From: Tom Lane <tgl@sss.pgh.pa.us>
To: pgsql-committers@lists.postgresql.org
Subject: pgsql: Avoid possible longjmp-induced logic error in PLy_trigger_build_
Date: Mon, 01 Apr 2024 19:15:21 +0000
Message-ID: <E1rrN7o-0001PQ-QQ@gemulon.postgresql.org> (raw)
Avoid possible longjmp-induced logic error in PLy_trigger_build_args.
The "pltargs" variable wasn't marked volatile, which makes it unsafe
to change its value within the PG_TRY block. It looks like the worst
outcome would be to fail to release a refcount on Py_None during an
(improbable) error exit, which would likely go unnoticed in the field.
Still, it's a bug. A one-liner fix could be to mark pltargs volatile,
but on the whole it seems cleaner to arrange things so that we don't
change its value within PG_TRY.
Per report from Xing Guo. This has been there for quite awhile,
so back-patch to all supported branches.
Discussion: https://postgr.es/m/CACpMh+DLrk=fDv07MNpBT4J413fDAm+gmMXgi8cjPONE+jvzuw@mail.gmail.com
Branch
------
REL_12_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/30fe8a7ba07efc84caba06bce536c0a273ef5655
Modified Files
--------------
src/pl/plpython/plpy_exec.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
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To: pgsql-committers@postgresql.org
Cc: tgl@sss.pgh.pa.us, pgsql-committers@lists.postgresql.org
Subject: Re: pgsql: Avoid possible longjmp-induced logic error in PLy_trigger_build_
In-Reply-To: <E1rrN7o-0001PQ-QQ@gemulon.postgresql.org>
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