[ python-Bugs-1086603 ] segfault in readline

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Bugs item #1086603, was opened at 2004-12-16 18:02
Message generated for change (Comment added) made by mwh
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Category: Python Library
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: DSM (dsm001)
Assigned to: Nobody/Anonymous (nobody)
Summary: segfault in readline

Initial Comment:
It's possible to produce segfaults using two functions
from the
readline module by giving them negative values (GNU
readline 4.3-10),
at least in some circumstances.  

Python 2.5a0 (#10, Dec 15 2004, 19:53:33) 
[GCC 3.3.3 (Debian 20040401)] on linux2
Type "help", "copyright", "credits" or "license" for
more information.
>>> import readline
[25290 refs]
>>> readline.remove_history_item(-1)
Segmentation fault

>>> readline.replace_history_item(-1,'abc')
Segmentation fault

gdb reveals it happens because the (external)
remove_history and replace_history_entry don't return
NULL in these cases.  I'm not sure whether we're
responsible for checking the sanity of inputs or the
GNU code should be returning NULL and isn't, but at
least sometimes it doesn't.

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>Comment By: Michael Hudson (mwh)
Date: 2004-12-19 16:41

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Do you want to fix it then? :)  I can't imagine it's that hard, but it would 
be easier for someone who can test that their fix helps...

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Comment By: George Yoshida (quiver)
Date: 2004-12-18 10:45

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FYI, I can reproduce this with :

- Python 2.4 & readline 4.3 under SuSE 9.1
- Python 2.5(snapshot as of 2004-12-17) & readline 4.3 under 
SuSE 9.1
- Python 2.4 & readline 4.3.5(?) under Cygwin



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Comment By: Michael Hudson (mwh)
Date: 2004-12-17 14:18

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Hmm.  I can't reproduce this (also with readline 4.3).  Odd.

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