truct net *net, struct mr_table *mrt,
 		return -1;
 	}
 
-	encap += LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len;
+	encap += LL_RESERVED_SPACE(dst_dev_rcu(&rt->dst)) + rt->dst.header_len;
 
 	if (skb_cow(skb, encap)) {
 		ip_rt_put(rt);
@@ -1957,7 +1957,7 @@ static void ipmr_queue_fwd_xmit(struct net *net, struct mr_table *mrt,
 	 * result in receiving multiple packets.
 	 */
 	NF_HOOK(NFPROTO_IPV4, NF_INET_FORWARD,
-		net, NULL, skb, skb->dev, rt->dst.dev,
+		net, NULL, skb, skb->dev, dst_dev_rcu(&rt->dst),
 		ipmr_forward_finish);
 	return;
 
@@ -2301,7 +2301,7 @@ int ip_mr_output(struct net *net, struct sock *sk, struct sk_buff *skb)
 
 	guard(rcu)();
 
-	dev = rt->dst.dev;
+	dev = dst_dev_rcu(&rt->dst);
 
 	if (IPCB(skb)->flags & IPSKB_FORWARDED)
 		goto mc_output;
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 97b96275a775d..5582ccd673eeb 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -413,11 +413,11 @@ static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst,
 					   const void *daddr)
 {
 	const struct rtable *rt = container_of(dst, struct rtable, dst);
-	struct net_device *dev = dst_dev(dst);
+	struct net_device *dev;
 	struct neighbour *n;
 
 	rcu_read_lock();
-
+	dev = dst_dev_rcu(dst);
 	if (likely(rt->rt_gw_family == AF_INET)) {
 		n = ip_neigh_gw4(dev, rt->rt_gw4);
 	} else if (rt->rt_gw_family == AF_INET6) {
-- 
2.51.0[PATCH 6.17 291/563] ipv4: start using dst_dev_rcu()Greg Kroah-Hartman <gregkh@linuxfoundation.org> undefinedstable@vger.kernel.org undefined undefined undefined undefined undefined undefinedŽsƒ˜