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[3.8] bpo-38400 Don't check for NULL linked list pointers in _PyObject_IsFreed (GH-16630) #18072

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Merged
miss-islington merged 1 commit into from
Jan 19, 2020
Merged

[3.8] bpo-38400 Don't check for NULL linked list pointers in _PyObject_IsFreed (GH-16630) #18072

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5 changes: 4 additions & 1 deletion Objects/object.c
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Original file line number Diff line number Diff line change
Expand Up @@ -454,9 +454,12 @@ _PyObject_IsFreed(PyObject *op)
/* ignore op->ob_ref: its value can have be modified
by Py_INCREF() and Py_DECREF(). */
#ifdef Py_TRACE_REFS
if (_PyMem_IsPtrFreed(op->_ob_next) || _PyMem_IsPtrFreed(op->_ob_prev)) {
if (op->_ob_next != NULL && _PyMem_IsPtrFreed(op->_ob_next)) {
return 1;
}
if (op->_ob_prev != NULL && _PyMem_IsPtrFreed(op->_ob_prev)) {
return 1;
}
#endif
return 0;
}
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