[issue3367] Uninitialized value read in parsetok.c

[Kristján Valur Jónsson]

New submission from Kristján Valur Jónsson <kristjan at ccpgames.com>:

If a PyTokenizer_FromString() is called with an empty string, the 
tokenizer's line_start member never gets initialized.  Later, it is 
compared with the token pointer 'a' in parsetok.c:193 and that behavior 
can result in undefined behavior.
Found using Rational Purify for windows.
A patch is provided.

----------
files: tmp1.patch
keywords: easy, patch, patch
messages: 69714
nosy: krisvale
severity: normal
status: open
title: Uninitialized value read in parsetok.c
type: crash
versions: Python 2.5, Python 2.6
Added file: http://bugs.python.org/file10898/tmp1.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue3367>
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