30459 2009-10-16 14:29:57 -0700 [Qt] "dangling" pointer to qwebpage's view object can leads QGLauncher to crash 2009-10-16 20:55:23 -0700 1 1 1 Unclassified WebKit WebKit Qt 528+ (Nightly build) PC All RESOLVED FIXED Qt P2 Normal --- 1 tonikitoo tonikitoo hausmann kenneth oldest_to_newest 155238 0 41328 tonikitoo 2009-10-16 14:29:57 -0700 Created attachment 41328 backtrace 1 Steps to reproduce: 1) Open QGLauncher 2) Go to File->Clone View (a 'cloned' view shows up) 3) Put focus on the first window and load a valid URL (problem better reproducible w/ sites that take a while to complete the load and require theming, e.g. a search on google.com) 4) While it is loading, move mouse over the second window and do some random movements (mouse hover) 5) and yet while it is loading, close the second window. QGLauncher crashes while accessing qwebpage::view(), which holds a "dangling" pointer. 155242 1 41329 tonikitoo 2009-10-16 14:30:58 -0700 Created attachment 41329 backtrace 2 another backtrace ... page->view() again 155243 2 tonikitoo 2009-10-16 14:31:34 -0700 Root of the problem: in QGWV's hoverMoveEvent method, a 'view' object (QWidget) is set to 'page' via page->setView(ev->widget()) void QGraphicsWebView::hoverMoveEvent(QGraphicsSceneHoverEvent* ev) { if (d->interactive && d->page) { const bool accepted = ev->isAccepted(); QMouseEvent me = QMouseEvent(QEvent::MouseMove, ev->pos().toPoint(), Qt::NoButton, Qt::NoButton, Qt::NoModifier); d->page->setView(ev->widget()); (...) This 'ev->widget()' object is tied to the 'QGraphicsView' that originated the event (probably "QWidget* view->viewport()") not to the 'QGraphicsScene' object. When we close the second window, the 'QGraphicsView' and its 'viewport' objects are deleted. At this point, qwebpage::view() refers to a "dangling" pointer. 155245 3 tonikitoo 2009-10-16 14:32:24 -0700 taking .. patch coming 155247 4 kenneth 2009-10-16 14:33:09 -0700 d->page->setView(ev->widget()); are not needed anymore after our QWebPageClient changes. Please remove them all :-) 155254 5 41331 tonikitoo 2009-10-16 14:42:45 -0700 Created attachment 41331 patch 0.1 - use QPointer to make 'view' 0 at its deletion. 155258 6 kenneth 2009-10-16 14:48:12 -0700 Patch is not right. The right fix is to remove those setPage calls that make no sense anymore. 155259 7 41331 tonikitoo 2009-10-16 14:52:14 -0700 Comment on attachment 41331 patch 0.1 - use QPointer to make 'view' 0 at its deletion. ok, patch does more than it should. i will make the deletion part into another separated patch and patch kenneth's suggestion. 155274 8 41333 tonikitoo 2009-10-16 15:09:14 -0700 Created attachment 41333 patch 0.2 - remove setView calls at event handling 155277 9 kenneth 2009-10-16 15:14:42 -0700 LGTM! Please review someone. 155334 10 41333 hausmann 2009-10-16 18:15:31 -0700 Comment on attachment 41333 patch 0.2 - remove setView calls at event handling Looks good to me, too :-) 155354 11 tonikitoo 2009-10-16 20:51:57 -0700 thx simon and kenneth. landed in r49729 155356 12 41333 tonikitoo 2009-10-16 20:55:23 -0700 Comment on attachment 41333 patch 0.2 - remove setView calls at event handling clearing r+ flag since patch has landed. 41328 2009-10-16 14:29:57 -0700 2009-10-16 14:29:57 -0700 backtrace 1 bt1.txt text/plain 4472 tonikitoo UHJvZ3JhbSByZWNlaXZlZCBzaWduYWwgU0lHU0VHViwgU2VnbWVudGF0aW9uIGZhdWx0LgpbU3dp dGNoaW5nIHRvIFRocmVhZCAweGIzZTM3OTIwIChMV1AgMjI5MDMpXQoweGI0ZWRhZTlhIGluIFFX aWRnZXQ6Omhhc0ZvY3VzICh0aGlzPTB4OTUyNWQ5OCkgYXQga2VybmVsL3F3aWRnZXQuY3BwOjU5 NDcKd2FybmluZzogU291cmNlIGZpbGUgaXMgbW9yZSByZWNlbnQgdGhhbiBleGVjdXRhYmxlLgo1 OTQ3CSAgICB3aGlsZSAody0+ZF9mdW5jKCktPmV4dHJhICYmIHctPmRfZnVuYygpLT5leHRyYS0+ 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ZXJMYXllci5jcHA6MjIzNwoK 41331 2009-10-16 14:42:45 -0700 2009-10-16 14:52:14 -0700 patch 0.1 - use QPointer to make 'view' 0 at its deletion. 0001--Qt-dangling-pointer-to-qwebpage-s-view-object-ca.patch text/plain 3789 tonikitoo RnJvbSBmM2ZhYjRhNmYwZGQwNjg4MTBjMzQwMDY0NGRiNmYyYzMxYmFiMjk5IE1vbiBTZXAgMTcg MDA6MDA6MDAgMjAwMQpGcm9tOiBBbnRvbmlvIEdvbWVzIDx0b25pa2l0b29Ad2Via2l0Lm9yZz4K RGF0ZTogRnJpLCAxNiBPY3QgMjAwOSAxNzo0MToxNiAtMDQwMApTdWJqZWN0OiBbUEFUQ0hdIFtR dF0gImRhbmdsaW5nIiBwb2ludGVyIHRvIHF3ZWJwYWdlJ3MgdmlldyBvYmplY3QgY2FuIGxlYWRz IFFHTGF1bmNoZXIgdG8gY3Jhc2gKIGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3Nob3dfYnVnLmNn aT9pZD0zMDQ1OQoKUGF0Y2ggYnkgQW50b25pbyBHb21lcyA8dG9uaWtpdG9vQHdlYmtpdC5vcmc+ IG9uIDIwMDktMTAtMTYKUmV2aWV3ZWQgYnkgTk9CT0RZIChPT1BTISkuCgpQYXRjaCBtYWtlcyBR V2ViUGFnZVByaXZhdGUncyB2aWV3IG9iamVjdCB0byBiZSBhIFFQb2ludGVyLiBJdCBzZXRzICd2 aWV3JyB0byAwIGFmdGVyIGl0CmdldHMgZGVsZXRlZC4KCiJHdWFyZGVkIHBvaW50ZXJzIGFyZSB1 c2VmdWwgd2hlbmV2ZXIgeW91IG5lZWQgdG8gc3RvcmUgYSBwb2ludGVyIHRvIGEgUU9iamVjdCB0 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