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[NTOS:Mm] Fix a 64 bit issue in MmMapViewOfArm3Section (#778)

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Fixes a Clang-Cl warning
CORE-14306
This commit is contained in:
Timo Kreuzer
2018-08-21 11:25:22 +02:00
committed by GitHub
parent d5181e44dd
commit f43a7b81a7
1 changed files with 6 additions and 3 deletions
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9
ntoskrnl/mm/ARM3/section.c
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@@ -9,6 +9,7 @@
/* INCLUDES *******************************************************************/
#include <ntoskrnl.h>
#include <ntintsafe.h>
#define NDEBUG
#include <debug.h>
@@ -2847,6 +2848,7 @@ MmMapViewOfArm3Section(IN PVOID SectionObject,
PCONTROL_AREA ControlArea;
ULONG ProtectionMask;
NTSTATUS Status;
ULONG64 CalculatedViewSize;
PAGED_CODE();
/* Get the segment and control area */
@@ -2893,11 +2895,12 @@ MmMapViewOfArm3Section(IN PVOID SectionObject,
if (!(*ViewSize))
{
/* Compute it for the caller */
*ViewSize = (SIZE_T)(Section->SizeOfSection.QuadPart - SectionOffset->QuadPart);
CalculatedViewSize = Section->SizeOfSection.QuadPart -
SectionOffset->QuadPart;
/* Check if it's larger than 4GB or overflows into kernel-mode */
if ((*ViewSize > 0xFFFFFFFF) ||
(((ULONG_PTR)MM_HIGHEST_VAD_ADDRESS - (ULONG_PTR)*BaseAddress) < *ViewSize))
if (!NT_SUCCESS(RtlULongLongToSIZET(CalculatedViewSize, ViewSize)) ||
(((ULONG_PTR)MM_HIGHEST_VAD_ADDRESS - (ULONG_PTR)*BaseAddress) < CalculatedViewSize))
{
DPRINT1("Section view won't fit\n");
return STATUS_INVALID_VIEW_SIZE;