BUGFIX: unhandled error conditions IntGdiCreateDC()

reactos/subsys/win32k/objects

diff -u -r1.152 -r1.153
--- dc.c	12 Dec 2004 21:58:42 -0000	1.152
+++ dc.c	13 Dec 2004 05:23:59 -0000	1.153
@@ -16,7 +16,7 @@

  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */

-/* $Id: dc.c,v 1.152 2004/12/12 21:58:42 royce Exp $

+/* $Id: dc.c,v 1.153 2004/12/13 05:23:59 royce Exp $

  *
  * DC.C - Device context functions
  *

@@ -738,7 +738,11 @@

 
   NewDC = DC_LockDc( hNewDC );
   /* FIXME - NewDC can be NULL!!! Don't assert here! */

-  ASSERT( NewDC );

+  if ( !NewDC )
+  {
+    DC_FreeDC( hNewDC );
+    return NULL;
+  }

 
   NewDC->DMW = PrimarySurface.DMW;
   NewDC->DevInfo = &PrimarySurface.DevInfo;

@@ -757,6 +761,12 @@

 
   NewDC->DMW.dmLogPixels = 96;
   SurfObj = EngLockSurface((HSURF)PrimarySurface.Handle);

+  if ( !SurfObj )
+  {
+	  DC_UnlockDc ( hNewDC );
+	  DC_FreeDC ( hNewDC) ;
+	  return NULL;
+  }

   NewDC->DMW.dmBitsPerPel = BitsPerFormat(SurfObj->iBitmapFormat);
   NewDC->DMW.dmPelsWidth = SurfObj->sizlBitmap.cx;
   NewDC->DMW.dmPelsHeight = SurfObj->sizlBitmap.cy;