From: Heikki Linnakangas <heikki.linnakangas@iki.fi>
To: pgsql-committers@lists.postgresql.org
Subject: pgsql: Avoid 0-length memcpy to NULL with EXEC_BACKEND
Date: Wed, 03 Jul 2024 13:22:47 +0000
Message-ID: <E1sOzwc-0009yv-CT@gemulon.postgresql.org> (raw)
Avoid 0-length memcpy to NULL with EXEC_BACKEND
memcpy(NULL, src, 0) is forbidden by POSIX, even though every
production version of libc allows it. Let's be tidy.
Per report from Thomas Munro, running UBSan with EXEC_BACKEND.
Backpatch to v17, where this code was added.
Discussion: https://www.postgresql.org/message-id/CA%2BhUKG%2Be-dV7YWBzfBZXsgovgRuX5VmvmOT%2Bv0aXiZJ-EKbXcw@mail...
Branch
------
master
Details
-------
https://git.postgresql.org/pg/commitdiff/f3412a61f3f92d795ce0c8bb715831ec02124bfb
Modified Files
--------------
src/backend/postmaster/launch_backend.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
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To: pgsql-committers@postgresql.org
Cc: heikki.linnakangas@iki.fi, pgsql-committers@lists.postgresql.org
Subject: Re: pgsql: Avoid 0-length memcpy to NULL with EXEC_BACKEND
In-Reply-To: <E1sOzwc-0009yv-CT@gemulon.postgresql.org>
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