Prevent deletion of system-owned objects like brushes returned by
GetSysColorBrush()

reactos/lib/gdi32/objects

diff -u -r1.27 -r1.28
--- dc.c	23 Mar 2004 19:46:49 -0000	1.27
+++ dc.c	23 Mar 2004 22:50:14 -0000	1.28
@@ -8,6 +8,8 @@

 #include <win32k/kapi.h>
 #include <rosrtl/logfont.h>
 

+#define NDEBUG
+#include <debug.h>

 
 /*
  * @implemented

@@ -555,11 +557,15 @@

  */
 BOOL
 STDCALL

-DeleteObject(
-	HGDIOBJ		a0
-	)

+DeleteObject(HGDIOBJ Obj)

 {

-	return NtGdiDeleteObject(a0);

+  if (0 != ((DWORD) Obj & 0x00800000))
+    {
+      DPRINT1("Trying to delete system object 0x%x\n", Obj);
+      return FALSE;
+    }
+
+  return NtGdiDeleteObject(Obj);

 }