netdev - Re: [PATCH net-next] net: bail on sock_wfree, sock_rfree when we have a TCP

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Date:	Wed, 1 Jul 2015 17:05:21 -0700
From:	Alex Gartrell <alexgartrell@...il.com>
To:	Eric Dumazet <edumazet@...gle.com>
Cc:	David Miller <davem@...emloft.net>,
	"agartrell@...com" <agartrell@...com>,
	netdev <netdev@...r.kernel.org>, kernel-team <kernel-team@...com>
Subject: Re: [PATCH net-next] net: bail on sock_wfree, sock_rfree when we have
 a TCP_TIMEWAIT sk

On Wed, Jul 1, 2015 at 4:26 PM, Eric Dumazet <edumazet@...gle.com> wrote:
> I think you are mistaken Alex.

Indeed, I was!  Should be unsurpising.

>
> socket early demux cannot possibly set skb->destructor to sock_rfree()

Yeah I will admit adding the code to sock_rfree reflexively out of paranoia.

> If skb->destructor is set by early demux, it correctly points to sock_edemux()
>
> And this one correctly handles all socket variants.

Yes, the problem appears to be in ip_vs_prepare_tunneled_skb
(ip_vs_xmit.c:859 in 4.0)

        if (skb_headroom(skb) < max_headroom || skb_cloned(skb)) {
                new_skb = skb_realloc_headroom(skb, max_headroom);
                if (!new_skb)
                        goto error;
                if (skb->sk)
                        skb_set_owner_w(new_skb, skb->sk);
                consume_skb(skb);
                skb = new_skb;
        }

skb_set_owner_w sets sock_wfree.

I'll figure out how to ensure that we're using an appropriate destructor here.

Appreciate the patience!

-- 
Alex Gartrell <agartrell@...com>
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