static bool verify_vbr_checksum(struct exfat_dev* dev, void* sector,
		off_t sector_size)
{
	uint32_t vbr_checksum;
	int i;

	if (exfat_pread(dev, sector, sector_size, 0) < 0)
	{
		exfat_error("failed to read boot sector");
		return false;
	}
	vbr_checksum = exfat_vbr_start_checksum(sector, sector_size);
	for (i = 1; i < 11; i++)
	{
		if (exfat_pread(dev, sector, sector_size, i * sector_size) < 0)
		{
			exfat_error("failed to read VBR sector");
			return false;
		}
		vbr_checksum = exfat_vbr_add_checksum(sector, sector_size,
				vbr_checksum);
	}
	if (exfat_pread(dev, sector, sector_size, i * sector_size) < 0)
	{
		exfat_error("failed to read VBR checksum sector");
		return false;
	}
	for (i = 0; i < sector_size / sizeof(vbr_checksum); i++)
		if (le32_to_cpu(((const le32_t*) sector)[i]) != vbr_checksum)
		{
			exfat_error("invalid VBR checksum 0x%x (expected 0x%x)",
					le32_to_cpu(((const le32_t*) sector)[i]), vbr_checksum);
			return false;
		}
	return true;
}

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.