GNU bug report logs - #25390
Segfault with sed 4.3

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Norihiro Tanaka <noritnk <at> kcn.ne.jp>
Cc: 25390 <at> debbugs.gnu.org, Assaf Gordon <assafgordon <at> gmail.com>, Gnulib bugs <bug-gnulib <at> gnu.org>, "S. Gilles" <sgilles <at> math.umd.edu>, GNU grep developers <grep-devel <at> gnu.org>
Subject: bug#25390: Segfault with sed 4.3
Date: Sun, 8 Jan 2017 22:12:02 -0800

Norihiro Tanaka wrote:
> I wrote two additional patches for dfa.  First, derive number of
> allocation from not argument but number of state in transition table
> allocation.  Second, melt down dfastate() into build_state().  Now, I
> think that there do not have to be separated.

Thanks, I installed those two patches into Gnulib.

> I also wrote a simple test, but the issue are not always caused, as it
> depends on state of memory.  Should we rely to complate the test on
> valgrind?

Yes, I expect the 'sed' folks would prefer the test to use valgrind. You can 
look at testsuite/invalid-mb-seq-UMR.sh for an example of a test that does that.

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