struct picolcd_pending *picolcd_send_and_wait(struct hid_device *hdev,
		int report_id, const u8 *raw_data, int size)
{
	struct picolcd_data *data = hid_get_drvdata(hdev);
	struct picolcd_pending *work;
	struct hid_report *report = picolcd_out_report(report_id, hdev);
	unsigned long flags;
	int i, j, k;

	if (!report || !data)
		return NULL;
	if (data->status & PICOLCD_FAILED)
		return NULL;
	work = kzalloc(sizeof(*work), GFP_KERNEL);
	if (!work)
		return NULL;

	init_completion(&work->ready);
	work->out_report = report;
	work->in_report  = NULL;
	work->raw_size   = 0;

	mutex_lock(&data->mutex);
	spin_lock_irqsave(&data->lock, flags);
	for (i = k = 0; i < report->maxfield; i++)
		for (j = 0; j < report->field[i]->report_count; j++) {
			hid_set_field(report->field[i], j, k < size ? raw_data[k] : 0);
			k++;
		}
	if (data->status & PICOLCD_FAILED) {
		kfree(work);
		work = NULL;
	} else {
		data->pending = work;
		hid_hw_request(data->hdev, report, HID_REQ_SET_REPORT);
		spin_unlock_irqrestore(&data->lock, flags);
		wait_for_completion_interruptible_timeout(&work->ready, HZ*2);
		spin_lock_irqsave(&data->lock, flags);
		data->pending = NULL;
	}
	spin_unlock_irqrestore(&data->lock, flags);
	mutex_unlock(&data->mutex);
	return work;
}

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.