Details
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Bug
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Resolution: Done
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P1: Critical
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5.5.0 Beta
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None
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Tested on Mac OSX 10.9
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macOS
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762d49399089821d1d7f13cedaab74dfa68e3357
Description
On Macintosh, if you have a QWidget that allows dragging, and you try to drag a file onto the widget (you don't need to even drop, just drag the file over the widget), Qt crashes with the following stack trace:
0 QScopedPointer<QObjectData, QScopedPointerDeleter<QObjectData>>::data() const qscopedpointer.h 135 0x100dd642c 1 QScopedPointer<QObjectData, QScopedPointerDeleter<QObjectData>>::pointer qGetPtrHelper<QScopedPointer<QObjectData, QScopedPointerDeleter<QObjectData>>>(QScopedPointer<QObjectData, QScopedPointerDeleter<QObjectData>> const&) qglobal.h 983 0x100e0a295 2 QDrag::d_func() const qdrag.h 53 0x100e0a30c 3 QDrag::dragCursor(Qt::DropAction) const qdrag.cpp 336 0x100e0a126 4 -[QNSView handleDrag:] qnsview.mm 1881 0x106932360 5 -[QNSView draggingEntered:] qnsview.mm 1849 0x106931f1e 6 NSCoreDragTrackingProc NSCoreDragTrackingProc 0x7fff8648f7c2 7 DoTrackingMessage DoTrackingMessage 0x7fff8949aca4 8 CoreDragMessageHandler CoreDragMessageHandler 0x7fff8949db36 9 __CFMessagePortPerform __CFMessagePortPerform 0x7fff8ed7ec38 10 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ 0x7fff8ed04829 11 __CFRunLoopDoSource1 __CFRunLoopDoSource1 0x7fff8ed0479e 12 __CFRunLoopRun __CFRunLoopRun 0x7fff8ecf57d6 13 CFRunLoopRunSpecific CFRunLoopRunSpecific 0x7fff8ecf4e75 14 RunCurrentEventLoopInMode RunCurrentEventLoopInMode 0x7fff8abd9a0d 15 ReceiveNextEventCommon ReceiveNextEventCommon 0x7fff8abd97b7 16 _BlockUntilNextEventMatchingListInModeWithFilter _BlockUntilNextEventMatchingListInModeWithFilter 0x7fff8abd95bc 17 _DPSNextEvent _DPSNextEvent 0x7fff8618324e 18 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] 0x7fff8618289b 19 -[NSApplication run] -[NSApplication run] 0x7fff8617699c 20 QCocoaEventDispatcher::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) qcocoaeventdispatcher.mm 418 0x106939b33 21 QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) qeventloop.cpp 128 0x101db8b5a 22 QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) qeventloop.cpp 204 0x101db8d6c 23 QCoreApplication::exec() qcoreapplication.cpp 1216 0x101dbda24 24 QGuiApplication::exec() qguiapplication.cpp 1528 0x100dedfc6 25 QApplication::exec() qapplication.cpp 2977 0x10005d279 26 main main.cpp 10 0x100003d48 27 start start 0x100003ce4
To reproduce this, create an application with the following code:
#include <QApplication> #include <QPlainTextEdit> int main(int argc, char *argv[]) { QApplication a(argc, argv); QPlainTextEdit w; w.show(); return a.exec(); }
Then execute the application. Drag a file onto the widget. I use an image file but it seems that any file type will cause the crash.
If I take a look at what is going on in the debugger, in qnsview.mm, within handleDrag(), the nativeDrag variable on line 1880 is NULL. It is then dereferenced in the next line (1881).
The code that is crashing was added on March 16, 2015 by Filipe Azevedo in commit 939f21be53efabc37b7682a72effab716d8b9410.
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