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bpo-35059: Cleanup load_extension() of _pickle.c #10647

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bpo-35059: Cleanup load_extension() of _pickle.c #10647

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26 changes: 19 additions & 7 deletions Modules/_pickle.c
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Original file line number Diff line number Diff line change
Expand Up @@ -5858,14 +5858,20 @@ load_extension(UnpicklerObject *self, int nbytes)
/* Since the extension registry is manipulable via Python code,
* confirm that pair is really a 2-tuple of strings.
*/
if (!PyTuple_Check(pair) || PyTuple_Size(pair) != 2 ||
!PyUnicode_Check(module_name = PyTuple_GET_ITEM(pair, 0)) ||
!PyUnicode_Check(class_name = PyTuple_GET_ITEM(pair, 1))) {
Py_DECREF(py_code);
PyErr_Format(PyExc_ValueError, "_inverted_registry[%ld] "
"isn't a 2-tuple of strings", code);
return -1;
if (!PyTuple_Check(pair) || PyTuple_Size(pair) != 2) {
goto error;
}

module_name = PyTuple_GET_ITEM(pair, 0);
if (!PyUnicode_Check(module_name)) {
goto error;
}

class_name = PyTuple_GET_ITEM(pair, 1);
if (!PyUnicode_Check(class_name)) {
goto error;
}

/* Load the object. */
obj = find_class(self, module_name, class_name);
if (obj == NULL) {
Expand All @@ -5881,6 +5887,12 @@ load_extension(UnpicklerObject *self, int nbytes)
}
PDATA_PUSH(self->stack, obj, -1);
return 0;

error:
Py_DECREF(py_code);
PyErr_Format(PyExc_ValueError, "_inverted_registry[%ld] "
"isn't a 2-tuple of strings", code);
return -1;
}

static int
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