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);