media: cec: forgot to cancel delayed work

commit 490d84f upstream.

If the wait for completion was interrupted, then make sure to cancel
any delayed work.

This can only happen if a transmit is waiting for a reply, and you press
Ctrl-C or reboot/poweroff or something like that which interrupts the
thread waiting for the reply and then proceeds to delete the CEC message.

Since the delayed work wasn't canceled, once it would trigger it referred
to stale data and resulted in a kernel oops.

Fixes: 7ec2b3b ("cec: add new tx/rx status bits to detect aborts/timeouts")

Signed-off-by: Hans Verkuil <[email protected]>
Cc: <[email protected]>      # for v4.18 and up
Signed-off-by: Mauro Carvalho Chehab <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: hverkuil

drivers/media/cec/cec-adap.c

@@ -831,6 +831,8 @@ int cec_transmit_msg_fh(struct cec_adapter *adap, struct cec_msg *msg,
 	 */
 	mutex_unlock(&adap->lock);
 	wait_for_completion_killable(&data->c);
+	if (!data->completed)
+		cancel_delayed_work_sync(&data->work);
 	mutex_lock(&adap->lock);
 
 	/* Cancel the transmit if it was interrupted */