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[3.11] GH-99729: Unlink frames before clearing them (#100047)

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Brandt Bucher 2022-12-06 09:02:19 -08:00 • committed by GitHub
parent 3fae04b10e
commit 2182a71eed
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4 changed files with 56 additions and 10 deletions
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Python/frame.c
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@ -123,6 +123,9 @@ _PyFrame_Clear(_PyInterpreterFrame *frame)
* to have cleared the enclosing generator, if any. */
assert(frame->owner != FRAME_OWNED_BY_GENERATOR ||
_PyFrame_GetGenerator(frame)->gi_frame_state == FRAME_CLEARED);
// GH-99729: Clearing this frame can expose the stack (via finalizers). It's
// crucial that this frame has been unlinked, and is no longer visible:
assert(_PyThreadState_GET()->cframe->current_frame != frame);
if (frame->frame_obj) {
PyFrameObject *f = frame->frame_obj;
frame->frame_obj = NULL;