1 files changed, 3 insertions, 0 deletions

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 90ba8358a892..741df67a81ec 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -909,6 +909,9 @@ static void __ip_rt_update_pmtu(struct rtable *rt, struct flowi4 *fl4, u32 mtu)
         struct dst_entry *dst = &rt->dst;
         struct fib_result res;
 
+        if (dst->dev->mtu < mtu)
+                return;
+
         if (mtu < ip_rt_min_pmtu)
                 mtu = ip_rt_min_pmtu;