lok: sc: avoid crash on non existent tab view data

... when accessing position helpers.

Change-Id: Ia627a8c4ed30ad1f1c2333df00b656fe041f111e
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/119604
Tested-by: Jenkins
Reviewed-by: Dennis Francis <dennis.francis@collabora.com>

4 files changed, 26 insertions, 9 deletions

diff --git a/sc/source/ui/docshell/docfunc.cxx b/sc/source/ui/docshell/docfunc.cxx
index f98350f0963c..2133ee93bd6e 100644
--- a/sc/source/ui/docshell/docfunc.cxx
+++ b/sc/source/ui/docshell/docfunc.cxx
@@ -170,7 +170,8 @@ bool ScDocFunc::AdjustRowHeight( const ScRange& rRange, bool bPaint, bool bApi )
                 ScTabViewShell* pTabViewShell = dynamic_cast<ScTabViewShell*>(pViewShell);
                 if (pTabViewShell && pTabViewShell->GetDocId() == pSomeViewForThisDoc->GetDocId())
                 {
-                    pTabViewShell->GetViewData().GetLOKHeightHelper(nTab)->invalidateByIndex(nStartRow);
+                    if (ScPositionHelper* pPosHelper = pTabViewShell->GetViewData().GetLOKHeightHelper(nTab))
+                        pPosHelper->invalidateByIndex(nStartRow);
                 }
                 pViewShell = SfxViewShell::GetNext(*pViewShell);
             }
diff --git a/sc/source/ui/view/dbfunc3.cxx b/sc/source/ui/view/dbfunc3.cxx
index 15141c68a064..8258b52d6846 100644
--- a/sc/source/ui/view/dbfunc3.cxx
+++ b/sc/source/ui/view/dbfunc3.cxx
@@ -2290,9 +2290,15 @@ void ScDBFunc::OnLOKShowHideColRow(bool bColumns, SCCOLROW nStart)
         if (pTabViewShell && pTabViewShell->GetDocId() == pThisViewShell->GetDocId())
         {
             if (bColumns)
-                pTabViewShell->GetViewData().GetLOKWidthHelper(nCurrentTabIndex)->invalidateByIndex(nStart);
+            {
+                if (ScPositionHelper* pPosHelper = pTabViewShell->GetViewData().GetLOKWidthHelper(nCurrentTabIndex))
+                    pPosHelper->invalidateByIndex(nStart);
+            }
             else
-                pTabViewShell->GetViewData().GetLOKHeightHelper(nCurrentTabIndex)->invalidateByIndex(nStart);
+            {
+                if (ScPositionHelper* pPosHelper = pTabViewShell->GetViewData().GetLOKHeightHelper(nCurrentTabIndex))
+                    pPosHelper->invalidateByIndex(nStart);
+            }
 
             if (pTabViewShell->getPart() == nCurrentTabIndex)
             {
diff --git a/sc/source/ui/view/viewdata.cxx b/sc/source/ui/view/viewdata.cxx
index 6809df0b38e5..a0a296c73e03 100644
--- a/sc/source/ui/view/viewdata.cxx
+++ b/sc/source/ui/view/viewdata.cxx
@@ -2322,7 +2322,8 @@ void ScViewData::SetTabNo( SCTAB nNewTab )
 
 ScPositionHelper* ScViewData::GetLOKWidthHelper(SCTAB nTabIndex)
 {
-    if (!ValidTab(nTabIndex) || (nTabIndex >= static_cast<SCTAB>(maTabData.size())))
+    if (!ValidTab(nTabIndex) || (nTabIndex >= static_cast<SCTAB>(maTabData.size())) ||
+        !maTabData[nTabIndex])
     {
         return nullptr;
     }
@@ -2331,7 +2332,8 @@ ScPositionHelper* ScViewData::GetLOKWidthHelper(SCTAB nTabIndex)
 
 ScPositionHelper* ScViewData::GetLOKHeightHelper(SCTAB nTabIndex)
 {
-    if (!ValidTab(nTabIndex) || (nTabIndex >= static_cast<SCTAB>(maTabData.size())))
+    if (!ValidTab(nTabIndex) || (nTabIndex >= static_cast<SCTAB>(maTabData.size())) ||
+        !maTabData[nTabIndex])
     {
         return nullptr;
     }
diff --git a/sc/source/ui/view/viewfunc.cxx b/sc/source/ui/view/viewfunc.cxx
index 22f2d26cd98a..fbe8a0b3719c 100644
--- a/sc/source/ui/view/viewfunc.cxx
+++ b/sc/source/ui/view/viewfunc.cxx
@@ -1473,7 +1473,8 @@ void ScViewFunc::OnLOKInsertDeleteColumn(SCCOL nStartCol, tools::Long nOffset)
         ScTabViewShell* pTabViewShell = dynamic_cast<ScTabViewShell*>(pViewShell);
         if (pTabViewShell && pTabViewShell->GetDocId() == pCurrentViewShell->GetDocId())
         {
-            pTabViewShell->GetViewData().GetLOKWidthHelper(nCurrentTabIndex)->invalidateByIndex(nStartCol);
+            if (ScPositionHelper* pPosHelper = pTabViewShell->GetViewData().GetLOKWidthHelper(nCurrentTabIndex))
+                pPosHelper->invalidateByIndex(nStartCol);
 
             // if we remove a column the cursor position  and the current selection
             // in other views could need to be moved on the left by one column.
@@ -1529,7 +1530,8 @@ void ScViewFunc::OnLOKInsertDeleteRow(SCROW nStartRow, tools::Long nOffset)
         ScTabViewShell* pTabViewShell = dynamic_cast<ScTabViewShell*>(pViewShell);
         if (pTabViewShell && pTabViewShell->GetDocId() == pCurrentViewShell->GetDocId())
         {
-            pTabViewShell->GetViewData().GetLOKHeightHelper(nCurrentTabIndex)->invalidateByIndex(nStartRow);
+            if (ScPositionHelper* pPosHelper = pTabViewShell->GetViewData().GetLOKHeightHelper(nCurrentTabIndex))
+                pPosHelper->invalidateByIndex(nStartRow);
 
             // if we remove a row the cursor position and the current selection
             // in other views could need to be moved up by one row.
@@ -1586,9 +1588,15 @@ void ScViewFunc::OnLOKSetWidthOrHeight(SCCOLROW nStart, bool bWidth)
         if (pTabViewShell && pTabViewShell->GetDocId() == pCurrentViewShell->GetDocId())
         {
             if (bWidth)
-                pTabViewShell->GetViewData().GetLOKWidthHelper(nCurTab)->invalidateByIndex(nStart);
+            {
+                if (ScPositionHelper* pPosHelper = pTabViewShell->GetViewData().GetLOKWidthHelper(nCurTab))
+                    pPosHelper->invalidateByIndex(nStart);
+            }
             else
-                pTabViewShell->GetViewData().GetLOKHeightHelper(nCurTab)->invalidateByIndex(nStart);
+            {
+                if (ScPositionHelper* pPosHelper = pTabViewShell->GetViewData().GetLOKHeightHelper(nCurTab))
+                    pPosHelper->invalidateByIndex(nStart);
+            }
         }
         pViewShell = SfxViewShell::GetNext(*pViewShell);
     }