From f679b756d8f9af44654132d3fd4e3a3465afea89 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marcelina=20Ko=C5=9Bcielnicka?= <mwk@0x04.net>
Date: Sat, 23 Jul 2022 16:42:54 +0200
Subject: [PATCH] opt_reduce: Fix use-after-free.

Fixes #3418.
---
 passes/opt/opt_reduce.cc | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/passes/opt/opt_reduce.cc b/passes/opt/opt_reduce.cc
index 1a7c93fbd..c36a38dae 100644
--- a/passes/opt/opt_reduce.cc
+++ b/passes/opt/opt_reduce.cc
@@ -594,11 +594,9 @@ struct OptReduceWorker
 
 				if (cell->type.in(ID($mux), ID($pmux)))
 					opt_pmux(cell);
-
-				if (cell->type == ID($bmux))
+				else if (cell->type == ID($bmux))
 					opt_bmux(cell);
-
-				if (cell->type == ID($demux))
+				else if (cell->type == ID($demux))
 					opt_demux(cell);
 			}
 		}