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Re: global-buffer-overflow in parse.y

From: Chet Ramey
Subject: Re: global-buffer-overflow in parse.y
Date: Mon, 6 Mar 2023 09:16:12 -0500
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:102.0) Gecko/20100101 Thunderbird/102.8.0

On 3/3/23 2:22 AM, Grisha Levit wrote:
$ ./bash -c 'case x in x) if ((1)); then :; fi ;; esac'
parse.y:974:82: runtime error: index -1 out of bounds for type 'int[257]'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior parse.y:974:82 in
==52960==ERROR: AddressSanitizer: global-buffer-overflow
READ of size 4 at 0x000100cf26dc thread T0
     #0 0x1004b63c8 in yyparse parse.y:974

Thanks for the report. It's the specific combination of `if' and the `(('
command that causes the problem.


``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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