[New-bugs-announce] [issue31577] crash in os.utime() in case of a bad ns argument

[Oren Milman]

New submission from Oren Milman:

The following code causes the interpreter to crash:
class BadInt:
    def __divmod__(*args):
        return 42

import os
os.utime('foo.txt', ns=(BadInt(), 1))


This is because split_py_long_to_s_and_ns() (in Modules/posixmodule.c) assumes
that PyNumber_Divmod() returns a 2-tuple, and passes it to PyTuple_GET_ITEM(),
which assumes it is a tuple. Thus, PyTuple_GET_ITEM() might return a non-NULL
value which is not an address of a Python object.

----------
components: Extension Modules
messages: 302962
nosy: Oren Milman
priority: normal
severity: normal
status: open
title: crash in os.utime() in case of a bad ns argument
type: crash
versions: Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31577>
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