Review Request 110593: Check for null image in drop event

[C. Boemann]

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Ship it!


okay i've checked my work now, and it seems to be unrelated so please commit 

- C. Boemann


On May 22, 2013, 1:39 p.m., Elvis Stansvik wrote:
> 
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> This is an automatically generated e-mail. To reply, visit:
> http://git.reviewboard.kde.org/r/110593/
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> 
> (Updated May 22, 2013, 1:39 p.m.)
> 
> 
> Review request for Calligra and C. Boemann.
> 
> 
> Description
> -------
> 
> When dropping this particular cat
> 
> http://www.mrwallpaper.com/wallpapers/Cat-Sad-Annoyed.jpg
> 
> which I've come to call Cat Astrophy, from Chromium 27.0.1453.93 onto Calligra Words, I get:
> 
> Application: Calligra Words (calligrawords), signal: Aborted
> Using host libthread_db library "/usr/lib/libthread_db.so.1".
> [Current thread is 1 (Thread 0x7f1591110780 (LWP 28742))]
> 
> Thread 2 (Thread 0x7f156d38f700 (LWP 28743)):
> #0  0x00007f158a19909d in poll () from /usr/lib/libc.so.6
> #1  0x00007f158565d134 in ?? () from /usr/lib/libglib-2.0.so.0
> #2  0x00007f158565d23c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
> #3  0x00007f158b0448f6 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
> #4  0x00007f158b01696f in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
> #5  0x00007f158b016c65 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
> #6  0x00007f158af1567f in QThread::exec() () from /usr/lib/libQtCore.so.4
> #7  0x00007f158aff8113 in ?? () from /usr/lib/libQtCore.so.4
> #8  0x00007f158af17d1f in ?? () from /usr/lib/libQtCore.so.4
> #9  0x00007f158ac88dd2 in start_thread () from /usr/lib/libpthread.so.0
> #10 0x00007f158a1a1ced in clone () from /usr/lib/libc.so.6
> 
> Thread 1 (Thread 0x7f1591110780 (LWP 28742)):
> [KCrash Handler]
> #5  0x00007f158a0f11c9 in raise () from /usr/lib/libc.so.6
> #6  0x00007f158a0f25c8 in abort () from /usr/lib/libc.so.6
> #7  0x00007f158af0d8df in qt_message_output(QtMsgType, char const*) () from /usr/lib/libQtCore.so.4
> #8  0x00007f158af0da69 in ?? () from /usr/lib/libQtCore.so.4
> #9  0x00007f158af0e274 in qFatal(char const*, ...) () from /usr/lib/libQtCore.so.4
> #10 0x00007f1572f2d8bd in PictureShapeFactory::createShape (this=0x1e5d8b0, params=0x7fff51f7f660, documentResources=0x1e47790) at /home/estan/kde4/src/calligra/plugins/pictureshape/PictureShapeFactory.cpp:71
> #11 0x00007f157b1bc597 in KWView::addImages (this=0x23d1a10, imageList=..., insertAt=...) at /home/estan/kde4/src/calligra/words/part/KWView.cpp:1134
> #12 0x00007f1590a88804 in KoView::dropEvent (this=0x23d1a10, event=0x7fff51f7fd20) at /home/estan/kde4/src/calligra/libs/main/KoView.cpp:277
> #13 0x00007f158bf371be in QWidget::event(QEvent*) () from /usr/lib/libQtGui.so.4
> #14 0x00007f158bee80ac in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
> #15 0x00007f158beef4fe in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
> #16 0x00007f1590a1827a in KoApplication::notify (this=0x7fff51f80470, receiver=0x2571c00, event=0x7fff51f7fd20) at /home/estan/kde4/src/calligra/libs/main/KoApplication.cpp:556
> #17 0x00007f158b017c3d in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
> #18 0x00007f158bf6d481 in ?? () from /usr/lib/libQtGui.so.4
> #19 0x00007f158bf519bd in QApplication::x11ClientMessage(QWidget*, _XEvent*, bool) () from /usr/lib/libQtGui.so.4
> #20 0x00007f158bf5e88f in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib/libQtGui.so.4
> #21 0x00007f158bf84fb2 in ?? () from /usr/lib/libQtGui.so.4
> #22 0x00007f158565ce46 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
> #23 0x00007f158565d198 in ?? () from /usr/lib/libglib-2.0.so.0
> #24 0x00007f158565d23c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
> #25 0x00007f158b0448d5 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
> #26 0x00007f158bf85066 in ?? () from /usr/lib/libQtGui.so.4
> #27 0x00007f158b01696f in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
> #28 0x00007f158b016c65 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
> #29 0x00007f158b01bccb in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
> #30 0x00007f1590d4d2f4 in kdemain (argc=1, argv=0x7fff51f80658) at /home/estan/kde4/src/calligra/words/app/main.cpp:43
> #31 0x00000000004009d2 in main (argc=1, argv=0x7fff51f80658) at /home/estan/kde4/build/calligra/words/app/calligrawords_dummy.cpp:3
> 
> Apparently it can happen that QMimeData::hasImage() can return true, but QMimeData::imageData returns a null QImage. I guess this should be considered a Qt bug.
> 
> This fix simply introduces a check for a null image to avoid the crash. I guess I should investigate why Qt ends up in this state in the first place, but it doesn't hurt to be careful.
> 
> 
> Diffs
> -----
> 
>   libs/main/KoView.cpp c9c82e5 
> 
> Diff: http://git.reviewboard.kde.org/r/110593/diff/
> 
> 
> Testing
> -------
> 
> Dropped Cat Astrophy before and after the fix and the crash is gone.
> 
> 
> Thanks,
> 
> Elvis Stansvik
> 
>

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