[tkreuzer] 48595: [WIN32K] - When doing a cleanup for a DC, check, if the default brushes are set, before dereferencing them. Fixes a possible kernel mode crash. - Remove some obsolete casts

Author: tkreuzer
Date: Sun Aug 22 22:44:36 2010
New Revision: 48595

URL: http://svn.reactos.org/svn/reactos?rev=48595&view=rev
Log:
[WIN32K]
- When doing a cleanup for a DC, check, if the default brushes are set, before
dereferencing them. Fixes a possible kernel mode crash.
- Remove some obsolete casts

Modified:
    trunk/reactos/subsystems/win32/win32k/objects/dclife.c

Modified: trunk/reactos/subsystems/win32/win32k/objects/dclife.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/win32/win32k/ob…
==============================================================================
--- trunk/reactos/subsystems/win32/win32k/objects/dclife.c [iso-8859-1] (original)
+++ trunk/reactos/subsystems/win32/win32k/objects/dclife.c [iso-8859-1] Sun Aug 22
22:44:36 2010
@@ -165,8 +165,10 @@
     DC_vSelectPalette(pDC, NULL);
 
     /* Dereference default brushes */
-    BRUSH_ShareUnlockBrush(pDC->eboText.pbrush);
-    BRUSH_ShareUnlockBrush(pDC->eboBackground.pbrush);
+    if (pDC->eboText.pbrush)
+        BRUSH_ShareUnlockBrush(pDC->eboText.pbrush);
+    if (pDC->eboBackground.pbrush)
+        BRUSH_ShareUnlockBrush(pDC->eboBackground.pbrush);
 
     /* Cleanup the dc brushes */
     EBRUSHOBJ_vCleanup(&pDC->eboFill);
@@ -205,12 +207,12 @@
         }
         if (pDC->prgnVis)
         {   // FIXME! HAX!!!
-            Index =
GDI_HANDLE_GET_INDEX(((PROSRGNDATA)pDC->prgnVis)->BaseObject.hHmgr);
+            Index = GDI_HANDLE_GET_INDEX(pDC->prgnVis->BaseObject.hHmgr);
             Entry = &GdiHandleTable->Entries[Index];
             if (Entry->UserData) FreeObjectAttr(Entry->UserData);
             Entry->UserData = NULL;
             //
-            if (!GDIOBJ_SetOwnership(((PROSRGNDATA)pDC->prgnVis)->BaseObject.hHmgr,
Owner)) return FALSE;
+            if (!GDIOBJ_SetOwnership(pDC->prgnVis->BaseObject.hHmgr, Owner)) return
FALSE;
         }
         if (pDC->rosdc.hGCClipRgn)
         {   // FIXME! HAX!!!