Location service crashes when receiving unexpected method call

[Pete Woods]

Just run:

dbus-send --system --dest=com.ubuntu.location.Service /com/ubuntu/location/Service org.freedesktop.DBus.Properties.Get string:foo

and the system service will crash.

[Antti Kaijanmäki (kaijanmaki)]

Crash happens inside the dbus-cpp worker thread with:

terminate called after throwing an instance of 'std::runtime_error'
  what(): Mismatch between expected and actual type reported by iterator:
  Expected: string
  Actual: invalid

Probably whatever is handling the Get() for the service is not checking the number of arguments when it tries to read the second string it throws an exception.