netdev - [PATCH net 1/2] net: sched: atm: dont intepret cls results when asked to drop

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Date:   Sun,  1 Jan 2023 16:57:43 -0500
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     davem@...emloft.net, kuba@...nel.org, edumazet@...gle.com,
        pabeni@...hat.com
Cc:     xiyou.wangcong@...il.com, jiri@...nulli.us, netdev@...r.kernel.org,
        zengyhkyle@...il.com, Jamal Hadi Salim <jhs@...atatu.com>
Subject: [PATCH net 1/2] net: sched: atm: 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
Fixes: b0188d4dbe5f ("[NET_SCHED]: sch_atm: Lindent")

Signed-off-by: Jamal Hadi Salim <jhs@...atatu.com>
---
 net/sched/sch_atm.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/sched/sch_atm.c b/net/sched/sch_atm.c
index f52255fea652..4a981ca90b0b 100644
--- a/net/sched/sch_atm.c
+++ b/net/sched/sch_atm.c
@@ -393,10 +393,13 @@ static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
 				result = tcf_classify(skb, NULL, fl, &res, true);
 				if (result < 0)
 					continue;
+				if (result == TC_ACT_SHOT)
+					goto done;
+
 				flow = (struct atm_flow_data *)res.class;
 				if (!flow)
 					flow = lookup_flow(sch, res.classid);
-				goto done;
+				goto drop;
 			}
 		}
 		flow = NULL;
-- 
2.34.1