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Fix crash due to dangling pointer in MouseAnnotation

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Summary:
BUG: 388228

Diff applies to Applications/17.12, and should be easy to merge to master. It's kept quite minimal as suggested by Albert.

Albert also suggested to add a dedicated unit test and I'd agree, but am not yet sure how to do it. The original bug involves several classes, including UI: Document, Page, AddAnnotationCommand, PageView, PageViewAnnotator, MouseAnnotation - to name a few. So a test for the exact bug scenario would become a bigger integration test rather than an isolated unit test. The other approach would be to do a real unit test on MouseAnnotation. But again, MouseAnnotation has nasty dependencies (e.g., needs a parent PageView) which I'd have to mock. Any ideas? I'd be interested in a discussion on this topic.

Test Plan:
 # Load a document (e.g. [[ http://www.philipebert.info/resources/WhatMathematicalKnowledgeCouldNotBe.pdf | linked PDF from bug report ]]) and enable highlight toolbar (F6).
 # Create highlight annotation.
 # Move the view port so that the annotation position is right beside the highlight tool icon.
 # Move the mouse over the annotation, and then horizontally left until you reach the tool icon; it's important to stay over the highlight annotation as long as in viewport.
 # Press ctrl-z for undo.
 # Click on highlight tool, move right into the document, create new highlight annotation.
 # Okular doesn't crash.

Reviewers: #okular

Subscribers: aacid, ngraham

Tags: #okular

Differential Revision: https://phabricator.kde.org/D9852
This commit is contained in:
Tobias Deiminger 2018-02-25 18:13:25 +01:00 committed by Albert Astals Cid
parent 77ee07cef5
commit 3c4f16ea4b
3 changed files with 48 additions and 10 deletions
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6
ui/pageview.cpp
View file

@ -1411,11 +1411,7 @@ void PageView::notifyPageChanged( int pageNumber, int changedFlags )
}
}
QLinkedList< Okular::Annotation * >::ConstIterator annIt = qFind( annots, d->mouseAnnotation->annotation() );
if ( annIt == annItEnd )
{
d->mouseAnnotation->cancel();
}
d->mouseAnnotation->notifyAnnotationChanged( pageNumber );
}
if ( changedFlags & DocumentObserver::BoundingBox )

44
ui/pageviewmouseannotation.cpp
View file

@ -42,6 +42,23 @@ bool AnnotationDescription::isValid() const
return ( annotation != nullptr );
}
bool AnnotationDescription::isContainedInPage( const Okular::Document * document, int pageNumber ) const
{
if ( AnnotationDescription::pageNumber == pageNumber )
{
/* Don't access page via pageViewItem here. pageViewItem might have been deleted. */
const Okular::Page * page = document->page( pageNumber );
if ( page != nullptr )
{
if ( page->annotations().contains( annotation ) )
{
return true;
}
}
}
return false;
}
void AnnotationDescription::invalidate()
{
annotation = nullptr;
@ -403,6 +420,24 @@ Qt::CursorShape MouseAnnotation::cursor() const
return Qt::ArrowCursor;
}
void MouseAnnotation::notifyAnnotationChanged( int pageNumber )
{
const AnnotationDescription emptyAd;
if ( m_focusedAnnotation.isValid() &&
! m_focusedAnnotation.isContainedInPage( m_document, pageNumber ) )
{
setState( StateInactive, emptyAd );
}
if ( m_mouseOverAnnotation.isValid() &&
! m_mouseOverAnnotation.isContainedInPage( m_document, pageNumber ) )
{
m_mouseOverAnnotation = emptyAd;
m_pageView->updateCursor();
}
}
void MouseAnnotation::updateAnnotationPointers()
{
if (m_focusedAnnotation.annotation)
@ -552,9 +587,12 @@ void MouseAnnotation::finishCommand()
void MouseAnnotation::updateViewport( const AnnotationDescription & ad ) const
{
const QRect & changedPageViewItemRect = getFullBoundingRect( ad );
m_pageView->viewport()->update( changedPageViewItemRect
.translated( ad.pageViewItem->uncroppedGeometry().topLeft() )
.translated( -m_pageView->contentAreaPosition() ) );
if ( changedPageViewItemRect.isValid() )
{
m_pageView->viewport()->update( changedPageViewItemRect
.translated( ad.pageViewItem->uncroppedGeometry().topLeft() )
.translated( -m_pageView->contentAreaPosition() ) );
}
}
/* eventPos: Mouse position in uncropped page coordinates.

8
ui/pageviewmouseannotation.h
View file

@ -46,9 +46,10 @@ class AnnotationDescription
{
public:
AnnotationDescription()
: annotation( nullptr ), pageViewItem( nullptr ), pageNumber( 0 ) {}
: annotation( nullptr ), pageViewItem( nullptr ), pageNumber( -1 ) {}
AnnotationDescription( PageViewItem * newPageViewItem, const QPoint& eventPos );
bool isValid() const;
bool isContainedInPage( const Okular::Document * document, int pageNumber ) const;
void invalidate();
bool operator==( const AnnotationDescription & rhs ) const
{
@ -116,7 +117,10 @@ public:
Qt::CursorShape cursor() const;
// needs to be called after document save
/* Forward DocumentObserver::notifyPageChanged to this method. */
void notifyAnnotationChanged( int pageNumber );
/* Forward DocumentObserver::notifySetup to this method. */
void updateAnnotationPointers();
enum MouseAnnotationState {