patch: fix CVE-2019-20633
* CVE detail: https://nvd.nist.gov/vuln/detail/CVE-2019-20633
* upstream tracking: https://savannah.gnu.org/bugs/index.php?56683
* Fixes potential for double free after incomplete fix for CVE-2018-6952
- src/pch.c (another_hunk): Avoid invalid memory access in context format
diffs.
Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit
be71dd2cc16a4c0d244a76a748f08ca0d9bfeba0)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
