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[NTVDM]

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Fix the XMS driver (again):
- Don't return handle information for unallocated handles.
- Don't allow freeing unallocated handles.


svn path=/trunk/; revision=67676
This commit is contained in:
Aleksandar Andrejevic
2015-05-12 03:47:10 +00:00
parent 367a28ce87
commit 5f2e9eb893
1 changed files with 2 additions and 2 deletions
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reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/himem.c
+2 -2
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@@ -281,7 +281,7 @@ static CHAR XmsFree(WORD Handle)
DWORD BlockNumber;
PXMS_HANDLE HandleEntry = GetHandleRecord(Handle);
if (HandleEntry == NULL) return XMS_STATUS_INVALID_HANDLE;
if (HandleEntry == NULL || HandleEntry->Handle == 0) return XMS_STATUS_INVALID_HANDLE;
if (HandleEntry->LockCount) return XMS_STATUS_LOCKED;
BlockNumber = (HandleEntry->Address - XMS_ADDRESS) / XMS_BLOCK_SIZE;
@@ -540,7 +540,7 @@ static VOID WINAPI XmsBopProcedure(LPWORD Stack)
{
PXMS_HANDLE Entry = GetHandleRecord(getDX());
if (Entry)
if (Entry && Entry->Handle != 0)
{
INT i;
UCHAR Handles = 0;