Test if DBus interface object is valid before using it.

CCBUG: 283241

applet/wirelessstatus.cpp

@@ -59,8 +59,15 @@ public:
 
     void init(RemoteWirelessObject* wobj)
     {
-        if (!wobj)
+        if (!wobj) {
+            kDebug() << "wobj is null";
             return;
+        }
+
+        if (!wobj || !wobj->isValid()) {
+            kDebug() << "wobj is invalid";
+            return;
+        }
 
         if (wobj->operationMode() == Solid::Control::WirelessNetworkInterfaceNm09::Adhoc) {
             adhoc = true;

libs/client/remotewirelessinterfaceconnection.cpp

@@ -81,4 +81,9 @@ Solid::Control::WirelessNetworkInterfaceNm09::OperationMode RemoteWirelessInterf
     return (Solid::Control::WirelessNetworkInterfaceNm09::OperationMode)rsnflags;
 }
 
+bool RemoteWirelessInterfaceConnection::isValid() const
+{
+    Q_D(const RemoteWirelessInterfaceConnection);
+    return d->wirelessInterfaceConnectionIface->isValid();
+}
 // vim: sw=4 sts=4 et tw=100

libs/client/remotewirelessinterfaceconnection.h

@@ -53,6 +53,7 @@ public:
     Solid::Control::AccessPointNm09::WpaFlags wpaFlags() const;
     Solid::Control::AccessPointNm09::WpaFlags rsnFlags() const;
     Solid::Control::WirelessNetworkInterfaceNm09::OperationMode operationMode() const;
+    bool isValid() const;
 Q_SIGNALS:
     void strengthChanged(int);
 protected:

libs/client/remotewirelessnetwork.cpp

@@ -84,4 +84,10 @@ Solid::Control::WirelessNetworkInterfaceNm09::OperationMode RemoteWirelessNetwor
     return (Solid::Control::WirelessNetworkInterfaceNm09::OperationMode)rsnflags;
 }
 
+bool RemoteWirelessNetwork::isValid() const
+{
+    Q_D(const RemoteWirelessNetwork);
+    return d->wirelessNetworkItemInterface->isValid();
+}
+
 // vim: sw=4 sts=4 et tw=100

libs/client/remotewirelessnetwork.h

@@ -54,6 +54,7 @@ public:
     Solid::Control::AccessPointNm09::WpaFlags wpaFlags() const;
     Solid::Control::AccessPointNm09::WpaFlags rsnFlags() const;
     Solid::Control::WirelessNetworkInterfaceNm09::OperationMode operationMode() const;
+    bool isValid() const;
 Q_SIGNALS:
     void strengthChanged(int);
 protected:

libs/client/remotewirelessobject.h

@@ -36,6 +36,7 @@ public:
     virtual Solid::Control::AccessPointNm09::WpaFlags rsnFlags() const = 0;
     virtual Solid::Control::WirelessNetworkInterfaceNm09::OperationMode operationMode() const = 0;
     virtual void strengthChanged(int) = 0;
+    virtual bool isValid() const = 0;
 };
 
 #endif // REMOTEWIRELESSOBJECT_H