netdev - Re: [PATCH] bonding: clear header_ops when last slave detached (v2)

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Message-ID: <1416375565.14060.43.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Tue, 18 Nov 2014 21:39:25 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Wengang Wang <wen.gang.wang@...cle.com>
Cc:	wwgwork@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH] bonding: clear header_ops when last slave detached (v2)

On Wed, 2014-11-19 at 13:18 +0800, Wengang Wang wrote:
> When last slave of a bonding master is removed, the bonding then does not work.
> When packet_snd is called against with a master net_device, it accesses
> header_ops. In case the header_ops is not valid any longer(say ipoib module
> unloaded), it will then access an invalid memory address.
> This patch try to fix this issue by clearing header_ops when last slave
> detached.
> 
> Signed-off-by: Wengang Wang <wen.gang.wang@...cle.com>
> ---
>  drivers/net/bonding/bond_main.c | 1 +
>  1 file changed, 1 insertion(+)

It seems you basically ignored my feedback.



Some code is doing :

[A] if (dev->header_ops) {
    ...
[B]    dev->header_ops->XXX()



Nothing prevents you doing the clear after [A] , and before [B]



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