netdev - [PATCH net 1/6] net/sched: sch_ingress: Only create under TC_H

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Message-Id: <d24b49826204dbdd1aa1a209e79bbfe384a96b67.1683326865.git.peilin.ye@bytedance.com>
Date: Fri,  5 May 2023 17:12:22 -0700
From: Peilin Ye <yepeilin.cs@...il.com>
To: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	Cong Wang <xiyou.wangcong@...il.com>,
	Jiri Pirko <jiri@...nulli.us>
Cc: Peilin Ye <peilin.ye@...edance.com>,
	Daniel Borkmann <daniel@...earbox.net>,
	John Fastabend <john.r.fastabend@...el.com>,
	Vlad Buslov <vladbu@...lanox.com>,
	Pedro Tammela <pctammela@...atatu.com>,
	Hillf Danton <hdanton@...a.com>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Cong Wang <cong.wang@...edance.com>,
	Peilin Ye <yepeilin.cs@...il.com>
Subject: [PATCH net 1/6] net/sched: sch_ingress: Only create under TC_H_INGRESS

ingress Qdiscs are only supposed to be created under TC_H_INGRESS.
Similar to mq_init(), return -EOPNOTSUPP if 'parent' is not
TC_H_INGRESS.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Reported-by: syzbot+b53a9c0d1ea4ad62da8b@...kaller.appspotmail.com
Link: https://lore.kernel.org/netdev/0000000000006cf87705f79acf1a@google.com
Signed-off-by: Peilin Ye <peilin.ye@...edance.com>
---
 net/sched/sch_ingress.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/sched/sch_ingress.c b/net/sched/sch_ingress.c
index 84838128b9c5..3d71f7a3b4ad 100644
--- a/net/sched/sch_ingress.c
+++ b/net/sched/sch_ingress.c
@@ -80,6 +80,9 @@ static int ingress_init(struct Qdisc *sch, struct nlattr *opt,
 	struct net_device *dev = qdisc_dev(sch);
 	int err;
 
+	if (sch->parent != TC_H_INGRESS)
+		return -EOPNOTSUPP;
+
 	net_inc_ingress_queue();
 
 	mini_qdisc_pair_init(&q->miniqp, sch, &dev->miniq_ingress);
-- 
2.20.1