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

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Message-Id: <20230915134408.3410595-1-make_ruc2021@163.com>
Date:   Fri, 15 Sep 2023 21:44:08 +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 that res.class contains a valid pointer.

Signed-off-by: Ma Ke <make_ruc2021@....com>
---
 net/sched/sch_hfsc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/sched/sch_hfsc.c b/net/sched/sch_hfsc.c
index 3554085bc2be..8e07a215f7d1 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:
@@ -1142,8 +1144,6 @@ hfsc_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr)
 		case TC_ACT_TRAP:
 			*qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
 			fallthrough;
-		case TC_ACT_SHOT:
-			return NULL;
 		}
 #endif
 		cl = (struct hfsc_class *)res.class;
-- 
2.37.2