From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Miller Subject: Re: [PATCH v3] ip: fix truesize mismatch in ip fragmentation Date: Tue, 21 Sep 2010 15:15:34 -0700 (PDT) Message-ID: <20100921.151534.183050170.davem@davemloft.net> References: <20100921175014.GA2066@del.dom.local> <1285094865.2452.2.camel@edumazet-laptop> <20100921192154.GA2115@del.dom.local> Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: eric.dumazet@gmail.com, nbowler@elliptictech.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, kaber@trash.net To: jarkao2@gmail.com Return-path: In-Reply-To: <20100921192154.GA2115@del.dom.local> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org From: Jarek Poplawski Date: Tue, 21 Sep 2010 21:21:54 +0200 > On Tue, Sep 21, 2010 at 08:47:45PM +0200, Eric Dumazet wrote: >> [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 >> Tested-by: Nick Bowler >> Signed-off-by: Eric Dumazet >> CC: Jarek Poplawski >> CC: Patrick McHardy > > Looks perfect to me. Great work everyone! Applied, thanks.