ip_tunnel: Fix dst ref-count.

[~andy/linux] / net / ipv4 / gre_demux.c

diff --git a/net/ipv4/gre_demux.c b/net/ipv4/gre_demux.c
index 1863422fb7d553340151b1402ee30d4be1fcde29..250be7421ab36c50ce00a25dcd3c659ca1c97f18 100644 (file)
--- a/net/ipv4/gre_demux.c
+++ b/net/ipv4/gre_demux.c
@@ -182,6 +182,14 @@ static int gre_cisco_rcv(struct sk_buff *skb)
        int i;
        bool csum_err = false;
 
+#ifdef CONFIG_NET_IPGRE_BROADCAST
+       if (ipv4_is_multicast(ip_hdr(skb)->daddr)) {
+               /* Looped back packet, drop it! */
+               if (rt_is_output_route(skb_rtable(skb)))
+                       goto drop;
+       }
+#endif
+
        if (parse_gre_header(skb, &tpi, &csum_err) < 0)
                goto drop;