Uploaded image for project: 'Qt'
  1. Qt
  2. QTBUG-62242

QFileSystemWatcher default constructor crashes

XMLWordPrintable

    • Icon: Bug Bug
    • Resolution: Done
    • Icon: P3: Somewhat important P3: Somewhat important
    • 5.9.2
    • 5.9.1
    • Core: Filesystem watching
    • None
    • Windows 7 Enterprise SP1, 64bit

      VS14.0.25325.01, Update 3
    • e612fe8d47bc0fe762668617a5189117ad1aee15 (qtbase/5.9, 3.8.2017, 5.9.2)

       

      New in qt5.9:

      QFileSystemWatcher's QWindowsFileSystemWatcherEngine creates a QWindowsRemovableDriveListener;

      DriveListener in turn installs a NativeEventFilter;

       

      For QFileSystem's default constructor, the parent-pointer that gets passed through to the NativeEventFilter is of course null, yet the constructor for the nativeEventFilter doesn't check if the filter object is null, thus crashes when fetching the data via qGetPtrHelper

       

      Call stack:

      Qt5Cored.dll!QScopedPointer<QObjectData,QScopedPointerDeleter<QObjectData> >::data() Zeile 140 
Qt5Cored.dll!qGetPtrHelper<QScopedPointer<QObjectData,QScopedPointerDeleter<QObjectData> > >(const QScopedPointer<QObjectData,QScopedPointerDeleter<QObjectData> > & p) Zeile 999 
Qt5Cored.dll!QAbstractEventDispatcher::d_func() Zeile 59 
Qt5Cored.dll!QAbstractEventDispatcher::installNativeEventFilter(QAbstractNativeEventFilter * filterObj) Zeile 405 
Qt5Cored.dll!QWindowsRemovableDriveListener::QWindowsRemovableDriveListener(QObject * parent) Zeile 125 
Qt5Cored.dll!QWindowsFileSystemWatcherEngine::QWindowsFileSystemWatcherEngine(QObject * parent) Zeile 328 
Qt5Cored.dll!QFileSystemWatcherPrivate::createNativeEngine(QObject * parent) Zeile 75 
Qt5Cored.dll!QFileSystemWatcherPrivate::init() Zeile 98 
Qt5Cored.dll!QFileSystemWatcher::QFileSystemWatcher(QObject * parent) Zeile 262 
QTDebug.exe!main() Zeile 7 [Externer Code]

       

       

      I attached a minimal code example that crashes

        1. minExample.cpp
          0.2 kB
        2. QObjectOwningAWatcher.cpp
          0.2 kB
        3. QObjectOwningAWatcher.h
          0.3 kB
        4. QTDebug.cpp
          0.3 kB
        5. qtbug62242.zip
          1 kB
        For Gerrit Dashboard: QTBUG-62242
        # Subject Branch Project Status CR V
        201444,2 QFileSystemWatcher/Windows: Fix crash when no QCoreApplication is present 5.9 qt/qtbase Status: MERGED +2 0

            kleint Friedemann Kleint
            oli_h Oliver Henrichs
            Votes:
            0 Vote for this issue
            Watchers:
            5 Start watching this issue

              Created:
              Updated:
              Resolved:

                There are no open Gerrit changes