NTSTATUS ReadDeviceSkipUnreadableSectors (PDEVICE_OBJECT deviceObject, byte *buffer, LARGE_INTEGER startOffset, ULONG size, uint64 *badSectorCount)
{
	NTSTATUS status;
	ULONG sectorSize;
	ULONG sectorCount;

	*badSectorCount = 0;

	status = GetDeviceSectorSize (deviceObject, &sectorSize);
	if (!NT_SUCCESS (status))
		return status;

	for (sectorCount = size / sectorSize; sectorCount > 0; --sectorCount, startOffset.QuadPart += sectorSize, buffer += sectorSize)
	{
		status = TCReadDevice (deviceObject, buffer, startOffset, sectorSize);
		if (!NT_SUCCESS (status))
		{
			Dump ("Skipping bad sector at %I64d\n", startOffset.QuadPart);
			memset (buffer, 0, sectorSize);
			++(*badSectorCount);
		}
	}

	return STATUS_SUCCESS;
}

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.