linux-kernel - [PATCH] bridge: provide a mtu() method for fake_dst

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Message-ID: <1324533632.2621.35.camel@edumazet-laptop>
Date:	Thu, 22 Dec 2011 07:00:32 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Chris Boot <bootc@...tc.net>, David Miller <davem@...emloft.net>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	Steffen Klassert <steffen.klassert@...unet.com>
Subject: [PATCH] bridge: provide a mtu() method for fake_dst_ops

Commit 618f9bc74a039da76 (net: Move mtu handling down to the protocol
depended handlers) forgot the bridge netfilter case, adding a NULL
dereference in ip_fragment().

Reported-by: Chris Boot <bootc@...tc.net>
CC: Steffen Klassert <steffen.klassert@...unet.com>
Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
---
 net/bridge/br_netfilter.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/net/bridge/br_netfilter.c b/net/bridge/br_netfilter.c
index d6ec372..08757dc 100644
--- a/net/bridge/br_netfilter.c
+++ b/net/bridge/br_netfilter.c
@@ -114,12 +114,18 @@ static struct neighbour *fake_neigh_lookup(const struct dst_entry *dst, const vo
 	return NULL;
 }
 
+static unsigned int fake_mtu(const struct dst_entry *dst)
+{
+	return dst->dev->mtu;
+}
+
 static struct dst_ops fake_dst_ops = {
 	.family =		AF_INET,
 	.protocol =		cpu_to_be16(ETH_P_IP),
 	.update_pmtu =		fake_update_pmtu,
 	.cow_metrics =		fake_cow_metrics,
 	.neigh_lookup =		fake_neigh_lookup,
+	.mtu =			fake_mtu,
 };
 
 /*


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