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[3.11] GH-97752: Clear the previous member of newly-created generator/coroutine frames (GH-97812)

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(cherry picked from commit 93fcc1f413)
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Miss Islington (bot) 2022-10-03 21:03:26 -07:00 • committed by GitHub
parent 0e3a046b48
commit 4591dae421
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Python/frame.c
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@ -52,6 +52,9 @@ _PyFrame_Copy(_PyInterpreterFrame *src, _PyInterpreterFrame *dest)
assert(src->stacktop >= src->f_code->co_nlocalsplus);
Py_ssize_t size = ((char*)&src->localsplus[src->stacktop]) - (char *)src;
memcpy(dest, src, size);
// Don't leave a dangling pointer to the old frame when creating generators
// and coroutines:
dest->previous = NULL;
}