netdev - Re: [PATCH v3 net 2/2] net: Remove WARN_ON_ONCE(sk->sk_forward_alloc) from sk_stream_kill

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Date:   Fri, 10 Feb 2023 15:13:10 +0100
From:   Eric Dumazet <edumazet@...gle.com>
To:     Kuniyuki Iwashima <kuniyu@...zon.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Kuniyuki Iwashima <kuni1840@...il.com>, netdev@...r.kernel.org,
        syzbot <syzkaller@...glegroups.com>,
        Christoph Paasch <christophpaasch@...oud.com>,
        Matthieu Baerts <matthieu.baerts@...sares.net>
Subject: Re: [PATCH v3 net 2/2] net: Remove WARN_ON_ONCE(sk->sk_forward_alloc)
 from sk_stream_kill_queues().

On Fri, Feb 10, 2023 at 1:23 AM Kuniyuki Iwashima <kuniyu@...zon.com> wrote:
>
> Christoph Paasch reported that commit b5fc29233d28 ("inet6: Remove
> inet6_destroy_sock() in sk->sk_prot->destroy().") started triggering
> WARN_ON_ONCE(sk->sk_forward_alloc) in sk_stream_kill_queues().  [0 - 2]
> Also, we can reproduce it by a program in [3].
>
> In the commit, we delay freeing ipv6_pinfo.pktoptions from sk->destroy()
> to sk->sk_destruct(), so sk->sk_forward_alloc is no longer zero in
> inet_csk_destroy_sock().
>
Reviewed-by: Eric Dumazet <edumazet@...gle.com>

Thanks !