int qemu_read_default_config_files(bool userconfig)
{
    int ret;
    struct defconfig_file *f;

    for (f = default_config_files; f->filename; f++) {
        if (!userconfig && f->userconfig) {
            continue;
        }
        ret = qemu_read_config_file(f->filename);
        if (ret < 0 && ret != -ENOENT) {
            return ret;
        }
    }

    return 0;
}

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.