static int dvb_usb_stop_feed(struct dvb_demux_feed *dvbdmxfeed)
{
	struct dvb_usb_adapter *adap = dvbdmxfeed->demux->priv;
	struct dvb_usb_device *d = adap_to_d(adap);
	int ret = 0;
	dev_dbg(&d->udev->dev,
			"%s: adap=%d active_fe=%d feed_type=%d setting pid [%s]: %04x (%04d) at index %d\n",
			__func__, adap->id, adap->active_fe, dvbdmxfeed->type,
			adap->pid_filtering ? "yes" : "no", dvbdmxfeed->pid,
			dvbdmxfeed->pid, dvbdmxfeed->index);

	if (adap->active_fe == -1)
		return -EINVAL;

	/* remove PID from device HW PID filter */
	if (adap->pid_filtering && adap->props->pid_filter) {
		ret = adap->props->pid_filter(adap, dvbdmxfeed->index,
				dvbdmxfeed->pid, 0);
		if (ret)
			dev_err(&d->udev->dev, "%s: pid_filter() failed=%d\n",
					KBUILD_MODNAME, ret);
	}

	/* we cannot stop streaming until last PID is removed */
	if (--adap->feed_count > 0)
		goto skip_feed_stop;

	/* ask device to stop streaming */
	if (d->props->streaming_ctrl) {
		ret = d->props->streaming_ctrl(adap->fe[adap->active_fe], 0);
		if (ret)
			dev_err(&d->udev->dev,
					"%s: streaming_ctrl() failed=%d\n",
					KBUILD_MODNAME, ret);
	}

	/* disable HW PID filter */
	if (adap->pid_filtering && adap->props->pid_filter_ctrl) {
		ret = adap->props->pid_filter_ctrl(adap, 0);
		if (ret)
			dev_err(&d->udev->dev,
					"%s: pid_filter_ctrl() failed=%d\n",
					KBUILD_MODNAME, ret);
	}

	/* kill USB streaming packets */
	usb_urb_killv2(&adap->stream);

	/* clear 'streaming' status bit */
	clear_bit(ADAP_STREAMING, &adap->state_bits);
	smp_mb__after_atomic();
	wake_up_bit(&adap->state_bits, ADAP_STREAMING);
skip_feed_stop:

	if (ret)
		dev_dbg(&d->udev->dev, "%s: failed=%d\n", __func__, ret);
	return ret;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.