[tkreuzer] 48579: [WIN32K] - Allocate the DCs prgnVis in DC_AllocDC, instead of "on demand" in GdiSelectVisRgn and properly handle failure case. This fixes a possible crash, when running out of gdi handles.

Author: tkreuzer
Date: Sat Aug 21 19:55:09 2010
New Revision: 48579

URL: http://svn.reactos.org/svn/reactos?rev=48579&view=rev
Log:
[WIN32K]
- Allocate the DCs prgnVis in DC_AllocDC, instead of "on demand" in
GdiSelectVisRgn and properly handle failure case. This fixes a possible crash, when
running out of gdi handles.

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

Modified: trunk/reactos/subsystems/win32/win32k/objects/cliprgn.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/win32/win32k/ob…
==============================================================================
--- trunk/reactos/subsystems/win32/win32k/objects/cliprgn.c [iso-8859-1] (original)
+++ trunk/reactos/subsystems/win32/win32k/objects/cliprgn.c [iso-8859-1] Sat Aug 21
19:55:09 2010
@@ -107,11 +107,7 @@
 
   dc->fs &= ~DC_FLAG_DIRTY_RAO;
 
-  if (dc->prgnVis == NULL)
-  {
-    dc->prgnVis = IntSysCreateRectpRgn(0, 0, 0, 0);
-    GDIOBJ_CopyOwnership(hdc, ((PROSRGNDATA)dc->prgnVis)->BaseObject.hHmgr);
-  }
+  ASSERT (dc->prgnVis != NULL);
 
   retval = NtGdiCombineRgn(((PROSRGNDATA)dc->prgnVis)->BaseObject.hHmgr, hrgn, 0,
RGN_COPY);
   if ( retval != ERROR )

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] Sat Aug 21
19:55:09 2010
@@ -48,6 +48,18 @@
     }
 
     hDC = NewDC->BaseObject.hHmgr;
+
+    /* Allocate a Vis region */
+    NewDC->prgnVis = IntSysCreateRectpRgn(0, 0, 1, 1);
+    if (!NewDC->prgnVis)
+    {
+        DPRINT1("IntSysCreateRectpRgn failed\n");
+        if (!GDIOBJ_FreeObjByHandle(hDC, GDI_OBJECT_TYPE_DC))
+        {
+            ASSERT(FALSE);
+        }
+        return NULL;
+    }
 
     NewDC->pdcattr = &NewDC->dcattr;
     DC_AllocateDcAttr(hDC);
@@ -661,7 +673,6 @@
     PDC pdcNew, pdcOld;
     PDC_ATTR pdcattrNew, pdcattrOld;
     HDC hdcNew, DisplayDC = NULL;
-    HRGN hVisRgn;
     UNICODE_STRING DriverName;
     DWORD Layout = 0;
     HSURF hsurf;
@@ -742,12 +753,6 @@
         NtGdiDeleteObjectApp(DisplayDC);
     }
 
-    hVisRgn = IntSysCreateRectRgn(0, 0, 1, 1);
-    if (hVisRgn)
-    {
-        GdiSelectVisRgn(hdcNew, hVisRgn);
-        REGION_FreeRgnByHandle(hVisRgn);
-    }
     if (Layout) NtGdiSetLayout(hdcNew, -1, Layout);
 
     DC_InitDC(hdcNew);