From: Pablo Neira Ayuso <pablo@netfilter.org>
To: netfilter-devel@vger.kernel.org
Cc: davem@davemloft.net, netdev@vger.kernel.org
Subject: [PATCH 2/2] netfilter: bridge: fix NULL deref in physin/out ifindex helpers
Date: Mon, 27 Apr 2015 20:41:57 +0200 [thread overview]
Message-ID: <1430160117-21150-3-git-send-email-pablo@netfilter.org> (raw)
In-Reply-To: <1430160117-21150-1-git-send-email-pablo@netfilter.org>
From: Florian Westphal <fw@strlen.de>
Might not have an outdev yet. We'll oops when iface goes down while skbs
are still nfqueue'd:
RIP: 0010:[<ffffffff81422a2f>] [<ffffffff81422a2f>] dev_cmp+0x4f/0x80
nfqnl_rcv_dev_event+0xe2/0x150
notifier_call_chain+0x53/0xa0
Fixes: c737b7c4510026 ("netfilter: bridge: add helpers for fetching physin/outdev")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
include/linux/netfilter_bridge.h | 16 ++++++++++++++--
1 file changed, 14 insertions(+), 2 deletions(-)
diff --git a/include/linux/netfilter_bridge.h b/include/linux/netfilter_bridge.h
index ab8f76d..f2fdb5a 100644
--- a/include/linux/netfilter_bridge.h
+++ b/include/linux/netfilter_bridge.h
@@ -39,12 +39,24 @@ static inline void br_drop_fake_rtable(struct sk_buff *skb)
static inline int nf_bridge_get_physinif(const struct sk_buff *skb)
{
- return skb->nf_bridge ? skb->nf_bridge->physindev->ifindex : 0;
+ struct nf_bridge_info *nf_bridge;
+
+ if (skb->nf_bridge == NULL)
+ return 0;
+
+ nf_bridge = skb->nf_bridge;
+ return nf_bridge->physindev ? nf_bridge->physindev->ifindex : 0;
}
static inline int nf_bridge_get_physoutif(const struct sk_buff *skb)
{
- return skb->nf_bridge ? skb->nf_bridge->physoutdev->ifindex : 0;
+ struct nf_bridge_info *nf_bridge;
+
+ if (skb->nf_bridge == NULL)
+ return 0;
+
+ nf_bridge = skb->nf_bridge;
+ return nf_bridge->physoutdev ? nf_bridge->physoutdev->ifindex : 0;
}
static inline struct net_device *
--
1.7.10.4
next prev parent reply other threads:[~2015-04-27 18:37 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-27 18:41 [PATCH 0/2] Netfilter fixes for net Pablo Neira Ayuso
2015-04-27 18:41 ` [PATCH 1/2] netfilter: nf_tables: fix wrong length for jump/goto verdicts Pablo Neira Ayuso
2015-04-27 18:41 ` Pablo Neira Ayuso [this message]
2015-04-28 3:13 ` [PATCH 0/2] Netfilter fixes for net David Miller
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