From 178742867e4f5f2edefeff69cfeb9b6a24ea9ece Mon Sep 17 00:00:00 2001
From: Hangbin Liu <liuhangbin@gmail.com>
Date: Tue, 14 Aug 2018 17:28:26 +0800
Subject: [PATCH] cls_matchall: fix tcf_unbind_filter missing

[ Upstream commit a51c76b4dfb30496dc65396a957ef0f06af7fb22 ]

Fix tcf_unbind_filter missing in cls_matchall as this will trigger
WARN_ON() in cbq_destroy_class().

Fixes: fd62d9f5c575f ("net/sched: matchall: Fix configuration race")
Reported-by: Li Shuang <shuali@redhat.com>
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Acked-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/sched/cls_matchall.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/sched/cls_matchall.c b/net/sched/cls_matchall.c
index 3684153cd8a9..6499aecfbfc4 100644
--- a/net/sched/cls_matchall.c
+++ b/net/sched/cls_matchall.c
@@ -112,6 +112,8 @@ static void mall_destroy(struct tcf_proto *tp)
 	if (!head)
 		return;
 
+	tcf_unbind_filter(tp, &head->res);
+
 	if (tc_should_offload(dev, head->flags))
 		mall_destroy_hw_filter(tp, head, (unsigned long) head);