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Message-Id: <20220408094745.3129754-2-b.spranger@linutronix.de>
Date: Fri, 8 Apr 2022 11:47:45 +0200
From: Benedikt Spranger <b.spranger@...utronix.de>
To: netdev@...r.kernel.org
Cc: Kurt Kanzenbach <kurt@...utronix.de>,
Vinicius Costa Gomes <vinicius.gomes@...el.com>,
Jamal Hadi Salim <jhs@...atatu.com>,
Cong Wang <xiyou.wangcong@...il.com>,
Jiri Pirko <jiri@...nulli.us>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Vedang Patel <vedang.patel@...el.com>
Subject: [PATCH v2 1/1] net/sched: taprio: Check if socket flags are valid
A user may set the SO_TXTIME socket option to ensure a packet is send
at a given time. The taprio scheduler has to confirm, that it is allowed
to send a packet at that given time, by a check against the packet time
schedule. The scheduler drop the packet, if the gates are closed at the
given send time.
The check, if SO_TXTIME is set, may fail since sk_flags are part of an
union and the union is used otherwise. This happen, if a socket is not
a full socket, like a request socket for example.
Add a check to verify, if the union is used for sk_flags.
Fixes: 4cfd5779bd6e ("taprio: Add support for txtime-assist mode")
Signed-off-by: Benedikt Spranger <b.spranger@...utronix.de>
Reviewed-by: Kurt Kanzenbach <kurt@...utronix.de>
Acked-by: Vinicius Costa Gomes <vinicius.gomes@...el.com>
---
net/sched/sch_taprio.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/net/sched/sch_taprio.c b/net/sched/sch_taprio.c
index 1ce6416b4810..a871b3ef4bca 100644
--- a/net/sched/sch_taprio.c
+++ b/net/sched/sch_taprio.c
@@ -419,7 +419,8 @@ static int taprio_enqueue_one(struct sk_buff *skb, struct Qdisc *sch,
{
struct taprio_sched *q = qdisc_priv(sch);
- if (skb->sk && sock_flag(skb->sk, SOCK_TXTIME)) {
+ /* sk_flags are only safe to use on full sockets. */
+ if (skb->sk && sk_fullsock(skb->sk) && sock_flag(skb->sk, SOCK_TXTIME)) {
if (!is_valid_interval(skb, sch))
return qdisc_drop(skb, sch, to_free);
} else if (TXTIME_ASSIST_IS_ENABLED(q->flags)) {
--
2.20.1
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