New submission from Michael Forney :
When subwin() is used to create a subwindow for an original window, it does not
keep a reference to the original window object. This can result in the original
window getting deleted with delwin() before the subwindow.
According to the X/Open curses specification[0]:
> The application must delete subwindows before deleting the main window.
This is also mentioned in the ncurses documentation[1]:
> Subwindows must be deleted before the main window can be deleted.
When building the Python curses module against NetBSD's curses implementation,
deleting the windows in the wrong order causes a double-free. This results in
hanging or crashing when running test_curses.
To fix this, window objects for subwindows should keep a reference to the
original window object.
[0] https://pubs.opengroup.org/onlinepubs/7908799/xcurses/delwin.html
[1] https://invisible-island.net/ncurses/man/curs_window.3x.html
--
components: Extension Modules
messages: 393916
nosy: michaelforney
priority: normal
severity: normal
status: open
title: curses module may call delwin() on original window before subwindows
type: crash
versions: Python 3.10, Python 3.11, Python 3.6, Python 3.7, Python 3.8, Python
3.9
___
Python tracker
<https://bugs.python.org/issue44172>
___
___
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
