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Re: bug#25390: Segfault with sed 4.3

From: Paul Eggert
Subject: Re: bug#25390: Segfault with sed 4.3
Date: Sun, 8 Jan 2017 12:49:42 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1

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'.

Attachment: 0001-dfa-fix-reallocation-bug-when-matching-newlines.patch
Description: Text Data

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