#ifndef _NTINTSAFE_H_INCLUDED_
#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP | WINAPI_PARTITION_SYSTEM | WINAPI_PARTITION_GAMES)

//
// ULONG multiplication
//
_Must_inspect_result_
__inline
NTSTATUS
RtlULongMult(
    _In_ ULONG ulMultiplicand,
    _In_ ULONG ulMultiplier,
    _Out_ _Deref_out_range_(==, ulMultiplicand * ulMultiplier) ULONG* pulResult)
{
    ULONGLONG ull64Result = UInt32x32To64(ulMultiplicand, ulMultiplier);

    return RtlULongLongToULong(ull64Result, pulResult);
}

#endif
#endif
View code on GitHub

// ntintsafe.h

NTSTATUS RtlULongMult(
  [in]  ULONG ulMultiplicand,
  [in]  ULONG ulMultiplier,
  [out] ULONG *pulResult
);
View the official Windows Driver Kit DDI reference

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

RtlULongMult function

Description

Multiplies one value of type ULONG by another.

Parameters

`ulMultiplicand` [in]

The value to be multiplied by ulMultiplier.

`ulMultiplier` [in]

The value by which to multiply ulMultiplicand.

`pulResult` [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