PG Patch

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Hi

We have detected the following error in out PG logs:

SASTERROR: invalid memory alloc request size 4294967294.

I have searched for the error and was pointed to a patch on the
following link:

http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/vacu
umlazy.c.diff?r1=1.61.2.1&r2=1.61.2.2

Where can I find this patch and is there a specific way to apply the
patch?

Your help is appreciated.

Regards

Marc