pgsql: Fix portalmem.c to avoid keeping a dangling pointer to a cached

Log Message:
-----------
Fix portalmem.c to avoid keeping a dangling pointer to a cached plan list
after it's released its reference count for the cached plan. There are
code paths that might try to examine the plan list before noticing that
the portal is already in aborted state. Report and diagnosis by Tatsuo
Ishii, though this isn't exactly his proposed patch.

Modified Files:
--------------
pgsql/src/backend/utils/mmgr:
portalmem.c (r1.115 -> r1.116)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mmgr/portalmem.c?r1=1.115&r2=1.116)

Thanks. I confirmed the problem goes away. BTW, are we going to back
patch to 8.2 or before?
--
Tatsuo Ishii
SRA OSS, Inc. Japan

Tatsuo Ishii <ishii@postgresql.org> writes:

Thanks. I confirmed the problem goes away. BTW, are we going to back
patch to 8.2 or before?

That code isn't there before 8.3.

regards, tom lane