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authorHerbert Xu <herbert@gondor.apana.org.au>2010-07-19 19:26:45 +0000
committerDavid S. Miller <davem@davemloft.net>2010-07-19 23:28:25 -0700
commit573201f36fd9c7c6d5218cdcd9948cee700b277d (patch)
tree3fdd5cd05e26fdfe38d5d1a72b4d4aa41ecd181f /net
parent45e77d314585869dfe43c82679f7e08c9b35b898 (diff)
downloadlinux-2.6.34-ux500-573201f36fd9c7c6d5218cdcd9948cee700b277d.tar.gz
bridge: Partially disable netpoll support
The new netpoll code in bridging contains use-after-free bugs that are non-trivial to fix. This patch fixes this by removing the code that uses skbs after they're freed. As a consequence, this means that we can no longer call bridge from the netpoll path, so this patch also removes the controller function in order to disable netpoll. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Thanks, Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/bridge/br_device.c9
-rw-r--r--net/bridge/br_forward.c23
2 files changed, 1 insertions, 31 deletions
diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
index eedf2c94820..753fc4221f3 100644
--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c
@@ -217,14 +217,6 @@ static bool br_devices_support_netpoll(struct net_bridge *br)
return count != 0 && ret;
}
-static void br_poll_controller(struct net_device *br_dev)
-{
- struct netpoll *np = br_dev->npinfo->netpoll;
-
- if (np->real_dev != br_dev)
- netpoll_poll_dev(np->real_dev);
-}
-
void br_netpoll_cleanup(struct net_device *dev)
{
struct net_bridge *br = netdev_priv(dev);
@@ -295,7 +287,6 @@ static const struct net_device_ops br_netdev_ops = {
.ndo_do_ioctl = br_dev_ioctl,
#ifdef CONFIG_NET_POLL_CONTROLLER
.ndo_netpoll_cleanup = br_netpoll_cleanup,
- .ndo_poll_controller = br_poll_controller,
#endif
};
diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c
index a4e72a89e4f..595da45f908 100644
--- a/net/bridge/br_forward.c
+++ b/net/bridge/br_forward.c
@@ -50,14 +50,7 @@ int br_dev_queue_push_xmit(struct sk_buff *skb)
kfree_skb(skb);
else {
skb_push(skb, ETH_HLEN);
-
-#ifdef CONFIG_NET_POLL_CONTROLLER
- if (unlikely(skb->dev->priv_flags & IFF_IN_NETPOLL)) {
- netpoll_send_skb(skb->dev->npinfo->netpoll, skb);
- skb->dev->priv_flags &= ~IFF_IN_NETPOLL;
- } else
-#endif
- dev_queue_xmit(skb);
+ dev_queue_xmit(skb);
}
}
@@ -73,23 +66,9 @@ int br_forward_finish(struct sk_buff *skb)
static void __br_deliver(const struct net_bridge_port *to, struct sk_buff *skb)
{
-#ifdef CONFIG_NET_POLL_CONTROLLER
- struct net_bridge *br = to->br;
- if (unlikely(br->dev->priv_flags & IFF_IN_NETPOLL)) {
- struct netpoll *np;
- to->dev->npinfo = skb->dev->npinfo;
- np = skb->dev->npinfo->netpoll;
- np->real_dev = np->dev = to->dev;
- to->dev->priv_flags |= IFF_IN_NETPOLL;
- }
-#endif
skb->dev = to->dev;
NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
br_forward_finish);
-#ifdef CONFIG_NET_POLL_CONTROLLER
- if (skb->dev->npinfo)
- skb->dev->npinfo->netpoll->dev = br->dev;
-#endif
}
static void __br_forward(const struct net_bridge_port *to, struct sk_buff *skb)