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ipvs: fix oops in ip_vs_dst_event on rmmod 

After commit 39f618b4fd (3.4)
"ipvs: reset ipvs pointer in netns" we can oops in
ip_vs_dst_event on rmmod ip_vs because ip_vs_control_cleanup
is called after the ipvs_core_ops subsys is unregistered and
net->ipvs is NULL. Fix it by exiting early from ip_vs_dst_event
if ipvs is NULL. It is safe because all services and dests
for the net are already freed.

Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Julian Anastasov 2012-07-07 20:30:11 +03:00 committed by Pablo Neira Ayuso
parent 9e33ce453f
commit 283283c4da
1 changed files with 3 additions and 2 deletions
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5
net/netfilter/ipvs/ip_vs_ctl.c
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@ -1521,11 +1521,12 @@ static int ip_vs_dst_event(struct notifier_block *this, unsigned long event,
{
struct net_device *dev = ptr;
struct net *net = dev_net(dev);
struct netns_ipvs *ipvs = net_ipvs(net);
struct ip_vs_service *svc;
struct ip_vs_dest *dest;
unsigned int idx;
if (event != NETDEV_UNREGISTER)
if (event != NETDEV_UNREGISTER || !ipvs)
return NOTIFY_DONE;
IP_VS_DBG(3, "%s() dev=%s\n", __func__, dev->name);
EnterFunction(2);
@ -1551,7 +1552,7 @@ static int ip_vs_dst_event(struct notifier_block *this, unsigned long event,
}
}
list_for_each_entry(dest, &net_ipvs(net)->dest_trash, n_list) {
list_for_each_entry(dest, &ipvs->dest_trash, n_list) {
__ip_vs_dev_reset(dest, dev);
}
mutex_unlock(&__ip_vs_mutex);