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| author | Takashi Iwai <tiwai@suse.de> | 2020-06-16 15:09:21 +0300 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2020-06-17 11:08:12 +0300 |
| commit | ff58bbc7b9704a5869204176f804eff57307fef0 (patch) | |
| tree | 6c7a236d00a9dff28e3d78123bf40b6c2c73e302 | |
| parent | a0b03952a797591d4b6d6fa7b9b7872e27783729 (diff) | |
| download | linux-ff58bbc7b9704a5869204176f804eff57307fef0.tar.xz | |
ALSA: usb-audio: Fix potential use-after-free of streams
With the recent full-duplex support of implicit feedback streams, an
endpoint can be still running after closing the capture stream as long
as the playback stream with the sync-endpoint is running. In such a
state, the URBs are still be handled and they may call retire_data_urb
callback, which tries to transfer the data from the PCM buffer. Since
the PCM stream gets closed, this may lead to use-after-free.
This patch adds the proper clearance of the callback at stopping the
capture stream for addressing the possible UAF above.
Fixes: 10ce77e4817f ("ALSA: usb-audio: Add duplex sound support for USB devices using implicit feedback")
Link: https://lore.kernel.org/r/20200616120921.12249-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
| -rw-r--r-- | sound/usb/pcm.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c index 84c0ae431936..a777d36c4f5a 100644 --- a/sound/usb/pcm.c +++ b/sound/usb/pcm.c @@ -1787,6 +1787,7 @@ static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream return 0; case SNDRV_PCM_TRIGGER_STOP: stop_endpoints(subs); + subs->data_endpoint->retire_data_urb = NULL; subs->running = 0; return 0; case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |