From ee446a4d19dd24463ea5f830ae9a26238923f6df Mon Sep 17 00:00:00 2001 From: =?utf8?q?Sebastian=20P=C3=B6hn?= Date: Mon, 20 Apr 2015 09:19:20 +0200 Subject: [PATCH] ip_forward: Drop frames with attached skb->sk commit 2ab957492d13bb819400ac29ae55911d50a82a13 upstream. Initial discussion was: [FYI] xfrm: Don't lookup sk_policy for timewait sockets Forwarded frames should not have a socket attached. Especially tw sockets will lead to panics later-on in the stack. This was observed with TPROXY assigning a tw socket and broken policy routing (misconfigured). As a result frame enters forwarding path instead of input. We cannot solve this in TPROXY as it cannot know that policy routing is broken. v2: Remove useless comment Signed-off-by: Sebastian Poehn Signed-off-by: David S. Miller Signed-off-by: Luis Henriques --- net/ipv4/ip_forward.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/ipv4/ip_forward.c b/net/ipv4/ip_forward.c index 787b3c294ce67..d5410b57da197 100644 --- a/net/ipv4/ip_forward.c +++ b/net/ipv4/ip_forward.c @@ -81,6 +81,9 @@ int ip_forward(struct sk_buff *skb) if (skb->pkt_type != PACKET_HOST) goto drop; + if (unlikely(skb->sk)) + goto drop; + if (skb_warn_if_lro(skb)) goto drop; -- 2.47.3