SegFault in ~QSqlDatabase()

The QSqlDatabase Destructor calls close which calls driver->close without testing if driver is a nullptr.

QSqlDatabase::~QSqlDatabase()
{
    if (!d->ref.deref()) {
        close();
        delete d;
    }
}

void QSqlDatabase::close()
{
    d->driver->close();
}

So if your fail to load a driver plugin your always run into a nullptr dereferencation when QSqlDatabase goes out of scope.

The same applies to other functions (e.g. isOpen()) but this is less critical, because I can test if driver is nullptr before calling them. The destructor call is unavoidable. If your fail to load a driver, your run into a SegFault, there is no way to avoid this.

Minimal Example:

int main() {
    auto db = QSqlDatabase::addDatabase("", "");
} // SegFault