when an argument is a cell, set the local copy to NULL (see #17927)

1 files changed, 4 insertions, 8 deletions

diff --git a/Python/ceval.c b/Python/ceval.c
index d6dba56b3c..e211e4fcaa 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -3521,18 +3521,14 @@ PyEval_EvalCodeEx(PyObject *_co, PyObject *globals, PyObject *locals,
         if (co->co_cell2arg != NULL &&
             (arg = co->co_cell2arg[i]) != CO_CELL_NOT_AN_ARG) {
             c = PyCell_New(GETLOCAL(arg));
-            if (c == NULL)
-                goto fail;
-            /* Reference the cell from the argument slot, for super().
-               See typeobject.c. */
-            Py_INCREF(c);
-            SETLOCAL(arg, c);
+            /* Clear the local copy. */
+            SETLOCAL(arg, NULL);
         }
         else {
             c = PyCell_New(NULL);
-            if (c == NULL)
-                goto fail;
         }
+        if (c == NULL)
+            goto fail;
         SETLOCAL(co->co_nlocals + i, c);
     }
     for (i = 0; i < PyTuple_GET_SIZE(co->co_freevars); ++i) {