ofz#3005 Timeout

Change-Id: I89e92f6782c47bec63d8f69c10e9539b0d7fd007
Reviewed-on: https://gerrit.libreoffice.org/48824Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

sw/source/filter/ww8/ww8graf.cxx

@@ -1326,7 +1326,7 @@ SdrObject *SwWW8ImplReader::ReadGroup(WW8_DPHEAD const * pHd, SfxAllItemSet &rSe
     SdrObject* pObj = new SdrObjGroup;
 
     short nLeft = static_cast<sal_Int16>(SVBT16ToShort( pHd->cb )) - sizeof( WW8_DPHEAD );
-    for (int i = 0; i < nGrouped; i++)
+    for (int i = 0; i < nGrouped && nLeft >= static_cast<short>(sizeof(WW8_DPHEAD)); ++i)
     {
         SfxAllItemSet aSet(m_pDrawModel->GetItemPool());
         if (SdrObject *pObject = ReadGrafPrimitive(nLeft, aSet))