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net: l3mdev: use skb_dst_dev_rcu() in l3mdev_l3_out()

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Extend the RCU section a bit so that we can use the safer
skb_dst_dev_rcu() helper.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20260130191906.3781856-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2026-01-30 19:19:06 +00:00 • committed by Jakub Kicinski
parent 61cef6454c
commit 82f35bec11
1 changed files with 4 additions and 3 deletions
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7
include/net/l3mdev.h
View file

@ -207,18 +207,19 @@ struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb)
static inline
struct sk_buff *l3mdev_l3_out(struct sock *sk, struct sk_buff *skb, u16 proto)
{
struct net_device *dev = skb_dst(skb)->dev;
struct net_device *dev;
rcu_read_lock();
dev = skb_dst_dev_rcu(skb);
if (netif_is_l3_slave(dev)) {
struct net_device *master;
rcu_read_lock();
master = netdev_master_upper_dev_get_rcu(dev);
if (master && master->l3mdev_ops->l3mdev_l3_out)
skb = master->l3mdev_ops->l3mdev_l3_out(master, sk,
skb, proto);
rcu_read_unlock();
}
rcu_read_unlock();
return skb;
}