In collect_md mode, if the tun dev is down, it still can call
ip_tunnel_rcv to receive on packets, and the rx statistics increase
improperly.
Fixes: 2e15ea390e6f ("ip_gre: Add support to collect tunnel metadata.")
Cc: Pravin B Shelar <pshe...@nicira.com>
Signed-off-by: Haishuang Yan <yanhaishu...@cmss.chinamobile.com>
---
net/ipv4/ip_tunnel.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c
index 0f1d876..a3caba1 100644
--- a/net/ipv4/ip_tunnel.c
+++ b/net/ipv4/ip_tunnel.c
@@ -176,7 +176,7 @@ struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net
*itn,
return cand;
t = rcu_dereference(itn->collect_md_tun);
- if (t)
+ if (t && (t->dev->flags & IFF_UP))
return t;
if (itn->fb_tunnel_dev && itn->fb_tunnel_dev->flags & IFF_UP)
--
1.8.3.1
