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

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Date:   Wed, 26 Apr 2017 13:53:23 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Willem de Bruijn <willemb@...gle.com>
Subject: Re: [PATCH net-next] bpf: restore skb->sk before pskb_trim() call

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>