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net: sched: atm: dont intepret cls results when asked to drop

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[ Upstream commit a2965c7be0 ]

If asked to drop a packet via TC_ACT_SHOT it is unsafe to assume
res.class contains a valid pointer
Fixes: b0188d4dbe ("[NET_SCHED]: sch_atm: Lindent")

Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jamal Hadi Salim 2023-01-01 16:57:43 -05:00 committed by Greg Kroah-Hartman
parent 95da1882ce
commit f02327a487
1 changed files with 4 additions and 1 deletions
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5
net/sched/sch_atm.c
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@ -397,10 +397,13 @@ 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;