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GH-97592: Fix crash in C remove_done_callback due to evil code by gvanrossum · Pull Request #97660 · python/cpython · GitHub
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GH-97592: Fix crash in C remove_done_callback due to evil code #97660

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Merged
gvanrossum merged 4 commits into from
Sep 30, 2022
Merged

GH-97592: Fix crash in C remove_done_callback due to evil code #97660

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GH-97592: Anticipate fut_callbacks being cleared by PyObject_RichComp…
gvanrossum Sep 28, 2022
00b9536
Add test
gvanrossum Sep 29, 2022
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@gvanrossum
gvanrossum committed Sep 29, 2022
commit 00b95363c1b045e1a9e8b52ad8aae95718bccd33
15 changes: 15 additions & 0 deletions Lib/test/test_asyncio/test_futures.py
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Original file line number Diff line number Diff line change
Expand Up @@ -832,6 +832,21 @@ def __eq__(self, other):

fut.remove_done_callback(evil())

def test_remove_done_callbacks_list_clear(self):
# see https://github.com/python/cpython/issues/97592 for details

fut = self._new_future()
fut.add_done_callback(str)

for _ in range(63):
fut.add_done_callback(id)

class evil:
def __eq__(self, other):
fut.remove_done_callback(other)

fut.remove_done_callback(evil())
Comment on lines +844 to +848

@CharlieZhao95 CharlieZhao95 Sep 30, 2022

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Class names should normally use the CapWords convention.

Suggested change
class evil:
def __eq__(self, other):
fut.remove_done_callback(other)
fut.remove_done_callback(evil())
class Evil:
def __eq__(self, other):
fut.remove_done_callback(other)
fut.remove_done_callback(Evil())

@CharlieZhao95 CharlieZhao95 Sep 30, 2022

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All callbacks added by fut.add_done_callback() will be cleared when calling fut.remove_done_callback(Evil()), but the return value will be the number of callbacks added last.

I'm not sure if we need to improve the return value of remove done callback further, the current changes are good enough to fix the crash. :)


def test_schedule_callbacks_list_mutation_1(self):
# see http://bugs.python.org/issue28963 for details

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