Fix crash on screen lock or computer sleep

[droidmonkey]

• Fixes Crash on Windows after PC wakes up since 2.7.7 #10455
• Fixes Segfault when locking GNOME/Wayland desktop with database open #10432
• Fixes Random Crashes Upon Database Unlocks on Wayland, Specifically #10415

Prevent setting critical key components to nullptr when database data is cleared. This can result in a crash due to race condition between threads.

Added a bunch of asserts to detect this problem and if guards to prevent actual crashes.

Testing strategy

Tested on Windows

Type of change

• ✅ Bug fix (non-breaking change that fixes an issue)

[carun]

I can help test this if there's a build available as I'm able to reproduce the issue consistently.

[old-pigeon]

Also able to reproduce 100%, let me know when I can test.

[dimitris-personal]

Tried this patch on top of 2.7.7 and still got the crash on session lock, steps/environment same as #10432.

[droidmonkey]

You got the same stack trace? That wouldn't be possible.

[dimitris-personal]

Hmm, the stack trace looks the same?

Thread 1 "keepassxc" received signal SIGSEGV, Segmentation fault.
0x0000555971c278cd in Database::transformedDatabaseKey (this=<optimized out>) at /usr/include/qt5/QtCore/qscopedpointer.h:116
warning: 116	/usr/include/qt5/QtCore/qscopedpointer.h: No such file or directory
(gdb) bt
#0  0x0000555971c278cd in Database::transformedDatabaseKey (this=<optimized out>) at /usr/include/qt5/QtCore/qscopedpointer.h:116
#1  0x0000555971c61dcf in Kdbx4Reader::readDatabaseImpl (this=0x55597342a070, device=0x7ffcf2b000c0, headerData=..., key=..., db=<optimized out>)
    at /usr/src/debug/keepassxc-2.7.7-2.fc39.x86_64/src/format/Kdbx4Reader.cpp:61
#2  0x0000555971c5e6df in KdbxReader::readDatabase (db=0x555973fca910, key=..., device=0x7ffcf2b000c0, this=<optimized out>) at /usr/src/debug/keepassxc-2.7.7-2.fc39.x86_64/src/format/KdbxReader.cpp:95
#3  KeePass2Reader::readDatabase (this=<optimized out>, device=0x7ffcf2b000c0, key=..., db=0x555973fca910) at /usr/src/debug/keepassxc-2.7.7-2.fc39.x86_64/src/format/KeePass2Reader.cpp:97
#4  0x0000555971c27bfb in Database::open (this=0x555973fca910, filePath=..., key=..., error=0x7ffcf2b00188) at /usr/src/debug/keepassxc-2.7.7-2.fc39.x86_64/src/core/Database.cpp:149
#5  0x0000555971c8d301 in DatabaseOpenWidget::clearForms (this=this@entry=0x555973a89040) at /usr/src/debug/keepassxc-2.7.7-2.fc39.x86_64/src/gui/DatabaseOpenWidget.cpp:275
#6  0x0000555971c8e7f3 in DatabaseOpenWidget::load (this=0x555973a89040, filename=...) at /usr/src/debug/keepassxc-2.7.7-2.fc39.x86_64/src/gui/DatabaseOpenWidget.cpp:241
#7  0x0000555971ca025f in DatabaseWidget::switchToOpenDatabase (this=0x555972fb4bc0, filePath=...) at /usr/src/debug/keepassxc-2.7.7-2.fc39.x86_64/src/gui/DatabaseWidget.cpp:1355
#8  0x0000555971ca6d8d in DatabaseWidget::lock (this=0x555972fb4bc0) at /usr/src/debug/keepassxc-2.7.7-2.fc39.x86_64/src/gui/DatabaseWidget.cpp:1790
#9  0x0000555971c900ee in DatabaseTabWidget::lockDatabases (this=0x5559729d2c90) at /usr/src/debug/keepassxc-2.7.7-2.fc39.x86_64/src/gui/DatabaseTabWidget.cpp:666
#10 0x00007f4789ce92d8 in void doActivate<false>(QObject*, int, void**) () from /lib64/libQt5Core.so.5
#11 0x00007f4789ce92d8 in void doActivate<false>(QObject*, int, void**) () from /lib64/libQt5Core.so.5
#12 0x0000555971c1bd20 in ScreenLockListenerDBus::qt_metacall (this=0x555972c21fc0, _c=QMetaObject::InvokeMetaMethod, _id=3, _a=0x7ffcf2b00620)
    at /usr/src/debug/keepassxc-2.7.7-2.fc39.x86_64/redhat-linux-build/src/keepassx_core_autogen/FUIKO5VHUE/moc_ScreenLockListenerDBus.cpp:141
#13 0x00007f478b65438b in QDBusConnectionPrivate::deliverCall(QObject*, int, QDBusMessage const&, QVector<int> const&, int) () from /lib64/libQt5DBus.so.5
#14 0x00007f4789cdf9fb in QObject::event(QEvent*) () from /lib64/libQt5Core.so.5
#15 0x00007f478afaeb95 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /lib64/libQt5Widgets.so.5
#16 0x00007f4789cb4e78 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /lib64/libQt5Core.so.5
#17 0x00007f4789cb8325 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /lib64/libQt5Core.so.5
#18 0x00007f4789d078cf in postEventSourceDispatch(_GSource*, int (*)(void*), void*) () from /lib64/libQt5Core.so.5
#19 0x00007f4788511e5c in g_main_context_dispatch_unlocked.lto_priv () from /lib64/libglib-2.0.so.0
#20 0x00007f478856cf18 in g_main_context_iterate_unlocked.isra () from /lib64/libglib-2.0.so.0
#21 0x00007f478850fad3 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#22 0x00007f4789d073b9 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#23 0x00007f4789cb383b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#24 0x00007f4789cbbacb in QCoreApplication::exec() () from /lib64/libQt5Core.so.5
#25 0x0000555971bad3a5 in main (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/keepassxc-2.7.7-2.fc39.x86_64/src/main.cpp:215

I built on Fedora using fedpkg mockbuild after adding this PR's patch to the spec file...

[droidmonkey]

You aren't running the code from this PR then. I removed the line item that is #4 on the trace.

[dimitris-personal]

Yeah, the patch is not being applied in the build for some reason... I rebased it to 2.7.7 but still get that Database::open() frame.

[codecov]

Codecov Report

Attention: Patch coverage is 87.09677% with 4 lines in your changes missing coverage. Please review.

Project coverage is 63.72%. Comparing base (194409a) to head (406d5b2).
Report is 140 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/core/Database.cpp	85.71%	2 Missing ⚠️
...ui/dbsettings/DatabaseSettingsWidgetEncryption.cpp	66.67%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #10458      +/-   ##
===========================================
+ Coverage    63.70%   63.72%   +0.03%     
===========================================
  Files          362      362              
  Lines        44047    44061      +14     
===========================================
+ Hits         28056    28077      +21     
+ Misses       15991    15984       -7     

☔ View full report in Codecov by Sentry.
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[dimitris-personal]

Yup, circled back to this and I was indeed missing the patch application in the spec file. Built 2.7.7 plus this PR's patch and can no longer reproduce #10432.

I did have to disable tests in order for the rpm to build, probably what's also behind the CI failures here (no teamcity access on my end obviously).

[droidmonkey]

Yah I just fixed the test problems, needed to revert some code changes I made that went a little too far.

[benediktwerner]

Any chance we could get a release with this fix? The constant crashes are kinda annoying, so I was hoping we'd get an update soon.

[droidmonkey]

Yes 2.7.8, but use https://snapshot.keepassxc.org for now if you like