[issue29438] use after free in key sharing dict

[Xiang Zhang]

Xiang Zhang added the comment:

> if (was_shared && (cached = CACHED_KEYS(tp)) != NULL && cached != ((PyDictObject *)dict)->ma_keys)

+1 on this and I think the deletion should also use

if ((cached = CACHED_KEYS(tp) ！= NULL)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29438>
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