[fireball] 55266: Fix a dcattr memory leak. Similar leak was already fixed in trunk in bug 6119. Huge (really!) thanks goes to igorko for finding all related fixes in trunk, for regress-testing the...

Author: fireball
Date: Fri Jan 27 22:01:24 2012
New Revision: 55266

URL: http://svn.reactos.org/svn/reactos?rev=55266&view=rev
Log:
Fix a dcattr memory leak. Similar leak was already fixed in trunk in bug 6119. Huge (really!) thanks goes to igorko for finding all related fixes in trunk, for regress-testing the issue and finding the one and only, absolutely correct, guilty revision. After that, fixing it was just a few minutes work.

Modified:
    branches/arwinss/reactos/subsystems/win32/win32k/gdi/dc.c

Modified: branches/arwinss/reactos/subsystems/win32/win32k/gdi/dc.c
URL: http://svn.reactos.org/svn/reactos/branches/arwinss/reactos/subsystems/win32...
==============================================================================
--- branches/arwinss/reactos/subsystems/win32/win32k/gdi/dc.c [iso-8859-1] (original)
+++ branches/arwinss/reactos/subsystems/win32/win32k/gdi/dc.c [iso-8859-1] Fri Jan 27 22:01:24 2012
@@ -99,6 +99,33 @@
   DC_UnlockDc(pDC);
 }

+VOID
+FASTCALL
+DC_FreeDcAttr(HDC DCToFree)
+{
+    NTSTATUS Status;
+    SIZE_T Size = 0;
+
+    PDC pDC = DC_LockDc(DCToFree);
+    if (pDC->pdcattr == NULL) return; // Internal DC object!
+    pDC->pdcattr = NULL;
+    DC_UnlockDc(pDC);
+
+    {
+        INT Index = GDI_HANDLE_GET_INDEX((HGDIOBJ)DCToFree);
+        PGDI_TABLE_ENTRY Entry = &GdiHandleTable->Entries[Index];
+        if (Entry->UserData)
+        {
+            Status = ZwFreeVirtualMemory(NtCurrentProcess(), &Entry->UserData, &Size, MEM_RELEASE);
+            if (!NT_SUCCESS(Status))
+            {
+                DPRINT1("Failed freeing dcattr memory with Status 0x%08X\n", Status);
+            }
+            Entry->UserData = NULL;
+        }
+    }
+}
+
 BOOL APIENTRY RosGdiCreateDC( HDC *pdev, LPCWSTR driver, LPCWSTR device,
                             LPCWSTR output, const DEVMODEW* initData, ULONG dcType )
 {
@@ -120,7 +147,7 @@
     pNewDC->ppdev = (PVOID)&PrimarySurface;

/* Allocate dc shared memory */
-    DC_AllocateDcAttr(hNewDC);    
+    DC_AllocateDcAttr(hNewDC);

/* Set default fg/bg colors */
     pNewDC->crBackgroundClr = RGB(255, 255, 255);
@@ -191,6 +218,9 @@
 BOOL APIENTRY RosGdiDeleteDC( HDC physDev )
 {
     DPRINT("RosGdiDeleteDC(%x)\n", physDev);
+
+    /* Free DC attr */
+    DC_FreeDcAttr(physDev);

/* Free DC */
     GDIOBJ_FreeObjByHandle(physDev, GDI_OBJECT_TYPE_DC);