diff options
| author | Takashi Iwai <tiwai@suse.de> | 2023-08-16 18:02:45 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2023-08-17 09:23:30 +0200 |
| commit | 6a66b01de48855d92450904ccfafda9d692efbb9 (patch) | |
| tree | fb71a8695685b90362ee203b8b281e53e31fae29 /sound/usb | |
| parent | 7f018db19bf7cb5ba3e39ed9e51c8c5f2488dfb0 (diff) | |
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 <perex@perex.cz>
Signed-off-by: Curtis Malainey <cujomalainey@chromium.org>
Tested-by: Curtis Malainey <cujomalainey@chromium.org>
Link: https://lore.kernel.org/r/20230816160252.23396-3-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb')
| -rw-r--r-- | sound/usb/media.c | 2 |
1 files changed, 1 insertions, 1 deletions
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; |