Issue 581080: Provoking infinite scanner loops (original) (raw)

This issue has been migrated to GitHub: https://github.com/python/cpython/issues/36890

classification

process

Created on 2002-07-13 19:32 by tim.peters, last changed 2022-04-10 16:05 by admin. This issue is now closed.

Messages (4)
msg11563 - (view)	Author: Tim Peters (tim.peters) *	Date: 2002-07-13 19:32
From c.l.py: """ From: Jane Austine Sent: Saturday, July 13, 2002 6:01 AM To: python-list@python.org Subject: sre.finditer break down: is this a bug? Newly added function sre.finditer and (matchedObject.)finditer break down and the system crushes on win32 when requested for next() after StopIteration. see: >> import sre >> fi=sre.finditer(r'\s','a b') >> fi.next() >> fi.next() >> fi.next() #system halts for ever. -- """ The semantics of the underlying calliterobject aren't clear to me in this endcase, and I've raised that issue on c.l.py. But regardless of how that's resolved, it's easy to provoke the bad behavior without using finditer, and that should be fixed: >>> import re >>> s = re.compile(r'\s').scanner >>> t = s('a b').search >>> t() <_sre.SRE_Match object at 0x00679F70> >>> t() >>> t() >>> t() and there it's hung.
msg11564 - (view)	Author: Tim Peters (tim.peters) *	Date: 2002-07-13 19:35
Logged In: YES user_id=31435 Oops -- I meant I raised the calliterobject issue on Python- Dev, not on c.l.py.
msg11565 - (view)	Author: Gustavo Niemeyer (niemeyer) *	Date: 2002-11-07 03:30
Logged In: YES user_id=7887 Fixed in the following CVS revisions: Misc/NEWS: 1.515->1.516 Modules/_sre.c: 2.84->2.85 Thank you, Tim!
msg11566 - (view)	Author: David Schnepper (dschnepper)	Date: 2003-04-22 21:30
Logged In: YES user_id=72348 This fix needs backporting to the release-maint22 branch