Index: krb5-1.8.1/src/kdc/do_as_req.c
===================================================================
--- krb5-1.8.1.orig/src/kdc/do_as_req.c
+++ krb5-1.8.1/src/kdc/do_as_req.c
@@ -784,6 +784,8 @@ prepare_error_as (struct kdc_request_sta
                     pad->contents = td[size]->data;
                     pad->length = td[size]->length;
                     pa[size] = pad;
+                    td[size]->data = NULL;
+                    td[size]->length = 0;
                 }
             krb5_free_typed_data(kdc_context, td);
         }