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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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4
Objects/bytesobject.c
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@ -2109,9 +2109,7 @@ bytes_translate_impl(PyBytesObject *self, PyObject *table,
changed = 1;
}
if (!changed && PyBytes_CheckExact(input_obj)) {
Py_INCREF(input_obj);
Py_DECREF(result);
result = input_obj;
Py_SETREF(result, Py_NewRef(input_obj));
}
PyBuffer_Release(&del_table_view);
PyBuffer_Release(&table_view);