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

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Message-Id: <20170430.222338.928694349414886238.davem@davemloft.net>
Date:   Sun, 30 Apr 2017 22:23:38 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     eric.dumazet@...il.com
Cc:     netdev@...r.kernel.org, andreyknvl@...gle.com, willemb@...gle.com
Subject: Re: [PATCH net-next] bpf: restore skb->sk before pskb_trim() call

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 26 Apr 2017 09:09:23 -0700

> 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>

Applied, thanks Eric.