[PATCH 5.10 07/86] ALSA: usb-audio: Clear MIDI port active flag after draining

Greg Kroah-Hartman
2022-04-26T09:17:21Z

From: Takashi Iwai <tiwai@suse.de>

commit 0665886ad1392e6b5bae85d7a6ccbed48dca1522 upstream.

When a rawmidi output stream is closed, it calls the drain at first,
then does trigger-off only when the drain returns -ERESTARTSYS as a
fallback. It implies that each driver should turn off the stream
properly after the drain. Meanwhile, USB-audio MIDI interface didn't
change the port->active flag after the drain. This may leave the
output work picking up the port that is closed right now, which
eventually leads to a use-after-free for the already released rawmidi
object.

This patch fixes the bug by properly clearing the port->active flag
after the output drain.

Reported-by: syzbot+70e777a39907d6d5fd0a@syzkaller.appspotmail.com
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/00000000000011555605dceaff03@google.com
Link: https://lore.kernel.org/r/20220420130247.22062-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
sound/usb/midi.c | 1 +
1 file changed, 1 insertion(+)

--- a/sound/usb/midi.c
+++ b/sound/usb/midi.c
@@ -1210,6 +1210,7 @@ static void snd_usbmidi_output_drain(str
} while (drain_urbs && timeout);
finish_wait(&ep->drain_wait, &wait);
}
+ port->active = 0;
spin_unlock_irq(&ep->buffer_lock);
}