net: force a list_del() in unregister_netdevice_many()

[ Upstream commit 87757a917b0b3c0787e0563c679762152be81312 ]

unregister_netdevice_many() API is error prone and we had too
many bugs because of dangling LIST_HEAD on stacks.

See commit f87e6f47933e3e ("net: dont leave active on stack LIST_HEAD")

In fact, instead of making sure no caller leaves an active list_head,
just force a list_del() in the callee. No one seems to need to access
the list after unregister_netdevice_many()

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 20bb669..5adecc5 100644 (file)
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -1043,7 +1043,6 @@ static int macvlan_device_event(struct notifier_block *unused,
                list_for_each_entry_safe(vlan, next, &port->vlans, list)
                        vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
                unregister_netdevice_many(&list_kill);
-               list_del(&list_kill);
                break;
        case NETDEV_PRE_TYPE_CHANGE:
                /* Forbid underlaying device to change its type. */

diff --git a/net/core/dev.c b/net/core/dev.c
index fccc195..4c1b483 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6548,6 +6548,9 @@ EXPORT_SYMBOL(unregister_netdevice_queue);
 /**
  *     unregister_netdevice_many - unregister many devices
  *     @head: list of devices
+ *
+ *  Note: As most callers use a stack allocated list_head,
+ *  we force a list_del() to make sure stack wont be corrupted later.
  */
 void unregister_netdevice_many(struct list_head *head)
 {
@@ -6557,6 +6560,7 @@ void unregister_netdevice_many(struct list_head *head)
                rollback_registered_many(head);
                list_for_each_entry(dev, head, unreg_list)
                        net_set_todo(dev);
+               list_del(head);
        }
 }
 EXPORT_SYMBOL(unregister_netdevice_many);
@@ -7012,7 +7016,6 @@ static void __net_exit default_device_exit_batch(struct list_head *net_list)
                }
        }
        unregister_netdevice_many(&dev_kill_list);
-       list_del(&dev_kill_list);
        rtnl_unlock();
 }
 

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 5cb7220..473e7e9 100644 (file)
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1735,7 +1735,6 @@ static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
 
        ops->dellink(dev, &list_kill);
        unregister_netdevice_many(&list_kill);
-       list_del(&list_kill);
        return 0;
 }
 

diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index ce1c443..8f7fabc 100644 (file)
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -1761,7 +1761,6 @@ void ieee80211_remove_interfaces(struct ieee80211_local *local)
        }
        mutex_unlock(&local->iflist_mtx);
        unregister_netdevice_many(&unreg_list);
-       list_del(&unreg_list);
 
        list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
                list_del(&sdata->list);