static int check_id(X509_STORE_CTX *ctx)
{
    X509_VERIFY_PARAM *vpm = ctx->param;
    X509_VERIFY_PARAM_ID *id = vpm->id;
    X509 *x = ctx->cert;
    if (id->hosts && check_hosts(x, id) <= 0) {
        if (!check_id_error(ctx, X509_V_ERR_HOSTNAME_MISMATCH))
            return 0;
    }
    if (id->email && X509_check_email(x, id->email, id->emaillen, 0) <= 0) {
        if (!check_id_error(ctx, X509_V_ERR_EMAIL_MISMATCH))
            return 0;
    }
    if (id->ip && X509_check_ip(x, id->ip, id->iplen, 0) <= 0) {
        if (!check_id_error(ctx, X509_V_ERR_IP_ADDRESS_MISMATCH))
            return 0;
    }
    return 1;
}

The product dereferences a pointer that it expects to be valid but is NULL.