krb5 kadmind uninitialized pointer

The kadm5modifypolicyinternal function in lib/kadm5/srv/svrpolicy.c in the Kerberos administration daemon kadmind in MIT Kerberos 5 krb5 1.5 through 1.6.2 does not properly check return values when the policy does not exist, which might allow remote authenticated users with the "modify policy"...