1 files changed, 15 insertions, 16 deletions

diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index a1151b8adf3c..b1d282f11be7 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -223,31 +223,30 @@ static void ip_expire(unsigned long arg)
 
         if ((qp->q.last_in & INET_FRAG_FIRST_IN) && qp->q.fragments != NULL) {
                 struct sk_buff *head = qp->q.fragments;
+                const struct iphdr *iph;
+                int err;
 
                 rcu_read_lock();
                 head->dev = dev_get_by_index_rcu(net, qp->iif);
                 if (!head->dev)
                         goto out_rcu_unlock;
 
+                /* skb dst is stale, drop it, and perform route lookup again */
+                skb_dst_drop(head);
+                iph = ip_hdr(head);
+                err = ip_route_input_noref(head, iph->daddr, iph->saddr,
+                                           iph->tos, head->dev);
+                if (err)
+                        goto out_rcu_unlock;
+
                 /*
-                 * Only search router table for the head fragment,
-                 * when defraging timeout at PRE_ROUTING HOOK.
+                 * Only an end host needs to send an ICMP
+                 * "Fragment Reassembly Timeout" message, per RFC792.
                  */
-                if (qp->user == IP_DEFRAG_CONNTRACK_IN && !skb_dst(head)) {
-                        const struct iphdr *iph = ip_hdr(head);
-                        int err = ip_route_input(head, iph->daddr, iph->saddr,
-                                                 iph->tos, head->dev);
-                        if (unlikely(err))
-                                goto out_rcu_unlock;
-
-                        /*
-                         * Only an end host needs to send an ICMP
-                         * "Fragment Reassembly Timeout" message, per RFC792.
-                         */
-                        if (skb_rtable(head)->rt_type != RTN_LOCAL)
-                                goto out_rcu_unlock;
+                if (qp->user == IP_DEFRAG_CONNTRACK_IN &&
+                    skb_rtable(head)->rt_type != RTN_LOCAL)
+                        goto out_rcu_unlock;
 
-                }
 
                 /* Send an ICMP "Fragment Reassembly Timeout" message. */
                 icmp_send(head, ICMP_TIME_EXCEEDED, ICMP_EXC_FRAGTIME, 0);