ofz: infinite loop

Change-Id: Ie515421f484c63d07f10e8551464c7dc11facb73
Reviewed-on: https://gerrit.libreoffice.org/50001Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

lotuswordpro/source/filter/lwprowlayout.cxx

@@ -140,12 +140,18 @@ void LwpRowLayout::RegisterStyle()
     LwpObjectID& rCellID= GetChildHead();
     LwpCellLayout * pCellLayout = dynamic_cast<LwpCellLayout *>(rCellID.obj().get());
 
-    while(pCellLayout)
+    std::set<LwpCellLayout*> aSeen;
+    while (pCellLayout)
     {
+        aSeen.insert(pCellLayout);
+
         pCellLayout->SetFoundry(m_pFoundry);
         pCellLayout->RegisterStyle();
         rCellID = pCellLayout->GetNext();
         pCellLayout = dynamic_cast<LwpCellLayout *>(rCellID.obj().get());
+
+        if (aSeen.find(pCellLayout) != aSeen.end())
+            throw std::runtime_error("loop in conversion");
     }
 
 }

lotuswordpro/source/filter/lwptablelayout.cxx

@@ -1121,14 +1121,18 @@ void LwpTableLayout::PutCellVals(LwpFoundry* pFoundry, LwpObjectID aTableID)
         LwpRowList* pRowList = dynamic_cast<LwpRowList*>(aRowListID.obj().get());
 
         //loop the rowlist
-        while( nullptr!=pRowList)
+        std::set<LwpRowList*> aOuterSeen;
+        while (pRowList)
         {
+            aOuterSeen.insert(pRowList);
             sal_uInt16 nRowID =  pRowList->GetRowID();
             {
                 LwpCellList* pCellList = dynamic_cast<LwpCellList*>(pRowList->GetChildHeadID().obj().get());
                 //loop the cellList
-                while( nullptr!=pCellList)
+                std::set<LwpCellList*> aSeen;
+                while (pCellList)
                 {
+                    aSeen.insert(pCellList);
                     {//put cell
                         sal_uInt16 nColID = pCellList->GetColumnID();
 
@@ -1146,9 +1150,13 @@ void LwpTableLayout::PutCellVals(LwpFoundry* pFoundry, LwpObjectID aTableID)
                         }
                     }
                     pCellList = dynamic_cast<LwpCellList*>(pCellList->GetNextID().obj().get());
+                    if (aSeen.find(pCellList) != aSeen.end())
+                        throw std::runtime_error("loop in conversion");
                 }
             }
             pRowList = dynamic_cast<LwpRowList*>(pRowList->GetNextID().obj().get());
+            if (aOuterSeen.find(pRowList) != aOuterSeen.end())
+                throw std::runtime_error("loop in conversion");
         }
 
     }catch (...) {