Seg fault when reading the Networks attribute (linux)

[cecille]

Problem

Attempting to read the Network attribute from a linux device where the networks have been added but not connected results in a seg fault.

Proposed Solution

This appears to be happening because the code assumes where is a connected interface. Need to add checks around that condition.

bt:
Thread 1 "chip-all-cluste" received signal SIGSEGV, Segmentation fault.
0x00005555557163dd in wpa_fi_w1_wpa_supplicant1_interface_get_current_network (object=0x0) at gen/include/platform/Linux/dbus/wpa/DBusWpaInterface.c:6434
6434 return WPA_FI_W1_WPA_SUPPLICANT1_INTERFACE_GET_IFACE (object)->get_current_network (object);
(gdb) bt
#0 0x00005555557163dd in wpa_fi_w1_wpa_supplicant1_interface_get_current_network (object=0x0) at gen/include/platform/Linux/dbus/wpa/DBusWpaInterface.c:6434
#1 0x00005555556ee4f7 in chip::DeviceLayer::ConnectivityManagerImpl::GetConfiguredNetwork(chip::DeviceLayer::NetworkCommissioning::Network&)
(this=0x55555580f420 chip::DeviceLayer::ConnectivityManagerImpl::sInstance, network=...) at ../../third_party/connectedhomeip/src/platform/Linux/ConnectivityManagerImpl.cpp:1349
#2 0x00005555556f619e in chip::DeviceLayer::NetworkCommissioning::LinuxWiFiDriver::WiFiNetworkIterator::Next(chip::DeviceLayer::NetworkCommissioning::Network&)
(this=0x5555558862b0, item=...) at ../../third_party/connectedhomeip/src/platform/Linux/NetworkCommissioningWiFiDriver.cpp:210
#3 0x00005555555e7567 in operator()chip::app::AttributeValueEncoder::ListEncodeHelper(chip::app::AttributeValueEncoder::ListEncodeHelper const&) const
(__closure=0x7fffffffbb08, encoder=...) at ../../third_party/connectedhomeip/src/app/clusters/network-commissioning/network-commissioning.cpp:150
#4 0x00005555555e763f in chip::app::AttributeValueEncoder::EncodeList<chip::app::Clusters::NetworkCommissioning::Instance::Read(const chip::app::ConcreteReadAttributePath&, chip::app::AttributeValueEncoder&)::<lambda(const auto:10&)> >(struct {...}) (this=0x7fffffffbc40, aCallback=...) at ../../third_party/connectedhomeip/src/app/AttributeAccessInterface.h:227
#5 0x00005555555e4154 in chip::app::Clusters::NetworkCommissioning::Instance::Read(chip::app::ConcreteReadAttributePath const&, chip::app::AttributeValueEncoder&)
(this=0x555555807fe0 <(anonymous namespace)::sWiFiNetworkCommissioningInstance>, aPath=..., aEncoder=...)
at ../../third_party/connectedhomeip/src/app/clusters/network-commissioning/network-commissioning.cpp:145
#6 0x000055555559e794 in chip::app::(anonymous namespace)::ReadViaAccessInterface(chip::FabricIndex, bool, chip::app::ConcreteReadAttributePath const&, chip::app::AttributeReportIBs::Builder&, chip::app::AttributeValueEncoder::AttributeEncodeState*, chip::app::AttributeAccessInterface*, bool*)
(aAccessingFabricIndex=1 '\001', aIsFabricFiltered=true, aPath=..., aAttributeReports=..., aEncoderState=0x7fffffffc3dc, aAccessInterface=0x555555807ff8 <(anonymous namespace)::sWiFiNetworkCommissioningInstance+24>, aTriedEncode=0x7fffffffc17f) at ../../third_party/connectedhomeip/src/app/util/ember-compatibility-functions.cpp:476
#7 0x000055555559ec62 in chip::app::ReadSingleClusterData(chip::Access::SubjectDescriptor const&, bool, chip::app::ConcreteReadAttributePath const&, chip::app::AttributeReportIBs::Builder&, chip::app::AttributeValueEncoder::AttributeEncodeState*) (aSubjectDescriptor=..., aIsFabricFiltered=true, aPath=..., aAttributeReports=..., apEncoderState=0x7fffffffc3dc)
