netdev - Re: [PATCH net v4] l2tp: Serialize access to sk_user_data with sk_callback

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Date:   Wed, 16 Nov 2022 13:30:17 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Jakub Sitnicki <jakub@...udflare.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, tparkin@...alix.com,
        g1042620637@...il.com
Subject: Re: [PATCH net v4] l2tp: Serialize access to sk_user_data with
 sk_callback_lock

Hello:

This patch was applied to netdev/net.git (master)
by David S. Miller <davem@...emloft.net>:

On Mon, 14 Nov 2022 20:16:19 +0100 you wrote:
> sk->sk_user_data has multiple users, which are not compatible with each
> other. Writers must synchronize by grabbing the sk->sk_callback_lock.
> 
> l2tp currently fails to grab the lock when modifying the underlying tunnel
> socket fields. Fix it by adding appropriate locking.
> 
> We err on the side of safety and grab the sk_callback_lock also inside the
> sk_destruct callback overridden by l2tp, even though there should be no
> refs allowing access to the sock at the time when sk_destruct gets called.
> 
> [...]

Here is the summary with links:
  - [net,v4] l2tp: Serialize access to sk_user_data with sk_callback_lock
    https://git.kernel.org/netdev/net/c/b68777d54fac

You are awesome, thank you!
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