static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg,
			   void *file)
{
	struct comedi_subdevice *s;

	if (arg >= dev->n_subdevices)
		return -EINVAL;
	s = dev->subdevices + arg;

	if (s->busy)
		return -EBUSY;

	if (s->lock && s->lock != file)
		return -EACCES;

	if (s->lock == file) {
#if 0
		if (s->unlock)
			s->unlock(dev, s);
#endif

		s->lock = NULL;
	}

	return 0;
}

The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.