BOOL IsOSAtLeast (OSVersionEnum reqMinOS)
{
	/* When updating this function, update IsOSVersionAtLeast() in Dlgcode.c too. */

	ULONG major = 0, minor = 0;

	ASSERT (OsMajorVersion != 0);

	switch (reqMinOS)
	{
	case WIN_2000:			major = 5; minor = 0; break;
	case WIN_XP:			major = 5; minor = 1; break;
	case WIN_SERVER_2003:	major = 5; minor = 2; break;
	case WIN_VISTA:			major = 6; minor = 0; break;
	case WIN_7:				major = 6; minor = 1; break;
	case WIN_8:				major = 6; minor = 2; break;
	case WIN_8_1:			major = 6; minor = 3; break;
	case WIN_10:			major = 10; minor = 0; break;

	default:
		TC_THROW_FATAL_EXCEPTION;
		break;
	}

	return ((OsMajorVersion << 16 | OsMinorVersion << 8)
		>= (major << 16 | minor << 8));
}

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.