#ifndef _NTINTSAFE_H_INCLUDED_
#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP | WINAPI_PARTITION_SYSTEM | WINAPI_PARTITION_GAMES)
//
// DWORD_PTR multiplication
//
#ifdef _WIN64

#define RtlDWordPtrMult    RtlULongLongMult

#endif
#endif
#endif
View code on GitHub

#ifndef _NTINTSAFE_H_INCLUDED_
#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP | WINAPI_PARTITION_SYSTEM | WINAPI_PARTITION_GAMES)
//
// DWORD_PTR multiplication
//
#ifdef _WIN64
// ...
#else

_Must_inspect_result_
__inline
NTSTATUS
RtlDWordPtrMult(
    _In_ DWORD_PTR dwMultiplicand,
    _In_ DWORD_PTR dwMultiplier,
    _Out_ _Deref_out_range_(==, dwMultiplicand * dwMultiplier) DWORD_PTR* pdwResult)
{
    ULONGLONG ull64Result = UInt32x32To64(dwMultiplicand, dwMultiplier);

    return RtlULongLongToDWordPtr(ull64Result, pdwResult);
}

#endif
#endif
#endif
View code on GitHub

// ntintsafe.h

NTSTATUS RtlDWordPtrMult(
  [in]  DWORD_PTR dwMultiplicand,
  [in]  DWORD_PTR dwMultiplier,
  [out] DWORD_PTR *pdwResult
);
View the official Windows Driver Kit DDI reference

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Windows Driver Kit DDI reference (nf-ntintsafe-rtldwordptrmult)

RtlDWordPtrMult function

Description

Multiplies one value of type DWORD_PTR by another.

Parameters

`dwMultiplicand` [in]

The value to be multiplied by dwMultiplier.

`dwMultiplier` [in]

The value by which to multiply dwMultiplicand.

`pdwResult` [out]

A pointer to the result. If the operation results in a value that overflows or underflows the capacity of the type, the function returns STATUS_INTEGER_OVERFLOW and this parameter is not valid.

Return value

Returns STATUS_SUCCESS if the operation is successful.

See the implementation of this helper function in ntintsafe.h in the WDK for possible error return values.

Remarks

This is one of a set of inline functions designed to provide arithmetic operations and perform validity checks with minimal impact on performance.

View the official Windows Driver Kit DDI reference