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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>
This commit is contained in:
Herbert Xu 2010-07-19 19:26:45 +00:00 committed by David S. Miller
parent 45e77d3145
commit 573201f36f
2 changed files with 1 additions and 31 deletions
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9
net/bridge/br_device.c
View File

@ -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
};

23
net/bridge/br_forward.c
View File

@ -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)