New submission from STINNER Victor <[email protected]>:
C extensions written for Python 3.10 and older which access directly to the
PyFrameObject.f_back member build successfully on Python 3.11, but they can
fail because f_back must not be read directly. f_back can be NULL even if the
frame has an outer frame.
PyFrameObject*
PyFrame_GetBack(PyFrameObject *frame)
{
assert(frame != NULL);
PyFrameObject *back = frame->f_back;
if (back == NULL && frame->f_frame->previous != NULL) {
back = _PyFrame_GetFrameObject(frame->f_frame->previous);
}
Py_XINCREF(back);
return back;
}
I suggest to remove or "hide" this member from the structure. For example,
rename "f_back" to "_f_back" to advice developers to not access it directly.
See also bpo-46355: Document PyFrameObject and PyThreadState changes.
----------
components: C API
messages: 410403
nosy: Mark.Shannon, vstinner
priority: normal
severity: normal
status: open
title: [C API] Enforce usage of PyFrame_GetBack()
versions: Python 3.11
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Python tracker <[email protected]>
<https://bugs.python.org/issue46356>
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