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authorPatrick McHardy <kaber@trash.net>2008-07-03 03:53:42 -0700
committerDavid S. Miller <davem@davemloft.net>2008-07-03 03:53:42 -0700
commitab1b20467cd2214ad89a95d007047cd2a6b5bf5d (patch)
treed6cb28dab25eada6f2963d23afd284d0b899bab5
parent374e7b59498ce0785b3727794b351221528a5159 (diff)
bridge: fix use-after-free in br_cleanup_bridges()
Unregistering a bridge device may cause virtual devices stacked on the bridge, like vlan or macvlan devices, to be unregistered as well. br_cleanup_bridges() uses for_each_netdev_safe() to iterate over all devices during cleanup. This is not enough however, if one of the additionally unregistered devices is next in the list to the bridge device, it will get freed as well and the iteration continues on the freed element. Restart iteration after each bridge device removal from the beginning to fix this, similar to what rtnl_link_unregister() does. Signed-off-by: Patrick McHardy <kaber@trash.net> Acked-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/bridge/br_if.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
index c2397f503b0..f38cc5317b8 100644
--- a/net/bridge/br_if.c
+++ b/net/bridge/br_if.c
@@ -442,12 +442,16 @@ int br_del_if(struct net_bridge *br, struct net_device *dev)
void __exit br_cleanup_bridges(void)
{
- struct net_device *dev, *nxt;
+ struct net_device *dev;
rtnl_lock();
- for_each_netdev_safe(&init_net, dev, nxt)
- if (dev->priv_flags & IFF_EBRIDGE)
+restart:
+ for_each_netdev(&init_net, dev) {
+ if (dev->priv_flags & IFF_EBRIDGE) {
del_br(dev->priv);
+ goto restart;
+ }
+ }
rtnl_unlock();
}