New submission from Amaury Forgeot d'Arc:

This segfaults on all Python versions:
  io.BufferedRWPair.__new__(io.BufferedRWPair).read()

The various "_forward_call" methods should check that the reader and writer 
objects are correctly initialized. Not NULL, at the very least.

----------
components: IO
messages: 186360
nosy: amaury.forgeotdarc, pitrou
priority: normal
severity: normal
status: open
title: io.BufferedRWPair can use uninitialized members
type: crash
versions: Python 2.7, Python 3.3, Python 3.4

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue17671>
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