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gh-99537: Use Py_SETREF() function in C code (#99657)

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Fix potential race condition in code patterns:

* Replace "Py_DECREF(var); var = new;" with "Py_SETREF(var, new);"
* Replace "Py_XDECREF(var); var = new;" with "Py_XSETREF(var, new);"
* Replace "Py_CLEAR(var); var = new;" with "Py_XSETREF(var, new);"

Other changes:

* Replace "old = var; var = new; Py_DECREF(var)"
  with "Py_SETREF(var, new);"
* Replace "old = var; var = new; Py_XDECREF(var)"
  with "Py_XSETREF(var, new);"
* And remove the "old" variable.
This commit is contained in:
Victor Stinner 2022-11-22 13:39:11 +01:00 • committed by GitHub
parent 3db0a21f73
commit 135ec7cefb
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19 changed files with 34 additions and 76 deletions
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6
Objects/typeobject.c
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@ -5968,8 +5968,7 @@ object___dir___impl(PyObject *self)
else {
/* Copy __dict__ to avoid mutating it. */
PyObject *temp = PyDict_Copy(dict);
Py_DECREF(dict);
dict = temp;
Py_SETREF(dict, temp);
}
if (dict == NULL)
@ -9377,8 +9376,7 @@ super_getattro(PyObject *self, PyObject *name)
(See SF ID #743627) */
(su->obj == (PyObject *)starttype) ? NULL : su->obj,
(PyObject *)starttype);
Py_DECREF(res);
res = res2;
Py_SETREF(res, res2);
}
Py_DECREF(mro);