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- Fixed list traversing in MmAlterRegion to correctly handle Length that is greater than real memory area size.

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svn path=/trunk/; revision=9663
This commit is contained in:
Filip Navara 2004-06-13 14:05:53 +00:00
parent 1a9133bf9b
commit 3aa5dd5be2
1 changed files with 5 additions and 3 deletions
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8
reactos/ntoskrnl/mm/region.c
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@ -16,7 +16,7 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* $Id: region.c,v 1.7 2004/04/10 22:35:25 gdalsnes Exp $
/* $Id: region.c,v 1.8 2004/06/13 14:05:53 navaraf Exp $
*
* PROJECT: ReactOS kernel
* FILE: ntoskrnl/mm/region.c
@ -160,6 +160,7 @@ MmAlterRegion(PMADDRESS_SPACE AddressSpace, PVOID BaseAddress,
{
RemainingLength = 0;
}
/*
* If necessary then split the region into the affected and unaffected parts.
*/
@ -186,7 +187,8 @@ MmAlterRegion(PMADDRESS_SPACE AddressSpace, PVOID BaseAddress,
CurrentRegion = CONTAINING_RECORD(CurrentEntry, MM_REGION,
RegionListEntry);
CurrentBaseAddress = (char*)StartAddress + NewRegion->Length;
while (RemainingLength > 0 && CurrentRegion->Length <= RemainingLength)
while (RemainingLength > 0 && CurrentRegion->Length <= RemainingLength &&
CurrentEntry != RegionListHead)
{
if (CurrentRegion->Type != NewType &&
CurrentRegion->Protect != NewProtect)
@ -217,7 +219,7 @@ MmAlterRegion(PMADDRESS_SPACE AddressSpace, PVOID BaseAddress,
/*
* Split any final region.
*/
if (RemainingLength > 0)
if (RemainingLength > 0 && CurrentEntry != RegionListHead)
{
CurrentRegion = CONTAINING_RECORD(CurrentEntry, MM_REGION,
RegionListEntry);