1 files changed, 17 insertions, 15 deletions

diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c
index a2ca53da4372..c5b1f71c3cd8 100644
--- a/net/ipv4/ipip.c
+++ b/net/ipv4/ipip.c
@@ -446,25 +446,27 @@ static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
                 goto tx_error;
         }
 
-        if (tiph->frag_off)
+        df |= old_iph->frag_off & htons(IP_DF);
+
+        if (df) {
                 mtu = dst_mtu(&rt->u.dst) - sizeof(struct iphdr);
-        else
-                mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu;
 
-        if (mtu < 68) {
-                stats->collisions++;
-                ip_rt_put(rt);
-                goto tx_error;
-        }
-        if (skb_dst(skb))
-                skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu);
+                if (mtu < 68) {
+                        stats->collisions++;
+                        ip_rt_put(rt);
+                        goto tx_error;
+                }
 
-        df |= (old_iph->frag_off&htons(IP_DF));
+                if (skb_dst(skb))
+                        skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu);
 
-        if ((old_iph->frag_off&htons(IP_DF)) && mtu < ntohs(old_iph->tot_len)) {
-                icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
-                ip_rt_put(rt);
-                goto tx_error;
+                if ((old_iph->frag_off & htons(IP_DF)) &&
+                    mtu < ntohs(old_iph->tot_len)) {
+                        icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
+                                  htonl(mtu));
+                        ip_rt_put(rt);
+                        goto tx_error;
+                }
         }
 
         if (tunnel->err_count > 0) {