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gh-99240: Reset pointer to NULL when the pointed memory is freed in argument parsing #99890

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Merged
merged 9 commits into from
Dec 17, 2022
Merged

gh-99240: Reset pointer to NULL when the pointed memory is freed in argument parsing #99890

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9271e85
Reset pointer to NULL when memory is freed
colorfulappl Nov 30, 2022
eba62a3
Add news
colorfulappl Nov 30, 2022
39895ee
Remove unnecessary null-check
colorfulappl Dec 14, 2022
ef866b2
Add test
colorfulappl Dec 15, 2022
357576b
Fix an error
colorfulappl Dec 16, 2022
0424701
PyMem_FREE -> PyMem_Free
kumaraditya303 Dec 16, 2022
4a7d386
Update Modules/_testcapi/getargs.c
kumaraditya303 Dec 16, 2022
1d3b069
Merge branch 'main' into clear_freed_pointer
kumaraditya303 Dec 16, 2022
6e9744c
Update Modules/_testcapi/getargs.c
erlend-aasland Dec 16, 2022
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Add test
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@colorfulappl
colorfulappl committed Dec 15, 2022
commit ef866b2e1531135b709f162bf5dae6633e3990f6
4 changes: 4 additions & 0 deletions Lib/test/test_capi/test_getargs.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1085,6 +1085,10 @@ def test_Z_hash(self):
with self.assertWarns(DeprecationWarning):
self.assertIsNone(getargs_Z_hash(None))

def test_gh_99240_clear_args(self):
from _testcapi import gh_99240_clear_args
self.assertRaises(TypeError, gh_99240_clear_args, 'a', '\0b')


class Object_TestCase(unittest.TestCase):
def test_S(self):
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18 changes: 18 additions & 0 deletions Modules/_testcapi/getargs.c
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Expand Up @@ -854,6 +854,23 @@ getargs_s_hash_int2(PyObject *self, PyObject *args, PyObject *kwargs)
Py_RETURN_NONE;
}

static PyObject *
gh_99240_clear_args(PyObject *self, PyObject *args) {
char *a = NULL;
char *b = NULL;

if (!PyArg_ParseTuple(args, "eses", "idna", &a, "idna", &b)) {
if (a || b) {
PyErr_Clear();
PyErr_SetString(PyExc_AssertionError, "Arguments is not cleared.");
}
return NULL;
}
Py_DECREF(a);
Py_DECREF(b);
Py_RETURN_NONE;
}

static PyMethodDef test_methods[] = {
{"get_args", get_args, METH_VARARGS},
{"get_kwargs", _PyCFunction_CAST(get_kwargs), METH_VARARGS|METH_KEYWORDS},
Expand Down Expand Up @@ -906,6 +923,7 @@ static PyMethodDef test_methods[] = {
{"test_empty_argparse", test_empty_argparse, METH_NOARGS},
{"test_k_code", test_k_code, METH_NOARGS},
{"test_s_code", test_s_code, METH_NOARGS},
{"gh_99240_clear_args", gh_99240_clear_args, METH_VARARGS},
{NULL},
};

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