* src/ber-help.h (MAX_CRL_NUMBER_LENGTH): New.
(MAX_NAME_URL_LENGTH): New.
* src/crl.c (ksba_crl_get_auth_key_id): Error out if the length is
  larger that a given limit.
(ksba_crl_get_crl_number): Ditto.
(parse_crl_entry): Ditto.
* src/name.c (_ksba_name_new_from_der): Ditto.
* src/ocsp.c (ksba_ocsp_get_responder_id): Ditto.