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bpo-45963: Fix leak when an exception is raised during generator creation. #29960

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Dec 7, 2021
Merged

bpo-45963: Fix leak when an exception is raised during generator creation. #29960

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27 changes: 7 additions & 20 deletions Python/ceval.c
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Original file line number Diff line number Diff line change
Expand Up @@ -5854,24 +5854,6 @@ initialize_locals(PyThreadState *tstate, PyFunctionObject *func,
return -1;
}

static int
initialize_coro_frame(InterpreterFrame *frame, PyThreadState *tstate,
PyFunctionObject *func, PyObject *locals,
PyObject *const *args, Py_ssize_t argcount,
PyObject *kwnames)
{
assert(is_tstate_valid(tstate));
assert(func->func_defaults == NULL || PyTuple_CheckExact(func->func_defaults));
PyCodeObject *code = (PyCodeObject *)func->func_code;
_PyFrame_InitializeSpecials(frame, func, locals, code->co_nlocalsplus);
for (int i = 0; i < code->co_nlocalsplus; i++) {
frame->localsplus[i] = NULL;
}
assert(frame->frame_obj == NULL);
return initialize_locals(tstate, func, frame->localsplus, args, argcount, kwnames);
}


/* Consumes all the references to the args */
static PyObject *
make_coro(PyThreadState *tstate, PyFunctionObject *func,
Expand All @@ -5885,12 +5867,17 @@ make_coro(PyThreadState *tstate, PyFunctionObject *func,
return NULL;
}
InterpreterFrame *frame = (InterpreterFrame *)((PyGenObject *)gen)->gi_iframe;
if (initialize_coro_frame(frame, tstate, func, locals, args, argcount, kwnames)) {
PyCodeObject *code = (PyCodeObject *)func->func_code;
_PyFrame_InitializeSpecials(frame, func, locals, code->co_nlocalsplus);
for (int i = 0; i < code->co_nlocalsplus; i++) {
frame->localsplus[i] = NULL;
}
((PyGenObject *)gen)->gi_frame_valid = 1;
if (initialize_locals(tstate, func, frame->localsplus, args, argcount, kwnames)) {
Py_DECREF(gen);
return NULL;
}
frame->generator = gen;
((PyGenObject *)gen)->gi_frame_valid = 1;
return gen;
}

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