netdev - Re: [net-next PATCH] qdisc: validate frames going through the direct

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Message-ID: <1409751805.26422.32.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Wed, 03 Sep 2014 06:43:25 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jesper Dangaard Brouer <brouer@...hat.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Alexander Duyck <alexander.duyck@...il.com>,
	netdev@...r.kernel.org
Subject: Re: [net-next PATCH] qdisc: validate frames going through the
 direct_xmit path

On Wed, 2014-09-03 at 13:48 +0200, Jesper Dangaard Brouer wrote:
> In commit 50cbe9ab5f8d ("net: Validate xmit SKBs right when we pull them
> out of the qdisc") the validation code was moved out of dev_hard_start_xmit
> and into dequeue_skb. However this overlooked the fact that we do not
> always enqueue the skb onto a qdisc, if qdisc have flag TCQ_F_CAN_BYPASS.
> 
> As a result Alex was seeing issues trying to connect to a vhost_net interface
> after this patch was applied.
> 
> Added a call to validate_xmit_skb in __dev_xmit_skb(), in the code path
> for qdiscs with TCQ_F_CAN_BYPASS flag.
> 
> Fixes:  50cbe9ab5f8d ("net: Validate xmit SKBs right when we pull them out of the qdisc")
> Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>
> Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>
> ---

Jesper, you missed another spot, when there is no qdisc on the device.

__dev_queue_xmit() calls dev_hard_start_xmit() around line 2886

Could we try to not add a myriad of small patches ?

Some of us will need to backport all of them.

Thanks.


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