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gh-99537: Use Py_SETREF() function in C code (#99656)

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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 14:22:22 +01:00 • committed by GitHub
parent 135ec7cefb
commit 7e3f09cad9
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20 changed files with 37 additions and 89 deletions
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Modules/_tkinter.c
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@ -1105,8 +1105,7 @@ fromBignumObj(TkappObject *tkapp, Tcl_Obj *value)
PyMem_Free(bytes);
if (res != NULL && bigValue.sign == MP_NEG) {
PyObject *res2 = PyNumber_Negative(res);
Py_DECREF(res);
res = res2;
Py_SETREF(res, res2);
}
mp_clear(&bigValue);
return res;