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gh-161863: Fix possible NULL deref in _PyErr_Display #161979

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gh-161863: Fix possible NULL deref in _PyErr_Display #161979

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7 changes: 7 additions & 0 deletions Python/pythonrun.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1157,6 +1157,13 @@ _PyErr_Display(PyObject *file, PyObject *unused, PyObject *value, PyObject *tb)
}
}

// gh-161863: Interpreter can be not fully initialized
// when calling this function. May be not safe to call the import.
PyInterpreterState *interp = _PyInterpreterState_GET();
if (interp->imports.importlib == NULL) {
goto fallback;
}

// Try first with the stdlib traceback module
PyObject *print_exception_fn = PyImport_ImportModuleAttrString(
"traceback",
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