[gnome-software] odrs: Fix multithreaded crashes

[Kalev Lember <klember src gnome org>]

commit 0f839ce59f9eb2b4b114031cac0350f375bc3a2f
Author: Kalev Lember <klember redhat com>
Date:   Wed Nov 7 14:25:30 2018 +0100

    odrs: Fix multithreaded crashes
    
    Serialize access to priv->ratings so that we don't end up concurrently
    modifying it from different threads.
    
    https://bugzilla.redhat.com/show_bug.cgi?id=1647426
    https://bugzilla.redhat.com/show_bug.cgi?id=1645410
    https://bugzilla.redhat.com/show_bug.cgi?id=1644975

 plugins/odrs/gs-plugin-odrs.c | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/plugins/odrs/gs-plugin-odrs.c b/plugins/odrs/gs-plugin-odrs.c
index 0c97f0c4..d8ce2267 100644
--- a/plugins/odrs/gs-plugin-odrs.c
+++ b/plugins/odrs/gs-plugin-odrs.c
@@ -42,6 +42,7 @@ struct GsPluginData {
        gchar                   *user_hash;
        gchar                   *review_server;
        GHashTable              *ratings;
+       GMutex                   ratings_mutex;
        GsApp                   *cached_origin;
 };
 
@@ -52,6 +53,7 @@ gs_plugin_initialize (GsPlugin *plugin)
        g_autoptr(GError) error = NULL;
        g_autoptr(GsOsRelease) os_release = NULL;
 
+       g_mutex_init (&priv->ratings_mutex);
        priv->settings = g_settings_new ("org.gnome.software");
        priv->review_server = g_settings_get_string (priv->settings,
                                                     "review-server");
@@ -125,6 +127,7 @@ gs_plugin_odrs_load_ratings (GsPlugin *plugin, const gchar *fn, GError **error)
        JsonObject *json_item;
        g_autoptr(GList) apps = NULL;
        g_autoptr(JsonParser) json_parser = NULL;
+       g_autoptr(GMutexLocker) locker = g_mutex_locker_new (&priv->ratings_mutex);
 
        /* remove all existing */
        g_hash_table_remove_all (priv->ratings);
@@ -220,6 +223,7 @@ gs_plugin_destroy (GsPlugin *plugin)
        g_hash_table_unref (priv->ratings);
        g_object_unref (priv->settings);
        g_object_unref (priv->cached_origin);
+       g_mutex_clear (&priv->ratings_mutex);
 }
 
 static AsReview *
@@ -497,6 +501,7 @@ gs_plugin_odrs_refine_ratings (GsPlugin *plugin,
        reviewable_ids = _gs_app_get_reviewable_ids (app);
        for (guint i = 0; i < reviewable_ids->len; i++) {
                const gchar *id = g_ptr_array_index (reviewable_ids, i);
+               g_autoptr(GMutexLocker) locker = g_mutex_locker_new (&priv->ratings_mutex);
                GArray *ratings_tmp = g_hash_table_lookup (priv->ratings, id);
                if (ratings_tmp == NULL)
                        continue;