[gnome-software/wip/rancell/reviews-3-18] Prevent segfault due to indirectly freeing the OAuth credentials

[William Hua <williamhua src gnome org>]

commit 5226127a5b8eaa209bb052d24d260594d3c6cfca
Author: William Hua <william hua canonical com>
Date:   Mon Jan 25 13:54:02 2016 -0500

    Prevent segfault due to indirectly freeing the OAuth credentials

 src/plugins/gs-plugin-ubuntu-reviews.c |   51 ++++++++++++++++++-------------
 1 files changed, 30 insertions(+), 21 deletions(-)
---
diff --git a/src/plugins/gs-plugin-ubuntu-reviews.c b/src/plugins/gs-plugin-ubuntu-reviews.c
index fe033ee..60a0142 100644
--- a/src/plugins/gs-plugin-ubuntu-reviews.c
+++ b/src/plugins/gs-plugin-ubuntu-reviews.c
@@ -839,11 +839,12 @@ set_package_review (GsPlugin *plugin,
                     GError **error)
 {
        GVariant *credentials;
-       const gchar *consumer_key;
-       const gchar *consumer_secret;
-       const gchar *token;
-       const gchar *token_secret;
        CredentialsFoundInfo *info;
+       const gchar *consumer_key = NULL;
+       const gchar *consumer_secret = NULL;
+       const gchar *token = NULL;
+       const gchar *token_secret = NULL;
+       gboolean result;
 
        /* Write review into database so we can easily access it */
        // FIXME
@@ -871,10 +872,11 @@ set_package_review (GsPlugin *plugin,
            !g_variant_lookup (credentials, "consumer_key", "&s", &consumer_key) ||
            !g_variant_lookup (credentials, "consumer_secret", "&s", &consumer_secret) ||
            !g_variant_lookup (credentials, "token", "&s", &token) ||
-           !g_variant_lookup (credentials, "token_secret", "&s", &token_secret)) {
-               if (credentials)
-                       g_variant_unref (credentials);
-
+           !g_variant_lookup (credentials, "token_secret", "&s", &token_secret) ||
+           !consumer_key[0] ||
+           !consumer_secret[0] ||
+           !token[0] ||
+           !token_secret[0]) {
                info = g_new (CredentialsFoundInfo, 1);
                info->plugin = g_object_ref (plugin);
                info->review = g_object_ref (review);
@@ -885,23 +887,30 @@ set_package_review (GsPlugin *plugin,
                                          G_CALLBACK (credentials_found),
                                          info);
 
-               return ubuntu_sso_credentials_call_login_sync (plugin->priv->credentials,
-                                                              "Ubuntu One",
-                                                              g_variant_new_array (G_VARIANT_TYPE ("{ss}"), 
NULL, 0),
-                                                              NULL,
-                                                              error);
+               result = ubuntu_sso_credentials_call_login_sync (plugin->priv->credentials,
+                                                                "Ubuntu One",
+                                                                g_variant_new_array (G_VARIANT_TYPE 
("{ss}"), NULL, 0),
+                                                                NULL,
+                                                                error);
+
+               if (credentials)
+                       g_variant_unref (credentials);
+
+               return result;
        }
 
+       result = send_review (plugin,
+                             review,
+                             package_name,
+                             consumer_key,
+                             consumer_secret,
+                             token,
+                             token_secret,
+                             error);
+
        g_variant_unref (credentials);
 
-       return send_review (plugin,
-                           review,
-                           package_name,
-                           consumer_key,
-                           consumer_secret,
-                           token,
-                           token_secret,
-                           error);
+       return result;
 }
 
 gboolean