From: Ralph Corderoy <ralph@inputplus.co.uk>
Date: Tue, 23 Jan 2018 09:18:34 +0000 (+0000)
Subject: mhshow: Avoid SEGV when user's command has two or fewer words.
X-Git-Url: https://diplodocus.org/git/nmh/commitdiff_plain/20fdce3e9137be985ffb22a2c97c51bcd45f72e0?hp=20fdce3e9137be985ffb22a2c97c51bcd45f72e0

mhshow: Avoid SEGV when user's command has two or fewer words.

After argsplit() returned a NULL-terminated vector, the existing NULL
was overwritten with another and the vector index then incremented.
This made the test for whether vec[2] was available out by one resulting
in NULL being used and printed.

This plucking of the third word is a faulty assumption as argsplit()
doesn't always return ["sh", "-c", ...], but add a new test script for
it to avoid regression and so that the script can be expanded with more
related tests.

Fixes 7559e1ebf.
---