1 files changed, 2 insertions, 0 deletions

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 24fd4c596643..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;
 }