Remove NULL dereference from RenameRelationInternal().

Defect in last week's commit aac2c9b4fde889d13f859c233c2523345e72d32b,
per Coverity.  Reaching this would need catalog corruption.  Back-patch
to v12, like that commit.

diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index f3050d8a1d241c1841054e7e88065c50a1c5038f..e6c911fd9a44f21f3feaa1718541ef363021a770 100644 (file)
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -3893,9 +3893,9 @@ RenameRelationInternal(Oid myrelid, const char *newrelname, bool is_internal, bo
    relrelation = table_open(RelationRelationId, RowExclusiveLock);
 
    reltup = SearchSysCacheLockedCopy1(RELOID, ObjectIdGetDatum(myrelid));
-   otid = reltup->t_self;
    if (!HeapTupleIsValid(reltup))  /* shouldn't happen */
        elog(ERROR, "cache lookup failed for relation %u", myrelid);
+   otid = reltup->t_self;
    relform = (Form_pg_class) GETSTRUCT(reltup);
 
    if (get_relname_relid(newrelname, namespaceId) != InvalidOid)