pgsql: Fix handling of previous password hooks in passwordcheck

From: Michael Paquier <michael(at)paquier(dot)xyz>
To: pgsql-committers(at)lists(dot)postgresql(dot)org
Subject: pgsql: Fix handling of previous password hooks in passwordcheck
Date: 2019-08-01 00:39:23
Message-ID: E1hsz7r-0001Du-KW@gemulon.postgresql.org
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Fix handling of previous password hooks in passwordcheck

When piling up loading of modules using check_password_hook_type,
loading passwordcheck would remove any trace of a previously-loaded
hook. Unloading the module would also cause previous hooks to be
entirely gone.

Reported-by: Rafael Castro
Author: Michael Paquier
Reviewed-by: Daniel Gustafsson
Discussion: https://postgr.es/m/15932-78f48f9ef166778c@postgresql.org
Backpatch-through: 9.4

Branch
------
REL9_4_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/eea28a3cb36951ee439288d8e400621ec301484f

Modified Files
--------------
contrib/passwordcheck/passwordcheck.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)

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