pgsql: Invalidate smgr_targblock in smgrrelease().

From: Thomas Munro <tmunro(at)postgresql(dot)org>
To: pgsql-committers(at)lists(dot)postgresql(dot)org
Subject: pgsql: Invalidate smgr_targblock in smgrrelease().
Date: 2023-08-17 04:00:36
Message-ID: E1qWUBY-000WvU-0O@gemulon.postgresql.org
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Invalidate smgr_targblock in smgrrelease().

In rare circumstances involving relfilenode reuse, it might have been
possible for smgr_targblock to finish up pointing past the end.

Oversight in b74e94dc. Back-patch to 15.

Reviewed-by: Heikki Linnakangas <hlinnaka(at)iki(dot)fi>
Discussion: https://postgr.es/m/CA%2BhUKGJ8NTvqLHz6dqbQnt2c8XCki4r2QvXjBQcXpVwxTY_pvA%40mail.gmail.com

Branch
------
REL_15_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/d23e60e6673ab946b769d727c62fc65e146f17f3

Modified Files
--------------
src/backend/storage/smgr/smgr.c | 1 +
1 file changed, 1 insertion(+)

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