Bug#668511: Kernel panic with bridge networking
reassign 668511 src:linux-2.6 3.2.12-1
forwarded 668511 http://thread.gmane.org/gmane.linux.kernel/1283112
tags 668511 + upstream patch moreinfo
quit
Massimo Cetra wrote:
> [Subject: Bug#668511: Patch for this panic]
Please keep in mind that these appear as emails in a crowded inbox,
so the subject line can be a good place to put valuable context.
> the patch for this problem has been submitted to netdev and is here:
Thanks! Does the patch work against 3.2.y? See [1] for instructions.
Hope that helps,
Jonathan
[1] http://kernel-handbook.alioth.debian.org/ch-common-tasks.html#s-common-official
or the corresponding page in the debian-kernel-handbook package
From: "Peter Huang (Peng)" <peter.huangpeng@huawei.com>
Date: Tue, 17 Apr 2012 14:22:26 +0800
Subject: set fake_rtable's dst to NULL to avoid kernel Oops.
When bridge is deleted before tap/vif device's delete, kernel may encounter an oops because of NULL reference to fake_rtable's dst.
Set fake_rtable's dst to NULL before sending packets out can solve this problem.
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Peter Huang <peter.huangpeng@huawei.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
---
include/linux/netfilter_bridge.h | 8 ++++++++
net/bridge/br_forward.c | 1 +
net/bridge/br_netfilter.c | 6 +-----
3 files changed, 10 insertions(+), 5 deletions(-)
diff --git a/include/linux/netfilter_bridge.h b/include/linux/netfilter_bridge.h
index 0ddd161f3b06..70744fe5dcf0 100644
--- a/include/linux/netfilter_bridge.h
+++ b/include/linux/netfilter_bridge.h
@@ -104,9 +104,17 @@ struct bridge_skb_cb {
} daddr;
};
+static inline void br_drop_fake_rtable(struct sk_buff *skb) {
+ struct dst_entry *dst = skb_dst(skb);
+ /* abuse fact that only fake_rtable has DST_NOPEER set */
+ if (dst && (dst->flags & DST_NOPEER))
+ skb_dst_drop(skb);
+}
+
#else
#define nf_bridge_maybe_copy_header(skb) (0)
#define nf_bridge_pad(skb) (0)
+#define br_drop_fake_rtable(skb) (0)
#endif /* CONFIG_BRIDGE_NETFILTER */
#endif /* __KERNEL__ */
diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c
index ee64287f1290..e221f88ebb8d 100644
--- a/net/bridge/br_forward.c
+++ b/net/bridge/br_forward.c
@@ -47,6 +47,7 @@ int br_dev_queue_push_xmit(struct sk_buff *skb)
kfree_skb(skb);
} else {
skb_push(skb, ETH_HLEN);
+ br_drop_fake_rtable(skb);
dev_queue_xmit(skb);
}
diff --git a/net/bridge/br_netfilter.c b/net/bridge/br_netfilter.c
index fa8b8f763580..e7dd46de1347 100644
--- a/net/bridge/br_netfilter.c
+++ b/net/bridge/br_netfilter.c
@@ -687,11 +687,7 @@ static unsigned int br_nf_local_in(unsigned int hook, struct sk_buff *skb,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
- struct rtable *rt = skb_rtable(skb);
-
- if (rt && rt == bridge_parent_rtable(in))
- skb_dst_drop(skb);
-
+ br_drop_fake_rtable(skb);
return NF_ACCEPT;
}
--
1.7.10
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