static int whiteheat_attach(struct usb_serial *serial)
{
	struct usb_serial_port *command_port;
	struct whiteheat_command_private *command_info;
	struct whiteheat_hw_info *hw_info;
	int pipe;
	int ret;
	int alen;
	__u8 *command;
	__u8 *result;

	command_port = serial->port[COMMAND_PORT];

	pipe = usb_sndbulkpipe(serial->dev,
			command_port->bulk_out_endpointAddress);
	command = kmalloc(2, GFP_KERNEL);
	if (!command)
		goto no_command_buffer;
	command[0] = WHITEHEAT_GET_HW_INFO;
	command[1] = 0;

	result = kmalloc(sizeof(*hw_info) + 1, GFP_KERNEL);
	if (!result)
		goto no_result_buffer;
	/*
	 * When the module is reloaded the firmware is still there and
	 * the endpoints are still in the usb core unchanged. This is the
	 * unlinking bug in disguise. Same for the call below.
	 */
	usb_clear_halt(serial->dev, pipe);
	ret = usb_bulk_msg(serial->dev, pipe, command, 2,
						&alen, COMMAND_TIMEOUT_MS);
	if (ret) {
		dev_err(&serial->dev->dev, "%s: Couldn't send command [%d]\n",
			serial->type->description, ret);
		goto no_firmware;
	} else if (alen != 2) {
		dev_err(&serial->dev->dev, "%s: Send command incomplete [%d]\n",
			serial->type->description, alen);
		goto no_firmware;
	}

	pipe = usb_rcvbulkpipe(serial->dev,
				command_port->bulk_in_endpointAddress);
	/* See the comment on the usb_clear_halt() above */
	usb_clear_halt(serial->dev, pipe);
	ret = usb_bulk_msg(serial->dev, pipe, result,
			sizeof(*hw_info) + 1, &alen, COMMAND_TIMEOUT_MS);
	if (ret) {
		dev_err(&serial->dev->dev, "%s: Couldn't get results [%d]\n",
			serial->type->description, ret);
		goto no_firmware;
	} else if (alen != sizeof(*hw_info) + 1) {
		dev_err(&serial->dev->dev, "%s: Get results incomplete [%d]\n",
			serial->type->description, alen);
		goto no_firmware;
	} else if (result[0] != command[0]) {
		dev_err(&serial->dev->dev, "%s: Command failed [%d]\n",
			serial->type->description, result[0]);
		goto no_firmware;
	}

	hw_info = (struct whiteheat_hw_info *)&result[1];

	dev_info(&serial->dev->dev, "%s: Firmware v%d.%02d\n",
		 serial->type->description,
		 hw_info->sw_major_rev, hw_info->sw_minor_rev);

	command_info = kmalloc(sizeof(struct whiteheat_command_private),
								GFP_KERNEL);
	if (!command_info)
		goto no_command_private;

	mutex_init(&command_info->mutex);
	command_info->port_running = 0;
	init_waitqueue_head(&command_info->wait_command);
	usb_set_serial_port_data(command_port, command_info);
	command_port->write_urb->complete = command_port_write_callback;
	command_port->read_urb->complete = command_port_read_callback;
	kfree(result);
	kfree(command);

	return 0;

no_firmware:
	/* Firmware likely not running */
	dev_err(&serial->dev->dev,
		"%s: Unable to retrieve firmware version, try replugging\n",
		serial->type->description);
	dev_err(&serial->dev->dev,
		"%s: If the firmware is not running (status led not blinking)\n",
		serial->type->description);
	dev_err(&serial->dev->dev,
		"%s: please contact support@connecttech.com\n",
		serial->type->description);
	kfree(result);
	kfree(command);
	return -ENODEV;

no_command_private:
	kfree(result);
no_result_buffer:
	kfree(command);
no_command_buffer:
	return -ENOMEM;
}

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.