[issue23228] Crashes when tarfile contains a symlink and unpack directory contain it too

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


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nosy: +lars.gustaebel, serhiy.storchaka
stage:  -> patch review
versions: +Python 2.7, Python 3.4, Python 3.5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23228>
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