[issue3311] block operation on closed socket/pipe for multiprocessing

[STINNER Victor]

New submission from STINNER Victor <haypo at users.sourceforge.net>:

_multiprocessing Connection methods don't check if handle is valid or 
not. If you close the socket/pipe, Python may crash on operations, 
especially in poll() on FD_SET(...handle, &rdfs).

Example of crash:
----------------------
import _multiprocessing
obj = _multiprocessing.Connection(755)
obj.close()
obj.poll()
----------------------

Attached patch is a proposition of fix to check handle in all 
Connection methods using the handle.

----------
components: Library (Lib)
files: multiprocessing_closed.patch
keywords: patch
messages: 69365
nosy: haypo
severity: normal
status: open
title: block operation on closed socket/pipe for multiprocessing
versions: Python 2.6
Added file: http://bugs.python.org/file10838/multiprocessing_closed.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue3311>
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