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Fix potential crash in QNetworkInformation if no network is available

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In some circumstances, an empty QDBusInterface was created. However,
this can lead to a crash on some systems (observed in Ubuntu 20.04).
The crash happens, when no network is available.

Pick-to: 6.3
Change-Id: I37316db547f33f082b8aaa73494db1bdf5aded1d
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
This commit is contained in:
Simeon Kuran 2022-04-25 13:37:53 +02:00
parent 464418f5de
commit 64af542374
1 changed files with 16 additions and 11 deletions
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27
src/plugins/networkinformation/networkmanager/qnetworkmanagerservice.cpp
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@ -119,20 +119,21 @@ QNetworkManagerInterface::NMConnectivityState QNetworkManagerInterface::connecti
return QNetworkManagerInterface::NM_CONNECTIVITY_UNKNOWN;
}
static QDBusInterface getPrimaryDevice(const QDBusObjectPath &devicePath)
static std::optional<QDBusInterface> getPrimaryDevice(const QDBusObjectPath &devicePath)
{
const QDBusInterface connection(NM_DBUS_SERVICE, devicePath.path(),
NM_CONNECTION_DBUS_INTERFACE, QDBusConnection::systemBus());
if (!connection.isValid())
return QDBusInterface({}, {});
return std::nullopt;
const auto devicePaths = connection.property("Devices").value<QList<QDBusObjectPath>>();
if (devicePaths.isEmpty())
return QDBusInterface({}, {});
return std::nullopt;
const QDBusObjectPath primaryDevicePath = devicePaths.front();
return QDBusInterface(NM_DBUS_SERVICE, primaryDevicePath.path(), NM_DEVICE_DBUS_INTERFACE,
QDBusConnection::systemBus());
return std::make_optional<QDBusInterface>(NM_DBUS_SERVICE, primaryDevicePath.path(),
NM_DEVICE_DBUS_INTERFACE,
QDBusConnection::systemBus());
}
std::optional<QDBusObjectPath> QNetworkManagerInterface::primaryConnectionDevicePath() const
@ -160,10 +161,12 @@ auto QNetworkManagerInterface::meteredState() const -> NMMetered
auto QNetworkManagerInterface::extractDeviceType(const QDBusObjectPath &devicePath) const
-> NMDeviceType
{
QDBusInterface primaryDevice = getPrimaryDevice(devicePath);
if (!primaryDevice.isValid())
const auto primaryDevice = getPrimaryDevice(devicePath);
if (!primaryDevice)
return NM_DEVICE_TYPE_UNKNOWN;
const QVariant deviceType = primaryDevice.property("DeviceType");
if (!primaryDevice->isValid())
return NM_DEVICE_TYPE_UNKNOWN;
const QVariant deviceType = primaryDevice->property("DeviceType");
if (!deviceType.isValid())
return NM_DEVICE_TYPE_UNKNOWN;
return static_cast<NMDeviceType>(deviceType.toUInt());
@ -172,10 +175,12 @@ auto QNetworkManagerInterface::extractDeviceType(const QDBusObjectPath &devicePa
auto QNetworkManagerInterface::extractDeviceMetered(const QDBusObjectPath &devicePath) const
-> NMMetered
{
QDBusInterface primaryDevice = getPrimaryDevice(devicePath);
if (!primaryDevice.isValid())
const auto primaryDevice = getPrimaryDevice(devicePath);
if (!primaryDevice)
return NM_METERED_UNKNOWN;
const QVariant metered = primaryDevice.property("Metered");
if (!primaryDevice->isValid())
return NM_METERED_UNKNOWN;
const QVariant metered = primaryDevice->property("Metered");
if (!metered.isValid())
return NM_METERED_UNKNOWN;
return static_cast<NMMetered>(metered.toUInt());