static int gs_can_open(struct net_device *netdev)
{
	struct gs_can *dev = netdev_priv(netdev);
	struct gs_usb *parent = dev->parent;
	int rc, i;
	struct gs_device_mode *dm;
	u32 ctrlmode;

	rc = open_candev(netdev);
	if (rc)
		return rc;

	if (atomic_add_return(1, &parent->active_channels) == 1) {
		for (i = 0; i < GS_MAX_RX_URBS; i++) {
			struct urb *urb;
			u8 *buf;

			/* alloc rx urb */
			urb = usb_alloc_urb(0, GFP_KERNEL);
			if (!urb)
				return -ENOMEM;

			/* alloc rx buffer */
			buf = usb_alloc_coherent(dev->udev,
						 sizeof(struct gs_host_frame),
						 GFP_KERNEL,
						 &urb->transfer_dma);
			if (!buf) {
				netdev_err(netdev,
					   "No memory left for USB buffer\n");
				usb_free_urb(urb);
				return -ENOMEM;
			}

			/* fill, anchor, and submit rx urb */
			usb_fill_bulk_urb(urb,
					  dev->udev,
					  usb_rcvbulkpipe(dev->udev,
							  GSUSB_ENDPOINT_IN),
					  buf,
					  sizeof(struct gs_host_frame),
					  gs_usb_receive_bulk_callback,
					  parent);
			urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;

			usb_anchor_urb(urb, &parent->rx_submitted);

			rc = usb_submit_urb(urb, GFP_KERNEL);
			if (rc) {
				if (rc == -ENODEV)
					netif_device_detach(dev->netdev);

				netdev_err(netdev,
					   "usb_submit failed (err=%d)\n",
					   rc);

				usb_unanchor_urb(urb);
				break;
			}

			/* Drop reference,
			 * USB core will take care of freeing it
			 */
			usb_free_urb(urb);
		}
	}

	dm = kmalloc(sizeof(*dm), GFP_KERNEL);
	if (!dm)
		return -ENOMEM;

	/* flags */
	ctrlmode = dev->can.ctrlmode;
	dm->flags = 0;

	if (ctrlmode & CAN_CTRLMODE_LOOPBACK)
		dm->flags |= GS_CAN_MODE_LOOP_BACK;
	else if (ctrlmode & CAN_CTRLMODE_LISTENONLY)
		dm->flags |= GS_CAN_MODE_LISTEN_ONLY;

	/* Controller is not allowed to retry TX
	 * this mode is unavailable on atmels uc3c hardware
	 */
	if (ctrlmode & CAN_CTRLMODE_ONE_SHOT)
		dm->flags |= GS_CAN_MODE_ONE_SHOT;

	if (ctrlmode & CAN_CTRLMODE_3_SAMPLES)
		dm->flags |= GS_CAN_MODE_TRIPLE_SAMPLE;

	/* finally start device */
	dm->mode = GS_CAN_MODE_START;
	rc = usb_control_msg(interface_to_usbdev(dev->iface),
			     usb_sndctrlpipe(interface_to_usbdev(dev->iface), 0),
			     GS_USB_BREQ_MODE,
			     USB_DIR_OUT | USB_TYPE_VENDOR |
			     USB_RECIP_INTERFACE,
			     dev->channel,
			     0,
			     dm,
			     sizeof(*dm),
			     1000);

	if (rc < 0) {
		netdev_err(netdev, "Couldn't start device (err=%d)\n", rc);
		kfree(dm);
		return rc;
	}

	kfree(dm);

	dev->can.state = CAN_STATE_ERROR_ACTIVE;

	if (!(dev->can.ctrlmode & CAN_CTRLMODE_LISTENONLY))
		netif_start_queue(netdev);

	return 0;
}

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.