(handle_v4): make sure length is longer then 2,

Pointed out by Evgeny Demidov <demidov@gleg.net>


git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@13827 ec53bebd-3082-4978-b11e-865c3cabbd6b

kadmin/version4.c

@@ -965,6 +965,8 @@ handle_v4(krb5_context context,
 	if(term_flag)
 	    exit(0);
 	if(first) {
+	    if (len < 2)
+		krb5_errx(context, 1, "received too short len (%d < 2)", len);
 	    /* first time around, we have already read len, and two
                bytes of the version string */
 	    krb5_data_alloc(&message, len);