static void catc_irq_done(struct urb *urb)
{
	struct catc *catc = urb->context;
	u8 *data = urb->transfer_buffer;
	int status = urb->status;
	unsigned int hasdata = 0, linksts = LinkNoChange;
	int res;

	if (!catc->is_f5u011) {
		hasdata = data[1] & 0x80;
		if (data[1] & 0x40)
			linksts = LinkGood;
		else if (data[1] & 0x20)
			linksts = LinkBad;
	} else {
		hasdata = (unsigned int)(be16_to_cpup((__be16*)data) & 0x0fff);
		if (data[0] == 0x90)
			linksts = LinkGood;
		else if (data[0] == 0xA0)
			linksts = LinkBad;
	}

	switch (status) {
	case 0:			/* success */
		break;
	case -ECONNRESET:	/* unlink */
	case -ENOENT:
	case -ESHUTDOWN:
		return;
	/* -EPIPE:  should clear the halt */
	default:		/* error */
		dev_dbg(&urb->dev->dev,
			"irq_done, status %d, data %02x %02x.\n",
			status, data[0], data[1]);
		goto resubmit;
	}

	if (linksts == LinkGood) {
		netif_carrier_on(catc->netdev);
		netdev_dbg(catc->netdev, "link ok\n");
	}

	if (linksts == LinkBad) {
		netif_carrier_off(catc->netdev);
		netdev_dbg(catc->netdev, "link bad\n");
	}

	if (hasdata) {
		if (test_and_set_bit(RX_RUNNING, &catc->flags)) {
			if (catc->is_f5u011)
				atomic_inc(&catc->recq_sz);
		} else {
			catc->rx_urb->dev = catc->usbdev;
			if ((res = usb_submit_urb(catc->rx_urb, GFP_ATOMIC)) < 0) {
				dev_err(&catc->usbdev->dev,
					"submit(rx_urb) status %d\n", res);
			}
		} 
	}
resubmit:
	res = usb_submit_urb (urb, GFP_ATOMIC);
	if (res)
		dev_err(&catc->usbdev->dev,
			"can't resubmit intr, %s-%s, status %d\n",
			catc->usbdev->bus->bus_name,
			catc->usbdev->devpath, res);
}

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.