netdev - Re: [PATCH net] bonding: fix bond dev flags after convert to arphrd

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Message-ID: <55A6C8DB.30904@cumulusnetworks.com>
Date:	Wed, 15 Jul 2015 22:55:55 +0200
From:	Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To:	Nikolay Aleksandrov <razor@...ckwall.org>, netdev@...r.kernel.org
CC:	monis@...taire.com, j.vosburgh@...il.com,
	gospo@...ulusnetworks.com, vfalico@...il.com, davem@...emloft.net
Subject: Re: [PATCH net] bonding: fix bond dev flags after convert to arphrd_ether

On 07/15/2015 10:09 PM, Nikolay Aleksandrov wrote:
> From: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
> 
> If a bonding device enslaves devices != arphrd_ether it'll change types
> and if later these devices are released, it can enslave an arphrd_ether
> device and switch back calling ether_setup() which resets dev->flags to
> IFF_BROADCAST|IFF_MULTICAST and clears IFF_MASTER which then could lead
> to many different bugs. This bug seems to have been there since the
> introduction of ether_setup() in bond_enslave().
> 
> Signed-off-by: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
> Fixes: e36b9d16c6a6 ("bonding: clean muticast addresses when device changes type")
> ---
>  drivers/net/bonding/bond_main.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
> index 317a49480475..8ba119896e55 100644
> --- a/drivers/net/bonding/bond_main.c
> +++ b/drivers/net/bonding/bond_main.c
> @@ -1368,6 +1368,7 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
>  				bond_setup_by_slave(bond_dev, slave_dev);
>  			else {
>  				ether_setup(bond_dev);
> +				bond_dev->flags |= IFF_MASTER;
>  				bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
>  			}
>  
> 

Dave please ignore this patch, I'll send a better fix.

Thanks,
 Nik
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