Re: [PATCH net v3] net/packet: avoid fanout hook re-registration after unregister

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@xxxxxxxxxx>:

On Tue,  7 Jul 2026 10:44:37 +0000 you wrote:
> packet_set_ring() temporarily detaches a socket from packet delivery while
> reconfiguring its ring. It records the previous running state, clears
> po->num, unregisters the protocol hook when needed, drops po->bind_lock,
> and later restores po->num and re-registers the hook from the saved
> was_running value.
> 
> That unlocked window can race with NETDEV_UNREGISTER. The notifier can
> observe the socket as not running, skip __unregister_prot_hook(), and
> invalidate the per-socket binding by setting po->ifindex to -1 and clearing
> po->prot_hook.dev. A one-member fanout group can still retain its shared
> fanout hook device pointer. When packet_set_ring() resumes, re-registering
> solely from the stale was_running state can re-add the fanout hook after
> the device has been unregistered.
> 
> [...]

Here is the summary with links:
  - [net,v3] net/packet: avoid fanout hook re-registration after unregister
    https://git.kernel.org/netdev/net/c/50aff80475ab

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html