diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 836eecd..cb81464 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -396,9 +396,9 @@ static int ipip6_rcv(struct sk_buff *skb)
 	}
 
 	icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
-	kfree_skb(skb);
 	read_unlock(&ipip6_lock);
 out:
+	kfree_skb(skb);
 	return 0;
 }