static int dvb_usb_start_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;
	struct usb_data_stream_properties stream_props;
	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);

	/* wait init is done */
	wait_on_bit(&adap->state_bits, ADAP_INIT, TASK_UNINTERRUPTIBLE);

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

	/* skip feed setup if we are already feeding */
	if (adap->feed_count++ > 0)
		goto skip_feed_start;

	/* set 'streaming' status bit */
	set_bit(ADAP_STREAMING, &adap->state_bits);

	/* resolve input and output streaming parameters */
	if (d->props->get_stream_config) {
		memcpy(&stream_props, &adap->props->stream,
				sizeof(struct usb_data_stream_properties));
		ret = d->props->get_stream_config(adap->fe[adap->active_fe],
				&adap->ts_type, &stream_props);
		if (ret)
			dev_err(&d->udev->dev,
					"%s: get_stream_config() failed=%d\n",
					KBUILD_MODNAME, ret);
	} else {
		stream_props = adap->props->stream;
	}

	switch (adap->ts_type) {
	case DVB_USB_FE_TS_TYPE_204:
		adap->stream.complete = dvb_usb_data_complete_204;
		break;
	case DVB_USB_FE_TS_TYPE_RAW:
		adap->stream.complete = dvb_usb_data_complete_raw;
		break;
	case DVB_USB_FE_TS_TYPE_188:
	default:
		adap->stream.complete = dvb_usb_data_complete;
		break;
	}

	/* submit USB streaming packets */
	usb_urb_submitv2(&adap->stream, &stream_props);

	/* enable HW PID filter */
	if (adap->pid_filtering && adap->props->pid_filter_ctrl) {
		ret = adap->props->pid_filter_ctrl(adap, 1);
		if (ret)
			dev_err(&d->udev->dev,
					"%s: pid_filter_ctrl() failed=%d\n",
					KBUILD_MODNAME, ret);
	}

	/* ask device to start streaming */
	if (d->props->streaming_ctrl) {
		ret = d->props->streaming_ctrl(adap->fe[adap->active_fe], 1);
		if (ret)
			dev_err(&d->udev->dev,
					"%s: streaming_ctrl() failed=%d\n",
					KBUILD_MODNAME, ret);
	}
skip_feed_start:

	/* add PID to device HW PID filter */
	if (adap->pid_filtering && adap->props->pid_filter) {
		ret = adap->props->pid_filter(adap, dvbdmxfeed->index,
				dvbdmxfeed->pid, 1);
		if (ret)
			dev_err(&d->udev->dev, "%s: pid_filter() failed=%d\n",
					KBUILD_MODNAME, ret);
	}

	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.