netdev - Re: Linux 3.1-rc9

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Date:	Wed, 02 Nov 2011 18:58:21 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Simon Kirby <sim@...tway.ca>, David Miller <davem@...emloft.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Network Development <netdev@...r.kernel.org>
Subject: Re: Linux 3.1-rc9

Le mercredi 02 novembre 2011 à 18:49 +0100, Eric Dumazet a écrit :
> Le mercredi 02 novembre 2011 à 18:27 +0100, Eric Dumazet a écrit :
> 
> > I believe it might come from commit 0e734419
> > (ipv4: Use inet_csk_route_child_sock() in DCCP and TCP.)
> > 
> > In case inet_csk_route_child_sock() returns NULL, we dont release socket
> > lock.
> > 
> > 
> 
> Yes, thats the problem. I am testing following patch :
> 
> diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
> index 0ea10ee..683d97a 100644
> --- a/net/ipv4/tcp_ipv4.c
> +++ b/net/ipv4/tcp_ipv4.c
> @@ -1510,6 +1510,7 @@ exit:
>  	NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
>  	return NULL;
>  put_and_exit:
> +	bh_unlock_sock(newsk);
>  	sock_put(newsk);
>  	goto exit;
>  }
> 


This indeed solves the problem, but more closer inspection is needed to
close all bugs, not this only one.

# netstat -s
Ip:
    6961157 total packets received
    0 forwarded
    0 incoming packets discarded
    6961157 incoming packets delivered
    6961049 requests sent out
    2 dropped because of missing route    //// HERE, this is the origin



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