netdev - Re: [PATCH net-next] bpf: restore skb->sk before pskb

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Date:   Wed, 26 Apr 2017 21:30:20 -0400
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Eric Dumazet <eric.dumazet@...il.com>,
        David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: Re: [PATCH net-next] bpf: restore skb->sk before pskb_trim() call

On Wed, Apr 26, 2017 at 4:53 PM, Alexei Starovoitov
<alexei.starovoitov@...il.com> wrote:
> On Wed, Apr 26, 2017 at 09:09:23AM -0700, Eric Dumazet wrote:
>> From: Eric Dumazet <edumazet@...gle.com>
>>
>> While testing a fix [1] in ___pskb_trim(), addressing the WARN_ON_ONCE()
>> in skb_try_coalesce() reported by Andrey, I found that we had an skb
>> with skb->sk set but no skb->destructor.
>>
>> This invalidated heuristic found in commit 158f323b9868 ("net: adjust
>> skb->truesize in pskb_expand_head()") and in cited patch.
>>
>> Considering the BUG_ON(skb->sk) we have in skb_orphan(), we should
>> restrain the temporary setting to a minimal section.
>>
>> [1] https://patchwork.ozlabs.org/patch/755570/
>>     net: adjust skb->truesize in ___pskb_trim()
>>
>> Fixes: 8f917bba0042 ("bpf: pass sk to helper functions")
>> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
>> Cc: Willem de Bruijn <willemb@...gle.com>
>> Cc: Andrey Konovalov <andreyknvl@...gle.com>
>
> Ahh. Thanks for the fix.
> Acked-by: Alexei Starovoitov <ast@...nel.org>

Acked-by: Willem de Bruijn <willemb@...gle.com>

Thanks, Eric.