linux-kernel - Re: [OOPS] In __netif_receive_skb

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Date:	Mon, 11 Jan 2016 17:19:05 -0800
From:	Salam Noureddine <noureddine@...sta.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Pali Rohár <pali.rohar@...il.com>,
	Network Development <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Sebastian Reichel <sre@...nel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>
Subject: Re: [OOPS] In __netif_receive_skb_core

It must be that skb->dev was changed to NULL inside of
__netif_receive_skb_core, otherwise we would have crashed much
earlier. Also, orig_dev is saved at the beginning. Possibly a device
is layered on top of the original device.

On Mon, Jan 11, 2016 at 5:06 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> On Tue, 2016-01-12 at 02:51 +0200, Ivaylo Dimitrov wrote:
>
>>
>> I put some additional printks around that code, and it turned out that
>> skb->dev is null, so "if (unlikely(skb->dev != orig_dev))" succeeds, but
>> "&skb->dev->ptype_specific" oopses.
>
> Nice find !
>
> Now lets find what possibly called netif_rx() with skb->dev == NULL
>
> (This is illegal)
>
>
>