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From 5eb3f07aa8bc9ba0b988a8d5f6a72318235074f7 Mon Sep 17 00:00:00 2001
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From: Jamal Hadi Salim <jhs@mojatatu.com>
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Date: Sun, 1 Jan 2023 16:57:43 -0500
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Subject: [PATCH 1/2] net: sched: atm: dont intepret cls results when asked to
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drop
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Git-commit: a2965c7be0522eaa18808684b7b82b248515511b
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Michal Koutný |
03cf48 |
References: bsc#1207036 CVE-2023-23454 bsc#1207125 CVE-2023-23455
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Patch-mainline: v6.2-rc3
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If asked to drop a packet via TC_ACT_SHOT it is unsafe to assume
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res.class contains a valid pointer
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Fixes: b0188d4dbe5f ("[NET_SCHED]: sch_atm: Lindent")
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Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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Signed-off-by: Denis Kirjanov <denis.kirjanov@suse.com>
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---
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net/sched/sch_atm.c | 5 ++++-
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1 file changed, 4 insertions(+), 1 deletion(-)
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diff --git a/net/sched/sch_atm.c b/net/sched/sch_atm.c
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index c5fd6366f309..9b255f13f2af 100644
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--- a/net/sched/sch_atm.c
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+++ b/net/sched/sch_atm.c
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@@ -386,10 +386,13 @@ static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
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result = tcf_classify(skb, fl, &res, true);
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if (result < 0)
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continue;
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+ if (result == TC_ACT_SHOT)
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+ goto done;
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+
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flow = (struct atm_flow_data *)res.class;
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if (!flow)
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flow = lookup_flow(sch, res.classid);
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- goto done;
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+ goto drop;
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}
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}
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flow = NULL;
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--
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2.16.4
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