prepare_error_tgs (struct kdc_request_state *state,
                   krb5_kdc_req *request, krb5_ticket *ticket, int error,
                   krb5_principal canon_server,
                   krb5_data **response, const char *status,
                   krb5_pa_data **e_data)
{
    krb5_error errpkt;
    krb5_error_code retval = 0;
    krb5_data *scratch, *e_data_asn1 = NULL, *fast_edata = NULL;

    errpkt.ctime = request->nonce;
    errpkt.cusec = 0;

    if ((retval = krb5_us_timeofday(kdc_context, &errpkt.stime,
                                    &errpkt.susec)))
        return(retval);
    errpkt.error = error;
    errpkt.server = request->server;
    if (ticket && ticket->enc_part2)
        errpkt.client = ticket->enc_part2->client;
    else
        errpkt.client = NULL;
    errpkt.text.length = strlen(status);
    if (!(errpkt.text.data = strdup(status)))
        return ENOMEM;

    if (!(scratch = (krb5_data *)malloc(sizeof(*scratch)))) {
        free(errpkt.text.data);
        return ENOMEM;
    }

    if (e_data != NULL) {
        retval = encode_krb5_padata_sequence(e_data, &e_data_asn1);
        if (retval) {
            free(scratch);
            free(errpkt.text.data);
            return retval;
        }
        errpkt.e_data = *e_data_asn1;
    } else
        errpkt.e_data = empty_data();

    if (state) {
        retval = kdc_fast_handle_error(kdc_context, state, request, e_data,
                                       &errpkt, &fast_edata);
    }
    if (retval) {
        free(scratch);
        free(errpkt.text.data);
        krb5_free_data(kdc_context, e_data_asn1);
        return retval;
    }
    if (fast_edata)
        errpkt.e_data = *fast_edata;
    retval = krb5_mk_error(kdc_context, &errpkt, scratch);
    free(errpkt.text.data);
    krb5_free_data(kdc_context, e_data_asn1);
    krb5_free_data(kdc_context, fast_edata);
    if (retval)
        free(scratch);
    else
        *response = scratch;

    return retval;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.