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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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Python/bltinmodule.c
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@ -168,8 +168,7 @@ builtin___build_class__(PyObject *self, PyObject *const *args, Py_ssize_t nargs,
goto error;
}
if (winner != meta) {
Py_DECREF(meta);
meta = Py_NewRef(winner);
Py_SETREF(meta, Py_NewRef(winner));
}
}
/* else: meta is not a class, so we cannot do the metaclass