From: Pravin B Shelar <pshelar@xxxxxxxxxx> 3.12-stable review patch. If anyone has any objections, please let me know. =============== [ Upstream commit fbd02dd405d0724a0f25897ed4a6813297c9b96f ] Commit 10ddceb22ba (ip_tunnel:multicast process cause panic due to skb->_skb_refdst NULL pointer) removed dst-drop call from ip-tunnel-recv. Following commit reintroduce dst-drop and fix the original bug by checking loopback packet before releasing dst. Original bug: https://bugzilla.kernel.org/show_bug.cgi?id=70681 CC: Xin Long <lucien.xin@xxxxxxxxx> Signed-off-by: Pravin B Shelar <pshelar@xxxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Jiri Slaby <jslaby@xxxxxxx> --- net/ipv4/gre_demux.c | 8 ++++++++ net/ipv4/ip_tunnel.c | 3 --- net/ipv4/ip_tunnel_core.c | 1 + 3 files changed, 9 insertions(+), 3 deletions(-) diff --git a/net/ipv4/gre_demux.c b/net/ipv4/gre_demux.c index 736c9fc3ef93..0c0c1f09fd17 100644 --- a/net/ipv4/gre_demux.c +++ b/net/ipv4/gre_demux.c @@ -211,6 +211,14 @@ 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; diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c index 995a0bb33a65..3bedb26cfb53 100644 --- a/net/ipv4/ip_tunnel.c +++ b/net/ipv4/ip_tunnel.c @@ -411,9 +411,6 @@ int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, #ifdef CONFIG_NET_IPGRE_BROADCAST if (ipv4_is_multicast(iph->daddr)) { - /* Looped back packet, drop it! */ - if (rt_is_output_route(skb_rtable(skb))) - goto drop; tunnel->dev->stats.multicast++; skb->pkt_type = PACKET_BROADCAST; } diff --git a/net/ipv4/ip_tunnel_core.c b/net/ipv4/ip_tunnel_core.c index ba22cc3a5a53..c31e3ad98ef2 100644 --- a/net/ipv4/ip_tunnel_core.c +++ b/net/ipv4/ip_tunnel_core.c @@ -109,6 +109,7 @@ int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto) secpath_reset(skb); if (!skb->l4_rxhash) skb->rxhash = 0; + skb_dst_drop(skb); skb->vlan_tci = 0; skb_set_queue_mapping(skb, 0); skb->pkt_type = PACKET_HOST; -- 1.9.2 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html