g_object_set_data 有记忆漏洞

Question

我正在制作一个 GTK3 应用程序，我在 GtkListBoxRow 上使用 g_object_set_qdata 进行搜索。

我使用这个代码：

GArray      *complib;
#define row_get_entry(row) (ElcCompLibEntry*)g_object_get_qdata(G_OBJECT(row),registryquark)
GtkWidget* elc_registry_listbox_make_item(ElcCompLibEntry* curritem)
{
  /* I remove UI creation */
  GtkWidget* intermediate = gtk_list_box_row_new();
  gtk_container_add(GTK_CONTAINER(intermediate),GTK_WIDGET(mainbox));
  gtk_widget_show_all(GTK_WIDGET(intermediate));
  g_object_set_qdata(G_OBJECT(intermediate),registryquark,curritem);
  return intermediate;
};
  static GtkWidget* saved = NULL;
  GtkWidget* new=elc_registry_listbox_make_item(entry);
  gtk_container_add(GTK_CONTAINER(listbox->real_listbox),new);
  if (saved)
    g_debug("saved entry is at position %d",((gintptr)row_get_entry(saved)-(gintptr)complib->data)/sizeof(ElcCompLibEntry));
  saved=new;
  g_debug("entry is at position %d",((gintptr)row_get_entry(new)-(gintptr)complib->data)/sizeof(ElcCompLibEntry));

我程序的输出：

** (elc:9906): DEBUG: 18:51:10.623: entry is at position 0

** (elc:9906): DEBUG: 18:51:10.625: saved entry is at position -14015
** (elc:9906): DEBUG: 18:51:10.625: entry is at position 1

** (elc:9906): DEBUG: 18:51:10.627: saved entry is at position 32
** (elc:9906): DEBUG: 18:51:10.627: entry is at position 2

** (elc:9906): DEBUG: 18:51:10.629: saved entry is at position 2
** (elc:9906): DEBUG: 18:51:10.629: entry is at position 3

** (elc:9906): DEBUG: 18:51:10.631: saved entry is at position 25921
** (elc:9906): DEBUG: 18:51:10.631: entry is at position 4

ElcCompLibEntry 是一个简单的结构。 g_object_set_qdata_full 只是破坏旧数据，夸克被初始化，即使运行它在主线程中我得到相同的结果（只有 saved entry is at position 2 是常量）。

谁能帮我找到问题的根源and/or 发给我相关文档？

感谢您的宝贵时间！

Answer 1

根据 https://developer.gnome.org/glib/stable/glib-Arrays.html#GArray、

The data may be moved as elements are added to the GArray.

如果没有看到创建和追加到 complib 的代码，很难说清楚，但是 complib->data 不是常量，当调整数组大小时，存储在 qdata 中的指针可能会失效。

为防止出现这种情况，请尝试使用g_array_sized_new() 预先分配您需要的元素数量来创建数组。

g_object_set_data 有记忆漏洞

g_object_set_data has memory holes

glib

gtk3