Missing error handling in _PyEval_GetFrameLocals in ceval.c

[sobolevn]

Bug report

Here's the problematic code:

cpython/Python/ceval.c

Lines 2497 to 2504 in d8d9491

	if (PyFrameLocalsProxy_Check(locals)) {
	PyObject* ret = PyDict_New();
	if (PyDict_Update(ret, locals)) {
	Py_DECREF(ret);
	return NULL;
	}
	Py_DECREF(locals);
	return ret;

What's wrong?

1. PyDict_New() can return NULL, it is not checked
2. Py_DECREF(locals); is only called on success, but not on error

Refs b034f14

I have a PR ready.

Linked PRs

• gh-118613: Fix error handling of _PyEval_GetFrameLocals in ceval.c #118614