Make sure device is valid before adding it

src/device/ilister.cpp

@@ -65,6 +65,8 @@ void iLister::EventCallback(const idevice_event_t *event, void *context) {
 void iLister::DeviceAddedCallback(const char *uuid) {
 
   DeviceInfo info = ReadDeviceInfo(uuid);
+  if (!info.valid) return;
+
   QString id = UniqueId(uuid);
 
   QString name = MakeFriendlyName(id);
@@ -196,6 +198,8 @@ iLister::DeviceInfo iLister::ReadDeviceInfo(const char *uuid) {
   DeviceInfo ret;
 
   iMobileDeviceConnection conn(uuid);
+  if (!conn.is_valid()) return ret;
+  ret.valid = conn.is_valid();
   ret.uuid = uuid;
   ret.product_type = conn.GetProperty("ProductType").toString();
   ret.free_bytes = conn.GetProperty("AmountDataAvailable", "com.apple.disk_usage").toULongLong();

src/device/ilister.h

@@ -59,7 +59,9 @@ class iLister : public DeviceLister {
 
  private:
   struct DeviceInfo {
-    DeviceInfo() : free_bytes(0), total_bytes(0) {}
+    DeviceInfo() : valid(false), free_bytes(0), total_bytes(0) {}
+
+    bool valid;
 
     QString uuid;
     QString product_type;

src/device/imobiledeviceconnection.h

@@ -52,6 +52,8 @@ public:
 
   QString GetUnusedFilename(Itdb_iTunesDB *itdb, const Song &metadata);
 
+  bool is_valid() { return device_ && afc_; }
+
 private:
   Q_DISABLE_COPY(iMobileDeviceConnection);