netdev - [PATCH] net: sched: hfsc: dont intepret cls results when asked to drop

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Message-Id: <20230915121841.3408778-1-make_ruc2021@163.com>
Date: Fri, 15 Sep 2023 20:18:41 +0800
From: Ma Ke <make_ruc2021@....com>
To: jhs@...atatu.com,
	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: hfsc: dont intepret cls results when asked to drop

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

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

diff --git a/net/sched/sch_hfsc.c b/net/sched/sch_hfsc.c
index 3554085bc2be..2a76027b14e6 100644
--- a/net/sched/sch_hfsc.c
+++ b/net/sched/sch_hfsc.c
@@ -1135,6 +1135,8 @@ hfsc_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr)
 	head = &q->root;
 	tcf = rcu_dereference_bh(q->root.filter_list);
 	while (tcf && (result = tcf_classify(skb, NULL, tcf, &res, false)) >= 0) {
+		if (result == TC_ACT_SHOT)
+			return NULL;
 #ifdef CONFIG_NET_CLS_ACT
 		switch (result) {
 		case TC_ACT_QUEUED:
-- 
2.37.2