netdev - [PATCH -next 1/6] netfilter: nf_queue: Don't recompute the hook

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Message-ID: <87380vsj2l.fsf_-_@x220.int.ebiederm.org>
Date:	Fri, 10 Jul 2015 18:12:50 -0500
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Pablo Neira Ayuso <pablo@...filter.org>
Cc:	<netdev@...r.kernel.org>, <netfilter-devel@...r.kernel.org>,
	Stephen Hemminger <stephen@...workplumber.org>,
	Juanjo Ciarlante <jjciarla@...z.uncu.edu.ar>,
	Wensong Zhang <wensong@...ux-vs.org>,
	Simon Horman <horms@...ge.net.au>,
	Julian Anastasov <ja@....bg>,
	Patrick McHardy <kaber@...sh.net>,
	Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	Steffen Klassert <steffen.klassert@...unet.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	David Miller <davem@...emloft.net>
Subject: [PATCH -next 1/6] netfilter: nf_queue: Don't recompute the hook_list head


If someone sends packets from one of the netdevice ingress hooks to
the a userspace queue, and then userspace later accepts the packet,
the netfilter code can enter an infinite loop as the list head will
never be found.

Pass in the saved list_head to avoid this.

Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
---
 net/netfilter/nf_queue.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/netfilter/nf_queue.c b/net/netfilter/nf_queue.c
index cd60d397fe05..8a8b2abc35ff 100644
--- a/net/netfilter/nf_queue.c
+++ b/net/netfilter/nf_queue.c
@@ -213,7 +213,7 @@ void nf_reinject(struct nf_queue_entry *entry, unsigned int verdict)
 
 	if (verdict == NF_ACCEPT) {
 	next_hook:
-		verdict = nf_iterate(&nf_hooks[entry->state.pf][entry->state.hook],
+		verdict = nf_iterate(entry->state.hook_list,
 				     skb, &entry->state, &elem);
 	}
 
-- 
2.2.1

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