at ../../third_party/connectedhomeip/src/app/util/ember-compatibility-functions.cpp:579
#8 0x0000555555677d03 in chip::app::reporting::Engine::RetrieveClusterData(chip::Access::SubjectDescriptor const&, bool, chip::app::AttributeReportIBs::Builder&, chip::app::ConcreteReadAttributePath const&, chip::app::AttributeValueEncoder::AttributeEncodeState*)
(this=0x55555580d370 chip::app::sInteractionModelEngine+1200, aSubjectDescriptor=..., aIsFabricFiltered=true, aAttributeReportIBs=..., aPath=..., aEncoderState=0x7fffffffc3dc)
at ../../third_party/connectedhomeip/src/app/reporting/Engine.cpp:81
#9 0x000055555567810f in chip::app::reporting::Engine::BuildSingleReportDataAttributeReportIBs(chip::app::ReportDataMessage::Builder&, chip::app::ReadHandler*, bool*, bool*)
(this=0x55555580d370 chip::app::sInteractionModelEngine+1200, aReportDataBuilder=..., apReadHandler=0x555555865eb0, apHasMoreChunks=0x7fffffffc753, apHasEncodedData=0x7fffffffc751) at ../../third_party/connectedhomeip/src/app/reporting/Engine.cpp:179
#10 0x000055555567948c in chip::app::reporting::Engine::BuildAndSendSingleReportData(chip::app::ReadHandler*)
(this=0x55555580d370 chip::app::sInteractionModelEngine+1200, apReadHandler=0x555555865eb0) at ../../third_party/connectedhomeip/src/app/reporting/Engine.cpp:463
#11 0x0000555555679dc2 in chip::app::reporting::Engine::Run() (this=0x55555580d370 chip::app::sInteractionModelEngine+1200)
at ../../third_party/connectedhomeip/src/app/reporting/Engine.cpp:591
#12 0x0000555555679af8 in chip::app::reporting::Engine::Run(chip::System::Layer*, void*)
(aSystemLayer=0x55555580eac0 chip::DeviceLayer::SystemLayerImpl()::gSystemLayerImpl, apAppState=0x55555580d370 chip::app::sInteractionModelEngine+1200)
at ../../third_party/connectedhomeip/src/app/reporting/Engine.cpp:542
#13 0x000055555579b557 in chip::System::TimerData::Callback::Invoke() const (this=0x7fffffffcdd0) at ../../third_party/connectedhomeip/src/system/SystemTimer.h:61
#14 0x000055555579cb41 in chip::System::TimerPoolchip::System::TimerList::Node::Invoke(chip::System::TimerList::Node*)
(this=0x55555580f0c8 chip::DeviceLayer::SystemLayerImpl()::gSystemLayerImpl+1544, timer=0x555555886730) at ../../third_party/connectedhomeip/src/system/SystemTimer.h:224
#15 0x000055555579c76a in chip::System::LayerImplSelect::HandleEvents() (this=0x55555580eac0 chip::DeviceLayer::SystemLayerImpl()::gSystemLayerImpl)
at ../../third_party/connectedhomeip/src/system/SystemLayerImplSelect.cpp:397
#16 0x00005555556f7516 in chip::DeviceLayer::Internal::GenericPlatformManagerImpl_POSIXchip::DeviceLayer::PlatformManagerImpl::_RunEventLoop()
(this=0x55555580f630 chip::DeviceLayer::PlatformManagerImpl::sInstance+16)
at ../../third_party/connectedhomeip/src/include/platform/internal/GenericPlatformManagerImpl_POSIX.ipp:181
#17 0x000055555558f32a in chip::DeviceLayer::PlatformManager::RunEventLoop() (this=0x55555580f620 chip::DeviceLayer::PlatformManagerImpl::sInstance)
at ../../third_party/connectedhomeip/src/include/platform/PlatformManager.h:362
#18 0x000055555559176c in ChipLinuxAppMainLoop() () at ../../third_party/connectedhomeip/examples/platform/linux/AppMain.cpp:329
#19 0x000055555557d652 in main(int, char**) (argc=2, argv=0x7fffffffd0b8) at ../../main.cpp:30