pythongh-101892 : Updated Cython/objects/iterobject.c Line 217

Author: workingpayload

Objects/iterobject.c

@@ -214,15 +214,14 @@ calliter_iternext(calliterobject *it)
     }
 
     result = _PyObject_CallNoArgs(it->it_callable);
-    if (result != NULL && it->it_callable != NULL) {
+    if (result != NULL && it->it_sentinel != NULL){
         int ok;
 
         ok = PyObject_RichCompareBool(it->it_sentinel, result, Py_EQ);
         if (ok == 0) {
             return result; /* Common case, fast path */
         }
 
-        Py_DECREF(result);
         if (ok > 0) {
             Py_CLEAR(it->it_callable);
             Py_CLEAR(it->it_sentinel);
@@ -233,6 +232,7 @@ calliter_iternext(calliterobject *it)
         Py_CLEAR(it->it_callable);
         Py_CLEAR(it->it_sentinel);
     }
+    Py_XDECREF(result);
     return NULL;
 }