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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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7
Python/errors.c
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@ -353,16 +353,13 @@ _PyErr_NormalizeException(PyThreadState *tstate, PyObject **exc,
if (fixed_value == NULL) {
goto error;
}
Py_DECREF(value);
value = fixed_value;
Py_SETREF(value, fixed_value);
}
/* If the class of the instance doesn't exactly match the
class of the type, believe the instance.
*/
else if (inclass != type) {
Py_INCREF(inclass);
Py_DECREF(type);
type = inclass;
Py_SETREF(type, Py_NewRef(inclass));
}
}
*exc = type;