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Re: Segmentation fault in expassign when PS1='$[U[0S]+=]'


From: Chet Ramey
Subject: Re: Segmentation fault in expassign when PS1='$[U[0S]+=]'
Date: Tue, 16 May 2017 16:37:57 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Thunderbird/52.1.0

On 5/15/17 3:58 PM, Eduardo Bustamante wrote:

> bash-4.4$ "$[U[0S]+=]"
> bash: 0S: value too great for base (error token is "0S")
> 
> It seems like the array index expression causes a longjmp in the
> second case, so it stops evaluating.
> 
> Found by fuzzing.
> 
> I think this might be similar to
> https://lists.gnu.org/archive/html/bug-bash/2017-05/msg00046.html
> (i.e. ``Segmentation fault in evalerror when xtrace and
> PS4='$[T[$]]'``)
> 
> I think the fix *may* be something like:

You're on the right track. Thanks for the report.

Chet

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/



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