[gdm] session: keep session object alive while establishing credentials

[Ray Strode <halfline src gnome org>]

commit 0254f3371039e6fa02bde373d08666c1a5272efb
Author: Ray Strode <rstrode redhat com>
Date:   Fri Jan 22 15:59:00 2016 -0500

    session: keep session object alive while establishing credentials
    
    The only reference to session objects gets cleaned up when
    verification-complete is emitted, which happens in the middle
    of the establish_credentials handler.
    
    This commit makes sure the session object stays alive until the
    handler completes to prevent a crash.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=754814

 daemon/gdm-session.c |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/daemon/gdm-session.c b/daemon/gdm-session.c
index 1df71c4..1d857d3 100644
--- a/daemon/gdm-session.c
+++ b/daemon/gdm-session.c
@@ -310,8 +310,8 @@ on_establish_credentials_cb (GdmDBusWorker *proxy,
             g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
                 return;
 
-        self = conversation->session;
-        service_name = conversation->service_name;
+        self = g_object_ref (conversation->session);
+        service_name = g_strdup (conversation->service_name);
 
         if (worked) {
                 if (self->priv->user_verifier_interface != NULL) {
@@ -332,6 +332,9 @@ on_establish_credentials_cb (GdmDBusWorker *proxy,
         } else {
                 report_and_stop_conversation (self, service_name, error);
         }
+
+        g_free (service_name);
+        g_object_unref (self);
 }
 
 static const char **