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net: Lock netdevices during dev_shutdown

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__qdisc_destroy() calls into various qdiscs .destroy() op, which in turn
can call .ndo_setup_tc(), which requires the netdev instance lock.

This commit extends the critical section in
unregister_netdevice_many_notify() to cover dev_shutdown() (and
dev_tcx_uninstall() as a side-effect) and acquires the netdev instance
lock in __dev_change_net_namespace() for the other dev_shutdown() call.

This should now guarantee that for all qdisc ops, the netdev instance
lock is held during .ndo_setup_tc().

Fixes: a0527ee2df ("net: hold netdev instance lock during qdisc ndo_setup_tc")
Signed-off-by: Cosmin Ratiu <cratiu@nvidia.com>
Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Link: https://patch.msgid.link/20250505194713.1723399-1-cratiu@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Cosmin Ratiu 2025-05-05 22:47:13 +03:00 • committed by Jakub Kicinski
parent 0093cb194a
commit 08e9f2d584
1 changed files with 3 additions and 1 deletions
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4
net/core/dev.c
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@ -11966,9 +11966,9 @@ void unregister_netdevice_many_notify(struct list_head *head,
struct sk_buff *skb = NULL;
/* Shutdown queueing discipline. */
netdev_lock_ops(dev);
dev_shutdown(dev);
dev_tcx_uninstall(dev);
netdev_lock_ops(dev);
dev_xdp_uninstall(dev);
dev_memory_provider_uninstall(dev);
netdev_unlock_ops(dev);
@ -12161,7 +12161,9 @@ int __dev_change_net_namespace(struct net_device *dev, struct net *net,
synchronize_net();
/* Shutdown queueing discipline. */
netdev_lock_ops(dev);
dev_shutdown(dev);
netdev_unlock_ops(dev);
/* Notify protocols, that we are about to destroy
* this device. They should clean all the things.