rhbz#852128: sw: avoid table undo crash:

SwUndoTblNdsChg::UndoImpl: to prevent access of deleted table box start
node, disconnect the SwTableBox from the start node before removing the
table box nodes.
This problem was probably introduced with CWS swnewtable
db4de0817df6906db2743239d45f9f0834ab1e91, which changed the order of the
removal operations for unknown reasons.

(cherry picked from commit cf842d7c7f9559bfdbb3924cd05a3a50d1dff5e3)

Conflicts:
	sw/source/core/table/swtable.cxx

Change-Id: Ic59823a84082cc6ff453b2b512cbb8253886ecf3
Reviewed-on: https://gerrit.libreoffice.org/640
Reviewed-by: Miklos Vajna <vmiklos@suse.cz>
Tested-by: Miklos Vajna <vmiklos@suse.cz>

3 files changed, 17 insertions, 3 deletions

diff --git a/sw/inc/swtable.hxx b/sw/inc/swtable.hxx
index 29c779a51ed2..a3525882c142 100644
--- a/sw/inc/swtable.hxx
+++ b/sw/inc/swtable.hxx
@@ -422,6 +422,7 @@ public:
     SwFrmFmt* ClaimFrmFmt();
     void ChgFrmFmt( SwTableBoxFmt *pNewFmt );
 
+    void RemoveFromTable();
     const SwStartNode *GetSttNd() const { return pSttNd; }
     sal_uLong GetSttIdx() const;
 
diff --git a/sw/source/core/table/swtable.cxx b/sw/source/core/table/swtable.cxx
index 3a57a7586b4f..69e755b09a70 100644
--- a/sw/source/core/table/swtable.cxx
+++ b/sw/source/core/table/swtable.cxx
@@ -1747,10 +1747,9 @@ SwTableBox::SwTableBox( SwTableBoxFmt* pFmt, const SwStartNode& rSttNd, SwTableL
     rSrtArr.Insert( p );        // eintragen
 }
 
-SwTableBox::~SwTableBox()
+void SwTableBox::RemoveFromTable()
 {
-    // Inhaltstragende Box ?
-    if( !GetFrmFmt()->GetDoc()->IsInDtor() && pSttNd )
+    if (pSttNd) // box containing contents?
     {
         // an der Table austragen
         const SwTableNode* pTblNd = pSttNd->FindTableNode();
@@ -1759,6 +1758,15 @@ SwTableBox::~SwTableBox()
                                     GetTabSortBoxes();
         SwTableBox *p = this;   // error: &this
         rSrtArr.Remove( p );        // austragen
+        pSttNd = 0; // clear it so this is only run once
+    }
+}
+
+SwTableBox::~SwTableBox()
+{
+    if (!GetFrmFmt()->GetDoc()->IsInDtor())
+    {
+        RemoveFromTable();
     }
 
     // ist die TabelleBox der letzte Client im FrameFormat, kann dieses
diff --git a/sw/source/core/undo/untbl.cxx b/sw/source/core/undo/untbl.cxx
index 11dbb4b7eeaa..e3a6af5d7a6a 100644
--- a/sw/source/core/undo/untbl.cxx
+++ b/sw/source/core/undo/untbl.cxx
@@ -1755,7 +1755,11 @@ void SwUndoTblNdsChg::UndoImpl(::sw::UndoRedoContext & rContext)
                 rDoc.GetNodes()._MoveNodes( aRg, rDoc.GetNodes(), aInsPos, sal_False );
             }
             else
+            {   // first disconnect box from node, otherwise ~SwTableBox would
+                // access pBox->pSttNd, deleted by DeleteSection
+                pBox->RemoveFromTable();
                 rDoc.DeleteSection( rDoc.GetNodes()[ nIdx ] );
+            }
             aDelBoxes.insert( aDelBoxes.end(), pBox );
         }
     }
@@ -1771,6 +1775,7 @@ void SwUndoTblNdsChg::UndoImpl(::sw::UndoRedoContext & rContext)
             // TL_CHART2: notify chart about box to be removed
             if (pPCD)
                 pPCD->DeleteBox( &pTblNd->GetTable(), *pBox );
+            pBox->RemoveFromTable(); // ~SwTableBox would access pBox->pSttNd
             aDelBoxes.insert( aDelBoxes.end(), pBox );
             rDoc.DeleteSection( rDoc.GetNodes()[ nIdx ] );
         }