static void init_sasl_conn(conn *c) {
    assert(c);
    /* should something else be returned? */
    if (!settings.sasl)
        return;

    if (!c->sasl_conn) {
        int result=sasl_server_new("memcached",
                                   NULL, NULL, NULL, NULL,
                                   NULL, 0, &c->sasl_conn);
        if (result != SASL_OK) {
            if (settings.verbose) {
                fprintf(stderr, "Failed to initialize SASL conn.\n");
            }
            c->sasl_conn = NULL;
        }
    }
}

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.