[Libreoffice-commits] core.git: sw/source

[Michael Stahl (via logerrit)]

 sw/source/core/layout/layact.cxx |    2 ++
 sw/source/core/layout/tabfrm.cxx |    2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

New commits:
commit cc5916cd314a27b0cc99560ab887480026630a95
Author:     Michael Stahl <Michael.Stahl at cib.de>
AuthorDate: Wed May 8 16:23:25 2019 +0200
Commit:     Michael Stahl <Michael.Stahl at cib.de>
CommitDate: Thu May 9 10:53:11 2019 +0200

    tdf#124675 sw: fix crash when moving SwTextFrame in table to prev page
    
    The problem is that the SwTabFrame and SwRowFrame that are being
    iterated are deleted:
    
     7 SwFrame::DestroyFrame(SwFrame*) (pFrame=0x79052c0) at sw/source/core/layout/ssfrm.cxx:386
     8 SwTabFrame::RemoveFollowFlowLine() (this=0x5bf07d0) at sw/source/core/layout/tabfrm.cxx:907
     9 SwTabFrame::MakeAll(OutputDevice*) (this=0x5bf07d0) at sw/source/core/layout/tabfrm.cxx:1839
    10 SwFrame::PrepareMake(OutputDevice*) (this=0x5bf07d0) at sw/source/core/layout/calcmove.cxx:344
    11 SwFrame::Calc(OutputDevice*) const (this=0x5bf07d0) at sw/source/core/layout/trvlfrm.cxx:1790
    12 SwFrame::PrepareMake(OutputDevice*) (this=0x603a570) at sw/source/core/layout/calcmove.cxx:247
    13 SwFrame::Calc(OutputDevice*) const (this=0x603a570) at sw/source/core/layout/trvlfrm.cxx:1790
    14 SwFrame::PrepareMake(OutputDevice*) (this=0x5daf120) at sw/source/core/layout/calcmove.cxx:247
    15 SwFrame::Calc(OutputDevice*) const (this=0x5daf120) at sw/source/core/layout/trvlfrm.cxx:1790
    16 SwFrame::PrepareMake(OutputDevice*) (this=0x6005ca0) at sw/source/core/layout/calcmove.cxx:247
    17 SwFrame::Calc(OutputDevice*) const (this=0x6005ca0) at sw/source/core/layout/trvlfrm.cxx:1790
    18 SwFrame::MakePos() (this=0x6094330) at sw/source/core/layout/calcmove.cxx:490
    19 SwTextFrame::MakePos() (this=0x6094330) at sw/source/core/text/frmform.cxx:343
    20 SwContentFrame::MakeAll(OutputDevice*) (this=0x6094330) at sw/source/core/layout/calcmove.cxx:1346
    21 SwFrame::OptPrepareMake() (this=0x6094330) at sw/source/core/layout/calcmove.cxx:368
    22 SwFrame::OptCalc() const (this=0x6094330) at sw/source/core/inc/frame.hxx:1060
    23 SwLayAction::FormatLayout(OutputDevice*, SwLayoutFrame*, bool) (this=0x7ffc6da48350, pLay=0x8a349c0, bAddRect=false) at sw/source/core/layout/layact.cxx:1362
    24 SwLayAction::FormatLayout(OutputDevice*, SwLayoutFrame*, bool) (this=0x7ffc6da48350, pLay=0x79052c0, bAddRect=false) at sw/source/core/layout/layact.cxx:1357
    25 SwLayAction::FormatLayoutTab(SwTabFrame*, bool) (this=0x7ffc6da48350, pTab=0x7a9c300, bAddRect=false) at sw/source/core/layout/layact.cxx:1569
    26 SwLayAction::FormatLayout(OutputDevice*, SwLayoutFrame*, bool) (this=0x7ffc6da48350, pLay=0x7c30300, bAddRect=true) at sw/source/core/layout/layact.cxx:1354
    27 SwLayAction::FormatLayout(OutputDevice*, SwLayoutFrame*, bool) (this=0x7ffc6da48350, pLay=0x79e1780, bAddRect=true) at sw/source/core/layout/layact.cxx:1357
    28 SwLayAction::InternalAction(OutputDevice*) (this=0x7ffc6da48350) at sw/source/core/layout/layact.cxx:546
    
    They are deleted because the last SwTextFrame was moved via MoveBwd() to
    the previous page, and is formatted there.
    (regression from commit 18765b9fa739337d2d891513f6e2fb7c3ce23b50)
    
    Prevent this via:
    
    * delete-guard for the SwRowFrame - causing RemoveFollowFlowLine() to
      return early (also, let it return false, so the Join() isn't even
      called, although that doesn't make a difference in practice because
      of the next item:)
    
    * join-guard for the SwTabFrame - otherwise tabfrm.cxx:2199 will Join()
      it anyway
    
    This means that when the page with the follow-frame is done formatting,
    the empty SwTabFrame with no SwTextFrame in it will remain.  Fortunately
    this is not a problem, because due to the moving, the previous page will
    be invalid and layact.cxx:613 will iterate to the previous page and
    format it again; then tabfrm:2199 of the master SwTabFrame will detect
    that the follow SwTabFrame is empty and Join() it.
    
    Change-Id: I2cca89d63b81e7d4909319fa4feab2f5d67a6ff3
    Reviewed-on: https://gerrit.libreoffice.org/71996
    Tested-by: Jenkins
    Reviewed-by: Michael Stahl <Michael.Stahl at cib.de>

diff --git a/sw/source/core/layout/layact.cxx b/sw/source/core/layout/layact.cxx
index c58261786a6b..8b5922c8a3e7 100644
--- a/sw/source/core/layout/layact.cxx
+++ b/sw/source/core/layout/layact.cxx
@@ -1582,9 +1582,11 @@ bool SwLayAction::FormatLayoutTab( SwTabFrame *pTab, bool bAddRect )
     // format lowers, only if table frame is valid
     if ( pTab->isFrameAreaDefinitionValid() )
     {
+        FlowFrameJoinLockGuard tabG(pTab); // tdf#124675 prevent Join() if pTab becomes empty
         SwLayoutFrame *pLow = static_cast<SwLayoutFrame*>(pTab->Lower());
         while ( pLow )
         {
+            SwFrameDeleteGuard rowG(pLow); // tdf#124675 prevent RemoveFollowFlowLine()
             bChanged |= FormatLayout( m_pImp->GetShell()->GetOut(), pLow, bAddRect );
             if ( IsAgain() )
                 return false;
diff --git a/sw/source/core/layout/tabfrm.cxx b/sw/source/core/layout/tabfrm.cxx
index a9667a964308..c78c5889d3b5 100644
--- a/sw/source/core/layout/tabfrm.cxx
+++ b/sw/source/core/layout/tabfrm.cxx
@@ -859,7 +859,7 @@ bool SwTabFrame::RemoveFollowFlowLine()
     if (pFollowFlowLine->IsDeleteForbidden())
     {
         SAL_WARN("sw.layout", "Cannot remove in-use Follow Flow Line");
-        return true;
+        return false;
     }
 
     // Move content