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Date:	Sat, 23 May 2015 14:09:09 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Julian Anastasov <ja@....bg>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	"Vittorio G (VittGam)" <linuxbugs@...tgam.net>,
	security@...nel.org, Greg KH <greg@...ah.com>, luto@...capital.net,
	Willy Tarreau <w@....eu>
Subject: Re: [PATCH net] ipv4: Avoid crashing in ip_error

On Sat, 2015-05-23 at 21:48 +0300, Julian Anastasov wrote:
> 	Hello,
> 
> On Sat, 23 May 2015, Eric W. Biederman wrote:
> 
> > Perhaps it is possible to transmit into a veth pair even when the
> > carrier is down?  Which could be a bug in the veth driver.
> 
> 	Not sure if that can help but both RCU_INIT_POINTER
> calls in veth_dellink can be before the unregister_netdevice_queue
> ones. May be it will help for the case when veth_dellink is
> called with head=NULL. As result, veth_xmit will free all
> flying skbs to peer that is unregistered first.

Good point, but note that we never call dellink() method with head==NULL
in current kernels.




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