New submission from Michael Forney <mfor...@mforney.org>:
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 <rep...@bugs.python.org> <https://bugs.python.org/issue44172> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
