S);
 
diff --git a/net/ipv6/output_core.c b/net/ipv6/output_core.c
index d21fe27fe21e3..1c9b283a4132d 100644
--- a/net/ipv6/output_core.c
+++ b/net/ipv6/output_core.c
@@ -104,18 +104,20 @@ EXPORT_SYMBOL(ip6_find_1stfragopt);
 int ip6_dst_hoplimit(struct dst_entry *dst)
 {
 	int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
+
+	rcu_read_lock();
 	if (hoplimit == 0) {
-		struct net_device *dev = dst_dev(dst);
+		struct net_device *dev = dst_dev_rcu(dst);
 		struct inet6_dev *idev;
 
-		rcu_read_lock();
 		idev = __in6_dev_get(dev);
 		if (idev)
 			hoplimit = READ_ONCE(idev->cnf.hop_limit);
 		else
 			hoplimit = READ_ONCE(dev_net(dev)->ipv6.devconf_all->hop_limit);
-		rcu_read_unlock();
 	}
+	rcu_read_unlock();
+
 	return hoplimit;
 }
 EXPORT_SYMBOL(ip6_dst_hoplimit);
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 3299cfa12e21c..3371f16b7a3e6 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -2943,7 +2943,7 @@ static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
 
 		if (res.f6i->nh) {
 			struct fib6_nh_match_arg arg = {
-				.dev = dst_dev(dst),
+				.dev = dst_dev_rcu(dst),
 				.gw = &rt6->rt6i_gateway,
 			};
 
@@ -3238,7 +3238,6 @@ EXPORT_SYMBOL_GPL(ip6_sk_redirect);
 
 static unsigned int ip6_default_advmss(const struct dst_entry *dst)
 {
-	struct net_device *dev = dst_dev(dst);
 	unsigned int mtu = dst_mtu(dst);
 	struct net *net;
 
@@ -3246,7 +3245,7 @@ static unsigned int ip6_default_advmss(const struct dst_entry *dst)
 
 	rcu_read_lock();
 
-	net = dev_net_rcu(dev);
+	net = dst_dev_net_rcu(dst);
 	if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
 		mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
 
@@ -4301,7 +4300,7 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu
 
 	if (res.f6i->nh) {
 		struct fib6_nh_match_arg arg = {
-			.dev = dst_dev(dst),
+			.dev = dst_dev_rcu(dst),
 			.gw = &rt->rt6i_gateway,
 		};
 
-- 
2.51.0[PATCH 6.17 286/563] ipv6: start using dst_dev_rcu()Greg Kroah-Hartman <gregkh@linuxfoundation.org> undefinedstable@vger.kernel.org undefined undefined undefined undefined undefined undefined