commit 70f87de9fa0d454c5c176876fe5d5f6a7bb1fe9d
author Eric Dumazet <edumazet@google.com> Fri May 13 11:55:47 2022 -0700
committer David S. Miller <davem@davemloft.net> Mon May 16 10:31:06 2022 +0100
tree 7d4ae95381a2cb69ce28458bc3419ba4ac2303b9
parent d2c135619cb89d1d5693df81ab408c5e8e97e898

net_sched: em_meta: add READ_ONCE() in var_sk_bound_if()

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

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sched/em_meta.c

diff --git a/net/sched/em_meta.c b/net/sched/em_meta.c
index 0a04468..49bae3d 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();
 	}