When doing NtAllocateVirtualMemory, you need to MEM_RELEASE if you intend to

free the memory, otherwise you'll get stray address space hanging around.  This
was noticeable as a leak if you just left the command prompt sitting, because
every DC allocated to blink the cursor kept address space that was never freed.

svn path=/trunk/; revision=30567

reactos/subsystems/win32/win32k/eng/mem.c

@@ -102,7 +102,7 @@ EngFreeUserMem(PVOID pv)
   PUSERMEMHEADER Header = ((PUSERMEMHEADER) pv) - 1;
   ULONG MemSize = sizeof(USERMEMHEADER) + Header->MemSize;
 
-  ZwFreeVirtualMemory(NtCurrentProcess(), (PVOID *) &Header, &MemSize, MEM_DECOMMIT);
+  ZwFreeVirtualMemory(NtCurrentProcess(), (PVOID *) &Header, &MemSize, MEM_RELEASE);
 }
 
 /*

reactos/subsystems/win32/win32k/ntuser/message.c

@@ -887,7 +887,7 @@ NtUserPeekMessage(PNTUSERGETMESSAGEINFO UnsafeInfo,
          if (! NT_SUCCESS(Status))
          {
             ZwFreeVirtualMemory(NtCurrentProcess(), (PVOID *) &UserMem,
-                                &Info.LParamSize, MEM_DECOMMIT);
+                                &Info.LParamSize, MEM_RELEASE);
             SetLastNtError(Status);
             RETURN( (BOOL) -1);
          }

reactos/subsystems/win32/win32k/objects/dc.c

@@ -2418,7 +2418,7 @@ DC_FreeDcAttr(HDC  DCToFree )
       NTSTATUS Status = ZwFreeVirtualMemory(Pid,
                                &Entry->UserData,
                                        &MemSize,
-                                   MEM_DECOMMIT);
+                                   MEM_RELEASE);
       if (NT_SUCCESS(Status))
       {
         DPRINT("DC_FreeDC DC_ATTR 0x%x\n", Entry->UserData);