Remove NULL dereference from RenameRelationInternal().

nmisch · nmisch · commit b9ee1339bfbe · 2024-09-29T15:54:29.000-07:00
Defect in last week's commit aac2c9b, 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
@@ -3861,9 +3861,9 @@ 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)
