1 files changed, 4 insertions, 2 deletions

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index fd9ecb52c66b..82cf2a722b23 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -934,12 +934,14 @@ static u32 __ip_rt_update_pmtu(struct rtable *rt, struct flowi4 *fl4, u32 mtu)
         if (mtu < ip_rt_min_pmtu)
                 mtu = ip_rt_min_pmtu;
 
+        rcu_read_lock();
         if (fib_lookup(dev_net(rt->dst.dev), fl4, &res) == 0) {
                 struct fib_nh *nh = &FIB_RES_NH(res);
 
                 update_or_create_fnhe(nh, fl4->daddr, 0, mtu,
                                       jiffies + ip_rt_mtu_expires);
         }
+        rcu_read_unlock();
         return mtu;
 }
 
@@ -956,7 +958,7 @@ static void ip_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
                 dst->obsolete = DST_OBSOLETE_KILL;
         } else {
                 rt->rt_pmtu = mtu;
-                dst_set_expires(&rt->dst, ip_rt_mtu_expires);
+                rt->dst.expires = max(1UL, jiffies + ip_rt_mtu_expires);
         }
 }
 
@@ -1263,7 +1265,7 @@ static void ipv4_dst_destroy(struct dst_entry *dst)
 {
         struct rtable *rt = (struct rtable *) dst;
 
-        if (dst->flags & DST_NOCACHE) {
+        if (!list_empty(&rt->rt_uncached)) {
                 spin_lock_bh(&rt_uncached_lock);
                 list_del(&rt->rt_uncached);
                 spin_unlock_bh(&rt_uncached_lock);