netdev - RE: [Patch bpf-next] skmsg: pass psock pointer to ->psock_update_sk

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Message-ID: <606f92a74c10a_c8b9208c1@john-XPS-13-9370.notmuch>
Date:   Thu, 08 Apr 2021 16:32:55 -0700
From:   John Fastabend <john.fastabend@...il.com>
To:     Cong Wang <xiyou.wangcong@...il.com>, netdev@...r.kernel.org
Cc:     bpf@...r.kernel.org, Cong Wang <cong.wang@...edance.com>,
        syzbot+320a3bc8d80f478c37e4@...kaller.appspotmail.com,
        John Fastabend <john.fastabend@...il.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jakub Sitnicki <jakub@...udflare.com>,
        Lorenz Bauer <lmb@...udflare.com>
Subject: RE: [Patch bpf-next] skmsg: pass psock pointer to
 ->psock_update_sk_prot()

Cong Wang wrote:
> From: Cong Wang <cong.wang@...edance.com>
> 
> Using sk_psock() to retrieve psock pointer from sock requires
> RCU read lock, but we already get psock pointer before calling
> ->psock_update_sk_prot() in both cases, so we can just pass it
> without bothering sk_psock().
> 
> Reported-and-tested-by: syzbot+320a3bc8d80f478c37e4@...kaller.appspotmail.com
> Fixes: 8a59f9d1e3d4 ("sock: Introduce sk->sk_prot->psock_update_sk_prot()")
> Cc: John Fastabend <john.fastabend@...il.com>
> Cc: Eric Dumazet <edumazet@...gle.com>
> Cc: Daniel Borkmann <daniel@...earbox.net>
> Cc: Jakub Sitnicki <jakub@...udflare.com>
> Cc: Lorenz Bauer <lmb@...udflare.com>
> Signed-off-by: Cong Wang <cong.wang@...edance.com>
> ---

Thanks.

Acked-by: John Fastabend <john.fastabend@...il.com>