Handle error from libhal_find_device_by_capability.

libhal_find_device_by_capability may encounter errors, e.g. due to a
broken HAL configuration. These errors have to be dealt with before
the list of devices is traversed. Otherwise a SIGSEGV might occur.

2009-07-22 Martin von Gagern

References: http://bugs.gentoo.org/278760Index: xorg-server-1.6.2/config/hal.c
===================================================================
Index: xorg-server-1.6.2/config/hal.c
===================================================================
--- xorg-server-1.6.2.orig/config/hal.c
+++ xorg-server-1.6.2/config/hal.c
@@ -506,7 +506,12 @@ connect_and_register(DBusConnection *con
 
     devices = libhal_find_device_by_capability(info->hal_ctx, "input",
                                                &num_devices, &error);
+    if (dbus_error_is_set(&error)) {
     /* FIXME: Get default devices if error is set. */
+        LogMessage(X_ERROR, "config/hal: couldn't find input device: %s (%s)\n",
+               error.name, error.message);
+        goto out_ctx2;
+    }
     for (i = 0; i < num_devices; i++)
         device_added(info->hal_ctx, devices[i]);
     libhal_free_string_array(devices);
@@ -516,10 +521,12 @@ connect_and_register(DBusConnection *con
     return TRUE;
 
 out_ctx2:
+    dbus_error_free(&error);
     if (!libhal_ctx_shutdown(info->hal_ctx, &error))
         LogMessage(X_WARNING, "config/hal: couldn't shut down context: %s (%s)\n",
                error.name, error.message);
 out_ctx:
+    dbus_error_free(&error);
     libhal_ctx_free(info->hal_ctx);
 out_err:
     dbus_error_free(&error);