/usb/media.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'sound/usb') diff --git a/sound/usb/media.c b/sound/usb/media.c index 840f42cb9272..6d11fedb4632 100644 --- a/sound/usb/media.c +++ b/sound/usb/media.c @@ -163,7 +163,7 @@ void snd_media_stop_pipeline(struct snd_usb_substream *subs) static int snd_media_mixer_init(struct snd_usb_audio *chip) { - struct device *ctl_dev = &chip->card->ctl_dev; + struct device *ctl_dev = chip->card->ctl_dev; struct media_intf_devnode *ctl_intf; struct usb_mixer_interface *mixer; struct media_device *mdev = chip->media_dev; -- cgit