LockScreenAcceleratorController: check if a setting key is available instead of crashing

(bzr r4140)

1 files changed, 22 insertions, 0 deletions

diff --git a/lockscreen/LockScreenAcceleratorController.cpp b/lockscreen/LockScreenAcceleratorController.cpp
index a3d3911f0..80436881d 100644
--- a/lockscreen/LockScreenAcceleratorController.cpp
+++ b/lockscreen/LockScreenAcceleratorController.cpp
@@ -72,6 +72,22 @@ const std::vector<std::string> ALLOWED_XF86_KEYS = {
 "XF86Touchpad",
 };
 
+bool IsSettingKeyAvailable(glib::Object<GSettings> const& settings, std::string const& key)
+{
+ bool available = false;
+ GSettingsSchema* schema;
+
+ g_object_get(glib::object_cast<GObject>(settings), "settings-schema", &schema, nullptr);
+
+ if (schema)
+ {
+ available = g_settings_schema_has_key(schema, key.c_str());
+ g_settings_schema_unref(schema);
+ }
+
+ return available;
+}
+
 bool IsKeyBindingAllowed(std::string const& key)
 {
 if (std::find(begin(ALLOWED_XF86_KEYS), end(ALLOWED_XF86_KEYS), key) != end(ALLOWED_XF86_KEYS))
@@ -82,6 +98,9 @@ bool IsKeyBindingAllowed(std::string const& key)
 
 for (auto const& setting : ALLOWED_MEDIA_KEYS)
 {
+ if (!IsSettingKeyAvailable(media_settings, setting))
+ continue;
+
 Accelerator media_key(glib::String(g_settings_get_string(media_settings, setting.c_str())).Str());
 if (media_key == key_accelerator)
 return true;
@@ -91,6 +110,9 @@ bool IsKeyBindingAllowed(std::string const& key)
 
 for (auto const& setting : ALLOWED_WM_KEYS)
 {
+ if (!IsSettingKeyAvailable(wm_settings, setting))
+ continue;
+
 glib::Variant accels(g_settings_get_value(wm_settings, setting.c_str()), glib::StealRef());
 auto children = g_variant_n_children(accels);