linux-kernel - [PATCH] net: sched: qfq: dont intepret cls results when asked to drop

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Date:   Fri, 15 Sep 2023 18:50:36 +0800
From:   Ma Ke <make_ruc2021@....com>
To:     xiyou.wangcong@...il.com, jiri@...nulli.us, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ma Ke <make_ruc2021@....com>
Subject: [PATCH] net: sched: qfq: dont intepret cls results when asked to drop

If asked to drop a packet via TC_ACT_SHOT it is unsafe to
assume that res.class contains a valid pointer.

Signed-off-by: Ma Ke <make_ruc2021@....com>
---
 net/sched/sch_qfq.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/sched/sch_qfq.c b/net/sched/sch_qfq.c
index 546c10adcacd..20d52dc484b6 100644
--- a/net/sched/sch_qfq.c
+++ b/net/sched/sch_qfq.c
@@ -695,6 +695,8 @@ static struct qfq_class *qfq_classify(struct sk_buff *skb, struct Qdisc *sch,
 	*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
 	fl = rcu_dereference_bh(q->filter_list);
 	result = tcf_classify(skb, NULL, fl, &res, false);
+	if (result == TC_ACT_SHOT)
+		return NULL;
 	if (result >= 0) {
 #ifdef CONFIG_NET_CLS_ACT
 		switch (result) {
-- 
2.37.2