diff options
| author | Sebastian Pöhn <sebastian.poehn@gmail.com> | 2015-04-20 09:19:20 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-05-06 21:56:20 +0200 |
| commit | fb138c4699c94b16bf9400394142c6d86fe70226 (patch) | |
| tree | 053c317286a318529c9020c76297f6732015efa1 | |
| parent | 89bf6007dd14768791598eca6fd387b9637226eb (diff) | |
ip_forward: Drop frames with attached skb->sk
[ Upstream commit 2ab957492d13bb819400ac29ae55911d50a82a13 ]
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 <sebastian.poehn@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | net/ipv4/ip_forward.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/net/ipv4/ip_forward.c b/net/ipv4/ip_forward.c index 31ee5c6033df..479e8a63125a 100644 --- a/net/ipv4/ip_forward.c +++ b/net/ipv4/ip_forward.c @@ -126,6 +126,9 @@ int ip_forward(struct sk_buff *skb) struct rtable *rt; /* Route we use */ struct ip_options *opt = &(IPCB(skb)->opt); + if (unlikely(skb->sk)) + goto drop; + if (skb_warn_if_lro(skb)) goto drop; |