static void catc_rx_done(struct urb *urb)
{
	struct catc *catc = urb->context;
	u8 *pkt_start = urb->transfer_buffer;
	struct sk_buff *skb;
	int pkt_len, pkt_offset = 0;
	int status = urb->status;

	if (!catc->is_f5u011) {
		clear_bit(RX_RUNNING, &catc->flags);
		pkt_offset = 2;
	}

	if (status) {
		dev_dbg(&urb->dev->dev, "rx_done, status %d, length %d\n",
			status, urb->actual_length);
		return;
	}

	do {
		if(!catc->is_f5u011) {
			pkt_len = le16_to_cpup((__le16*)pkt_start);
			if (pkt_len > urb->actual_length) {
				catc->netdev->stats.rx_length_errors++;
				catc->netdev->stats.rx_errors++;
				break;
			}
		} else {
			pkt_len = urb->actual_length;
		}

		if (!(skb = dev_alloc_skb(pkt_len)))
			return;

		skb_copy_to_linear_data(skb, pkt_start + pkt_offset, pkt_len);
		skb_put(skb, pkt_len);

		skb->protocol = eth_type_trans(skb, catc->netdev);
		netif_rx(skb);

		catc->netdev->stats.rx_packets++;
		catc->netdev->stats.rx_bytes += pkt_len;

		/* F5U011 only does one packet per RX */
		if (catc->is_f5u011)
			break;
		pkt_start += (((pkt_len + 1) >> 6) + 1) << 6;

	} while (pkt_start - (u8 *) urb->transfer_buffer < urb->actual_length);

	if (catc->is_f5u011) {
		if (atomic_read(&catc->recq_sz)) {
			int state;
			atomic_dec(&catc->recq_sz);
			netdev_dbg(catc->netdev, "getting extra packet\n");
			urb->dev = catc->usbdev;
			if ((state = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
				netdev_dbg(catc->netdev,
					   "submit(rx_urb) status %d\n", state);
			}
		} else {
			clear_bit(RX_RUNNING, &catc->flags);
		}
	}
}

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.