[weiden] 14978: it's valid to pass lpTargetHandle = NULL to DuplicateHandle()

it's valid to pass lpTargetHandle = NULL to DuplicateHandle()
Modified: trunk/reactos/ntoskrnl/ob/handle.c
  _____

Modified: trunk/reactos/ntoskrnl/ob/handle.c
--- trunk/reactos/ntoskrnl/ob/handle.c	2005-05-04 20:38:43 UTC (rev
14977)
+++ trunk/reactos/ntoskrnl/ob/handle.c	2005-05-04 21:23:13 UTC (rev
14978)
@@ -347,7 +347,7 @@

NtDuplicateObject (IN	HANDLE		SourceProcessHandle,
    	   IN	HANDLE		SourceHandle,
    	   IN	HANDLE		TargetProcessHandle,
-		   OUT	PHANDLE		TargetHandle,
+		   OUT	PHANDLE		TargetHandle  OPTIONAL,
    	   IN	ACCESS_MASK	DesiredAccess,
    	   IN	BOOLEAN		InheritHandle,
    	   ULONG		Options)
@@ -386,7 +386,7 @@

PreviousMode = ExGetPreviousMode();

-   if(PreviousMode != KernelMode)
+   if(TargetHandle != NULL && PreviousMode != KernelMode)
    {
      _SEH_TRY
      {
@@ -488,7 +488,7 @@
    ObDereferenceObject(TargetProcess);
    ObDereferenceObject(SourceProcess);

-   if(NT_SUCCESS(Status))
+   if(NT_SUCCESS(Status) && TargetHandle != NULL)
    {
      _SEH_TRY
      {