netdev - [PATCH v2 net-next 07/10] net_sched: em_meta: add READ_ONCE() in var_sk_bound

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Date:   Fri, 13 May 2022 11:55:47 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH v2 net-next 07/10] net_sched: em_meta: add READ_ONCE() in var_sk_bound_if()

From: Eric Dumazet <edumazet@...gle.com>

sk->sk_bound_dev_if can change under us, use READ_ONCE() annotation.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 net/sched/em_meta.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/net/sched/em_meta.c b/net/sched/em_meta.c
index 0a04468b73145546097788db0645ef9e5b459bca..49bae3d5006b0f83330b4cbe30344c0741743575 100644
--- a/net/sched/em_meta.c
+++ b/net/sched/em_meta.c
@@ -311,12 +311,15 @@ META_COLLECTOR(int_sk_bound_if)
 
 META_COLLECTOR(var_sk_bound_if)
 {
+	int bound_dev_if;
+
 	if (skip_nonlocal(skb)) {
 		*err = -1;
 		return;
 	}
 
-	if (skb->sk->sk_bound_dev_if == 0) {
+	bound_dev_if = READ_ONCE(skb->sk->sk_bound_dev_if);
+	if (bound_dev_if == 0) {
 		dst->value = (unsigned long) "any";
 		dst->len = 3;
 	} else {
@@ -324,7 +327,7 @@ META_COLLECTOR(var_sk_bound_if)
 
 		rcu_read_lock();
 		dev = dev_get_by_index_rcu(sock_net(skb->sk),
-					   skb->sk->sk_bound_dev_if);
+					   bound_dev_if);
 		*err = var_dev(dev, dst);
 		rcu_read_unlock();
 	}
-- 
2.36.0.550.gb090851708-goog