=== modified file 'grub-core/disk/diskfilter.c'
--- grub-core/disk/diskfilter.c	2012-01-29 13:28:01 +0000
+++ grub-core/disk/diskfilter.c	2012-02-03 18:21:07 +0000
@@ -837,6 +837,9 @@ grub_diskfilter_make_raid (grub_size_t u
     case 6:
       totsize = (nmemb - level / 3) * disk_size;
       break;
+
+    default:
+      return NULL;
     }
 
   array = grub_diskfilter_get_vg_by_uuid (uuidlen, uuid);