Re: [PATCH] ALSA: usx2y: us144mkii: fix work UAF on disconnect

[Takashi Iwai]

On Wed, 01 Jul 2026 11:52:31 +0200,
HyeongJun An wrote:
> 
> tascam_disconnect() cancels capture_work and midi_in_work before
> usb_kill_anchored_urbs() kills the capture/MIDI-in URBs.  Those URBs
> self-resubmit, and their completion handlers reschedule the work.
> 
> A URB that completes in the small window between cancel_work_sync() and
> usb_kill_anchored_urbs() therefore re-arms the work after its only
> cancel.  Nothing cancels it again before snd_card_free() frees the
> card-private tascam structure, so the work handler then runs on freed
> memory.
> 
> Kill the anchored URBs before cancelling the work; once the work is
> cancelled no remaining URB can complete to re-arm it.
> 
> Fixes: c1bb0c13e430 ("ALSA: usb-audio: us144mkii: Implement audio capture and decoding")
> Cc: stable@xxxxxxxxxxxxxxx
> Assisted-by: Claude:claude-opus-4-8
> Signed-off-by: HyeongJun An <sammiee5311@xxxxxxxxx>

Applied now.  Thanks.


Takashi