static int cqspi_probe(struct platform_device *pdev)
{
	struct device_node *np = pdev->dev.of_node;
	struct device *dev = &pdev->dev;
	struct cqspi_st *cqspi;
	struct resource *res;
	struct resource *res_ahb;
	int ret;
	int irq;

	cqspi = devm_kzalloc(dev, sizeof(*cqspi), GFP_KERNEL);
	if (!cqspi)
		return -ENOMEM;

	mutex_init(&cqspi->bus_mutex);
	cqspi->pdev = pdev;
	platform_set_drvdata(pdev, cqspi);

	/* Obtain configuration from OF. */
	ret = cqspi_of_get_pdata(pdev);
	if (ret) {
		dev_err(dev, "Cannot get mandatory OF data.\n");
		return -ENODEV;
	}

	/* Obtain QSPI clock. */
	cqspi->clk = devm_clk_get(dev, NULL);
	if (IS_ERR(cqspi->clk)) {
		dev_err(dev, "Cannot claim QSPI clock.\n");
		return PTR_ERR(cqspi->clk);
	}

	/* Obtain and remap controller address. */
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	cqspi->iobase = devm_ioremap_resource(dev, res);
	if (IS_ERR(cqspi->iobase)) {
		dev_err(dev, "Cannot remap controller address.\n");
		return PTR_ERR(cqspi->iobase);
	}

	/* Obtain and remap AHB address. */
	res_ahb = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	cqspi->ahb_base = devm_ioremap_resource(dev, res_ahb);
	if (IS_ERR(cqspi->ahb_base)) {
		dev_err(dev, "Cannot remap AHB address.\n");
		return PTR_ERR(cqspi->ahb_base);
	}

	init_completion(&cqspi->transfer_complete);

	/* Obtain IRQ line. */
	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
		dev_err(dev, "Cannot obtain IRQ.\n");
		return -ENXIO;
	}

	ret = clk_prepare_enable(cqspi->clk);
	if (ret) {
		dev_err(dev, "Cannot enable QSPI clock.\n");
		return ret;
	}

	cqspi->master_ref_clk_hz = clk_get_rate(cqspi->clk);

	ret = devm_request_irq(dev, irq, cqspi_irq_handler, 0,
			       pdev->name, cqspi);
	if (ret) {
		dev_err(dev, "Cannot request IRQ.\n");
		goto probe_irq_failed;
	}

	cqspi_wait_idle(cqspi);
	cqspi_controller_init(cqspi);
	cqspi->current_cs = -1;
	cqspi->sclk = 0;

	ret = cqspi_setup_flash(cqspi, np);
	if (ret) {
		dev_err(dev, "Cadence QSPI NOR probe failed %d\n", ret);
		goto probe_setup_failed;
	}

	return ret;
probe_irq_failed:
	cqspi_controller_enable(cqspi, 0);
probe_setup_failed:
	clk_disable_unprepare(cqspi->clk);
	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.