static void read_fstree(void *fdt, const char *dirname)
{
    DIR *d;
    struct dirent *de;
    struct stat st;
    const char *root_dir = SYSFS_DT_BASEDIR;
    const char *parent_node;

    if (strstr(dirname, root_dir) != dirname) {
        error_report("%s: %s must be searched within %s",
                     __func__, dirname, root_dir);
        exit(1);
    }
    parent_node = &dirname[strlen(SYSFS_DT_BASEDIR)];

    d = opendir(dirname);
    if (!d) {
        error_report("%s cannot open %s", __func__, dirname);
        exit(1);
    }

    while ((de = readdir(d)) != NULL) {
        char *tmpnam;

        if (!g_strcmp0(de->d_name, ".")
            || !g_strcmp0(de->d_name, "..")) {
            continue;
        }

        tmpnam = g_strdup_printf("%s/%s", dirname, de->d_name);

        if (lstat(tmpnam, &st) < 0) {
            error_report("%s cannot lstat %s", __func__, tmpnam);
            exit(1);
        }

        if (S_ISREG(st.st_mode)) {
            gchar *val;
            gsize len;

            if (!g_file_get_contents(tmpnam, &val, &len, NULL)) {
                error_report("%s not able to extract info from %s",
                             __func__, tmpnam);
                exit(1);
            }

            if (strlen(parent_node) > 0) {
                qemu_fdt_setprop(fdt, parent_node,
                                 de->d_name, val, len);
            } else {
                qemu_fdt_setprop(fdt, "/", de->d_name, val, len);
            }
            g_free(val);
        } else if (S_ISDIR(st.st_mode)) {
            char *node_name;

            node_name = g_strdup_printf("%s/%s",
                                        parent_node, de->d_name);
            qemu_fdt_add_subnode(fdt, node_name);
            g_free(node_name);
            read_fstree(fdt, tmpnam);
        }

        g_free(tmpnam);
    }

    closedir(d);
}

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.