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gh-145681: do not deallocate list buffer in `_PyList_AsTupleAndClear` by KowalskiThomas · Pull Request #145680 · python/cpython · GitHub
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gh-145681: do not deallocate list buffer in _PyList_AsTupleAndClear #145680

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Merged
encukou merged 3 commits into from
Mar 12, 2026
Merged

gh-145681: do not deallocate list buffer in _PyList_AsTupleAndClear #145680

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5a4d8b8
fix: reset list allocated to 0
KowalskiThomas Mar 9, 2026
22cc928
refactor: only use SET_SIZE, don't touch buffer metadata
KowalskiThomas Mar 11, 2026
6fe0c5c
fix: do not call free_list_items
KowalskiThomas Mar 11, 2026
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fix: reset list allocated to 0
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@KowalskiThomas
KowalskiThomas committed Mar 9, 2026
commit 5a4d8b8a198e18d01f2e0d5b75568cfd17acfa6e
1 change: 1 addition & 0 deletions Objects/listobject.c
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Expand Up @@ -3260,6 +3260,7 @@ _PyList_AsTupleAndClear(PyListObject *self)
Py_ssize_t size = Py_SIZE(self);
self->ob_item = NULL;
Py_SET_SIZE(self, 0);
self->allocated = 0;

@sergey-miryanov sergey-miryanov Mar 9, 2026

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list_clear_impl has extra code if Py_GIL_DISABLED - should we include it here?

@KowalskiThomas KowalskiThomas Mar 9, 2026

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Thanks for the comment, there is a discussion on the issue right now but I'll keep that in mind when time comes.

ret = _PyTuple_FromArraySteal(items, size);
free_list_items(items, false);
Py_END_CRITICAL_SECTION();
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