netdev - Re: [PATCH net] ipv4: Avoid crashing in ip

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Message-ID: <alpine.LFD.2.11.1505232131230.1796@ja.home.ssi.bg>
Date:	Sat, 23 May 2015 21:48:55 +0300 (EEST)
From:	Julian Anastasov <ja@....bg>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
cc:	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


	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.

Regards

--
Julian Anastasov <ja@....bg>
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