coverity#1343626 Unchecked dynamic_cast

Change-Id: I52e6d6c9cb48880185293fb9825d7a6530ee767d

lotuswordpro/source/filter/lwpfribsection.cxx

@@ -245,9 +245,12 @@ LwpMasterPage::LwpMasterPage(LwpPara* pPara, LwpPageLayout* pLayout)
 bool LwpMasterPage::RegisterMasterPage(LwpFrib* pFrib)
 {
     //if there is no other frib after current frib, register master page in starting para of next page
-    if(IsNextPageType()&&(!pFrib->HasNextFrib()))
+    LwpStory* pStory = nullptr;
+    if (IsNextPageType()&&(!pFrib->HasNextFrib()))
+        pStory = dynamic_cast<LwpStory*>(m_pPara->GetStoryID().obj().get());
+
+    if (pStory)
     {
-        LwpStory* pStory = dynamic_cast<LwpStory*>(m_pPara->GetStoryID().obj().get());
         pStory->SetCurrentLayout(m_pLayout);
         RegisterFillerPageStyle();
         return false;
@@ -278,14 +281,17 @@ bool LwpMasterPage::RegisterMasterPage(LwpFrib* pFrib)
         case LwpLayout::StartOnOddPage: //fall through
         case LwpLayout::StartOnEvenPage:
         {
-            LwpStory* pStory = dynamic_cast<LwpStory*>(m_pPara->GetStoryID().obj().get());
-            pStory->SetCurrentLayout(m_pLayout);
-            //get odd page layout when the current pagelayout is mirror
-            m_pLayout = pStory->GetCurrentLayout();
-            m_bNewSection = IsNeedSection();
-            //bSectionColumns = m_bNewSection;
-            pOverStyle->SetMasterPage( m_pLayout->GetStyleName());
-            RegisterFillerPageStyle();
+            pStory = dynamic_cast<LwpStory*>(m_pPara->GetStoryID().obj().get());
+            if (pStory)
+            {
+                pStory->SetCurrentLayout(m_pLayout);
+                //get odd page layout when the current pagelayout is mirror
+                m_pLayout = pStory->GetCurrentLayout();
+                m_bNewSection = IsNeedSection();
+                //bSectionColumns = m_bNewSection;
+                pOverStyle->SetMasterPage( m_pLayout->GetStyleName());
+                RegisterFillerPageStyle();
+            }
             break;
         }
         default:
@@ -293,7 +299,10 @@ bool LwpMasterPage::RegisterMasterPage(LwpFrib* pFrib)
     }
 
     //register tab style;
-    LwpStory* pStory = dynamic_cast<LwpStory*>(m_pPara->GetStoryID().obj().get());
+    pStory = dynamic_cast<LwpStory*>(m_pPara->GetStoryID().obj().get());
+    if (!pStory)
+        return false;
+
     pStory->SetTabLayout(m_pLayout);
     m_pPara->RegisterTabStyle(pOverStyle);
 
@@ -305,7 +314,7 @@ bool LwpMasterPage::RegisterMasterPage(LwpFrib* pFrib)
         XFSectionStyle* pSectStyle= new XFSectionStyle();
         //set margin
         pStory = dynamic_cast<LwpStory*>(m_pPara->GetStoryID().obj().get());
-        if(pStory)
+        if (pStory)
         {
             LwpPageLayout* pCurrentLayout = pStory->GetCurrentLayout();
             double fLeft = m_pLayout->GetMarginsValue(MARGIN_LEFT)- pCurrentLayout->GetMarginsValue(MARGIN_LEFT);