linux-kernel - [PATCH 4.9 17/25] cls_matchall: fix tcf_unbind

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Date:   Tue, 21 Aug 2018 08:21:31 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Li Shuang <shuali@...hat.com>,
        Hangbin Liu <liuhangbin@...il.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.9 17/25] cls_matchall: fix tcf_unbind_filter missing

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Hangbin Liu <liuhangbin@...il.com>

[ 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@...hat.com>
Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
Acked-by: Cong Wang <xiyou.wangcong@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/sched/cls_matchall.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/net/sched/cls_matchall.c
+++ b/net/sched/cls_matchall.c
@@ -94,6 +94,8 @@ static bool mall_destroy(struct tcf_prot
 	if (!head)
 		return true;
 
+	tcf_unbind_filter(tp, &head->res);
+
 	if (tc_should_offload(dev, tp, head->flags))
 		mall_destroy_hw_filter(tp, head, (unsigned long) head);