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Re: [PATCH] 4.0..devel: fix a problem that unset 'a[`echo 0`]' causes "b

From: Chet Ramey
Subject: Re: [PATCH] 4.0..devel: fix a problem that unset 'a[`echo 0`]' causes "bad array subscript" error
Date: Wed, 6 Oct 2021 10:12:04 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:91.0) Gecko/20100101 Thunderbird/91.1.2

On 10/5/21 10:48 PM, Koichi Murase wrote:
> [ I initially intended to submit this report after the previous report
> at https://lists.gnu.org/archive/html/bug-bash/2021-10/msg00051.html
> has been settled.  I decided to submit this patch now because a
> problem related to this report is mentioned in the above thread.  Note
> that this patch bases on the code after applying the patches provided
> at the previous report. ]>
> Bash Version:
>   All the versions from 4.0 to devel are affected.  The problem should
>   be reproduced independent of the machine type.
> Description:
>   « unset -v 'a[`echo 0`]' » fails because the first character « ` »
>   of the subscript « `echo 0` » is skipped when checking the ending of
>   the array subscript.

Thanks for the comprehensive report and fix.

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

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