netdev - Re: [PATCH v3] ip: fix truesize mismatch in ip fragmentation

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Message-ID: <20100921192154.GA2115@del.dom.local>
Date:	Tue, 21 Sep 2010 21:21:54 +0200
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Nick Bowler <nbowler@...iptictech.com>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH v3] ip: fix truesize mismatch in ip fragmentation

On Tue, Sep 21, 2010 at 08:47:45PM +0200, Eric Dumazet wrote:
> 
> > Looks better and better to me, except, checkpatch complains about the
> > (existing) indentation fault here (and later), but I guess you've seen
> > that?
> > 
> 
> Indeed, there is checkpatch somewhere ;)
> 
> Thanks !
> 
> [PATCH v4] ip: fix truesize mismatch in ip fragmentation
> 
> Special care should be taken when slow path is hit in ip_fragment() :
> 
> When walking through frags, we transfert truesize ownership from skb to
> frags. Then if we hit a slow_path condition, we must undo this or risk
> uncharging frags->truesize twice, and in the end, having negative socket
> sk_wmem_alloc counter, or even freeing socket sooner than expected.
> 
> Many thanks to Nick Bowler, who provided a very clean bug report and
> test program.
> 
> Thanks to Jarek for reviewing my first patch and providing a V2
> 
> While Nick bisection pointed to commit 2b85a34e911 (net: No more
> expensive sock_hold()/sock_put() on each tx), underlying bug is older
> (2.6.12-rc5)
> 
> A side effect is to extend work done in commit b2722b1c3a893e
> (ip_fragment: also adjust skb->truesize for packets not owned by a
> socket) to ipv6 as well.
> 
> Reported-and-bisected-by: Nick Bowler <nbowler@...iptictech.com>
> Tested-by: Nick Bowler <nbowler@...iptictech.com>
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> CC: Jarek Poplawski <jarkao2@...il.com>
> CC: Patrick McHardy <kaber@...sh.net>

Looks perfect to me.

Jarek P.
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