static void cqspi_configure_cs_and_sizes(struct spi_nor *nor)
{
	struct cqspi_flash_pdata *f_pdata = nor->priv;
	struct cqspi_st *cqspi = f_pdata->cqspi;
	void __iomem *iobase = cqspi->iobase;
	unsigned int reg;

	/* configure page size and block size. */
	reg = readl(iobase + CQSPI_REG_SIZE);
	reg &= ~(CQSPI_REG_SIZE_PAGE_MASK << CQSPI_REG_SIZE_PAGE_LSB);
	reg &= ~(CQSPI_REG_SIZE_BLOCK_MASK << CQSPI_REG_SIZE_BLOCK_LSB);
	reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK;
	reg |= (nor->page_size << CQSPI_REG_SIZE_PAGE_LSB);
	reg |= (ilog2(nor->mtd.erasesize) << CQSPI_REG_SIZE_BLOCK_LSB);
	reg |= (nor->addr_width - 1);
	writel(reg, iobase + CQSPI_REG_SIZE);

	/* configure the chip select */
	cqspi_chipselect(nor);

	/* Store the new configuration of the controller */
	cqspi->current_page_size = nor->page_size;
	cqspi->current_erase_size = nor->mtd.erasesize;
	cqspi->current_addr_width = nor->addr_width;
}

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.