dbus_name_owner_changed_callback: acquire a ref on the manager before using it

playerctl/playerctl-player-manager.c

@@ -243,8 +243,10 @@ static void dbus_name_owner_changed_callback(GDBusProxy *proxy, gchar *sender_na
                                              gchar *signal_name, GVariant *parameters,
                                              gpointer *data) {
     PlayerctlPlayerManager *manager = PLAYERCTL_PLAYER_MANAGER(data);
+    g_object_ref(manager);
 
     if (g_strcmp0(signal_name, "NameOwnerChanged") != 0) {
+        g_object_unref(manager);
         return;
     }
 
@@ -252,6 +254,7 @@ static void dbus_name_owner_changed_callback(GDBusProxy *proxy, gchar *sender_na
         g_debug("Got unknown parameters on org.freedesktop.DBus "
                 "NameOwnerChange signal: %s",
                 g_variant_get_type_string(parameters));
+        g_object_unref(manager);
         return;
     }
 
@@ -261,6 +264,7 @@ static void dbus_name_owner_changed_callback(GDBusProxy *proxy, gchar *sender_na
 
     if (player_id == NULL) {
         g_variant_unref(name_variant);
+        g_object_unref(manager);
         return;
     }
 
@@ -272,6 +276,7 @@ static void dbus_name_owner_changed_callback(GDBusProxy *proxy, gchar *sender_na
     } else {
         g_error("got unknown proxy in callback (this is a bug in playerctl)");
         g_variant_unref(name_variant);
+        g_object_unref(manager);
         return;
     }
 
@@ -313,6 +318,7 @@ static void dbus_name_owner_changed_callback(GDBusProxy *proxy, gchar *sender_na
     g_variant_unref(name_variant);
     g_variant_unref(previous_owner_variant);
     g_variant_unref(new_owner_variant);
+    g_object_unref(manager);
 }
 
 static gboolean playerctl_player_manager_initable_init(GInitable *initable,