static int catc_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
	struct device *dev = &intf->dev;
	struct usb_device *usbdev = interface_to_usbdev(intf);
 	struct net_device *netdev;
 	struct catc *catc;
 	u8 broadcast[ETH_ALEN];
	int pktsz, ret;
 
 	if (usb_set_interface(usbdev,
 			intf->altsetting->desc.bInterfaceNumber, 1)) {
		dev_err(dev, "Can't set altsetting 1.\n");
		return -EIO;
	}

	netdev = alloc_etherdev(sizeof(struct catc));
	if (!netdev)
		return -ENOMEM;

	catc = netdev_priv(netdev);

	netdev->netdev_ops = &catc_netdev_ops;
	netdev->watchdog_timeo = TX_TIMEOUT;
	netdev->ethtool_ops = &ops;

	catc->usbdev = usbdev;
	catc->netdev = netdev;

	spin_lock_init(&catc->tx_lock);
	spin_lock_init(&catc->ctrl_lock);

	init_timer(&catc->timer);
	catc->timer.data = (long) catc;
	catc->timer.function = catc_stats_timer;

	catc->ctrl_urb = usb_alloc_urb(0, GFP_KERNEL);
	catc->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
	catc->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
	catc->irq_urb = usb_alloc_urb(0, GFP_KERNEL);
	if ((!catc->ctrl_urb) || (!catc->tx_urb) || 
	    (!catc->rx_urb) || (!catc->irq_urb)) {
		dev_err(&intf->dev, "No free urbs available.\n");
		ret = -ENOMEM;
		goto fail_free;
	}

	/* The F5U011 has the same vendor/product as the netmate but a device version of 0x130 */
	if (le16_to_cpu(usbdev->descriptor.idVendor) == 0x0423 && 
	    le16_to_cpu(usbdev->descriptor.idProduct) == 0xa &&
	    le16_to_cpu(catc->usbdev->descriptor.bcdDevice) == 0x0130) {
		dev_dbg(dev, "Testing for f5u011\n");
		catc->is_f5u011 = 1;		
		atomic_set(&catc->recq_sz, 0);
		pktsz = RX_PKT_SZ;
	} else {
		pktsz = RX_MAX_BURST * (PKT_SZ + 2);
	}
	
	usb_fill_control_urb(catc->ctrl_urb, usbdev, usb_sndctrlpipe(usbdev, 0),
		NULL, NULL, 0, catc_ctrl_done, catc);

	usb_fill_bulk_urb(catc->tx_urb, usbdev, usb_sndbulkpipe(usbdev, 1),
		NULL, 0, catc_tx_done, catc);

	usb_fill_bulk_urb(catc->rx_urb, usbdev, usb_rcvbulkpipe(usbdev, 1),
		catc->rx_buf, pktsz, catc_rx_done, catc);

	usb_fill_int_urb(catc->irq_urb, usbdev, usb_rcvintpipe(usbdev, 2),
                 catc->irq_buf, 2, catc_irq_done, catc, 1);
 
 	if (!catc->is_f5u011) {
		u32 *buf;
		int i;

 		dev_dbg(dev, "Checking memory size\n");
 
		buf = kmalloc(4, GFP_KERNEL);
		if (!buf) {
			ret = -ENOMEM;
			goto fail_free;
		}

		*buf = 0x12345678;
		catc_write_mem(catc, 0x7a80, buf, 4);
		*buf = 0x87654321;
		catc_write_mem(catc, 0xfa80, buf, 4);
		catc_read_mem(catc, 0x7a80, buf, 4);
 	  
		switch (*buf) {
 		case 0x12345678:
 			catc_set_reg(catc, TxBufCount, 8);
 			catc_set_reg(catc, RxBufCount, 32);
			dev_dbg(dev, "64k Memory\n");
			break;
		default:
			dev_warn(&intf->dev,
				 "Couldn't detect memory size, assuming 32k\n");
		case 0x87654321:
			catc_set_reg(catc, TxBufCount, 4);
			catc_set_reg(catc, RxBufCount, 16);
 			dev_dbg(dev, "32k Memory\n");
 			break;
 		}

		kfree(buf);
 	  
 		dev_dbg(dev, "Getting MAC from SEEROM.\n");
 	  
		catc_get_mac(catc, netdev->dev_addr);
		
		dev_dbg(dev, "Setting MAC into registers.\n");
	  
		for (i = 0; i < 6; i++)
			catc_set_reg(catc, StationAddr0 - i, netdev->dev_addr[i]);
		
		dev_dbg(dev, "Filling the multicast list.\n");
	  
		eth_broadcast_addr(broadcast);
		catc_multicast(broadcast, catc->multicast);
		catc_multicast(netdev->dev_addr, catc->multicast);
		catc_write_mem(catc, 0xfa80, catc->multicast, 64);
		
		dev_dbg(dev, "Clearing error counters.\n");
		
		for (i = 0; i < 8; i++)
			catc_set_reg(catc, EthStats + i, 0);
		catc->last_stats = jiffies;
		
		dev_dbg(dev, "Enabling.\n");
		
		catc_set_reg(catc, MaxBurst, RX_MAX_BURST);
		catc_set_reg(catc, OpModes, OpTxMerge | OpRxMerge | OpLenInclude | Op3MemWaits);
		catc_set_reg(catc, LEDCtrl, LEDLink);
		catc_set_reg(catc, RxUnit, RxEnable | RxPolarity | RxMultiCast);
	} else {
		dev_dbg(dev, "Performing reset\n");
		catc_reset(catc);
		catc_get_mac(catc, netdev->dev_addr);
		
		dev_dbg(dev, "Setting RX Mode\n");
		catc->rxmode[0] = RxEnable | RxPolarity | RxMultiCast;
		catc->rxmode[1] = 0;
		f5u011_rxmode(catc, catc->rxmode);
	}
	dev_dbg(dev, "Init done.\n");
	printk(KERN_INFO "%s: %s USB Ethernet at usb-%s-%s, %pM.\n",
	       netdev->name, (catc->is_f5u011) ? "Belkin F5U011" : "CATC EL1210A NetMate",
	       usbdev->bus->bus_name, usbdev->devpath, netdev->dev_addr);
	usb_set_intfdata(intf, catc);

	SET_NETDEV_DEV(netdev, &intf->dev);
	ret = register_netdev(netdev);
	if (ret)
		goto fail_clear_intfdata;

	return 0;

fail_clear_intfdata:
	usb_set_intfdata(intf, NULL);
fail_free:
	usb_free_urb(catc->ctrl_urb);
	usb_free_urb(catc->tx_urb);
	usb_free_urb(catc->rx_urb);
	usb_free_urb(catc->irq_urb);
	free_netdev(netdev);
	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.