GNU bug report logs - #25390
Segfault with sed 4.3

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Assaf Gordon <assafgordon <at> gmail.com>, "S. Gilles" <sgilles <at> math.umd.edu>
Cc: 25390 <at> debbugs.gnu.org, Gnulib bugs <bug-gnulib <at> gnu.org>, GNU grep developers <grep-devel <at> gnu.org>
Subject: bug#25390: Segfault with sed 4.3
Date: Sun, 8 Jan 2017 12:49:42 -0800

[Message part 1 (text/plain, inline)]

Assaf Gordon wrote:
> The immediate cause is somewhere in gnulib's DFA module.

The bug was introduced in Gnulib, in commit 
403adf1b40897ba108075008c10bd38d937e1539 dated 2016-11-25 and labeled "dfa: 
addition of new state on demand". It's not a bug that grep runs into, since grep 
doesn't use the newline transition that sed does. I installed the attached patch 
to fix the Gnulib bug. I'll leave Bug#25390 open, as I assume you'll want to 
check it for 'sed' and add a test case for 'sed'.

[0001-dfa-fix-reallocation-bug-when-matching-newlines.patch (text/x-diff, attachment)]

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