netdev - Re: [PATCH] bridge: Fix br_should_learn to check vlan

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Date:	Tue, 16 Sep 2014 23:02:43 +0900
From:	Toshiaki Makita <toshiaki.makita1@...il.com>
To:	Toshiaki Makita <makita.toshiaki@....ntt.co.jp>,
	David Miller <davem@...emloft.net>, vyasevich@...il.com
CC:	netdev@...r.kernel.org, vyasevic@...hat.com
Subject: Re: [PATCH] bridge: Fix br_should_learn to check vlan_enabled

(14/09/16 (火) 19:40), Toshiaki Makita wrote:
> On 2014/09/16 6:38, David Miller wrote:
>> From: Vladislav Yasevich <vyasevich@...il.com>
>> Date: Mon, 15 Sep 2014 15:24:26 -0400
>>
>>> As Toshiaki Makita pointed out, the BRIDGE_INPUT_SKB_CB will
>>> not be initialized in br_should_learn() as that function
>>> is called only from br_handle_local_finish().  That is
>>> an input handler for link-local ethernet traffic so it perfectly
>>> correct to check br->vlan_enabled here.
>>>
>>> Reported-by: Toshiaki Makita<toshiaki.makita1@...il.com>
>>> Fixes: 20adfa1 bridge: Check if vlan filtering is enabled only once.
>>> Signed-off-by: Vladislav Yasevich <vyasevic@...hat.com>
>>
>> Applied, thanks Vlad.
>
> Hi David,
>
> Could you queue this for -stable as well?
> Without this, FDB can be poisoned by disallowed ports.
> (the same problem as stated in e0d7968ab6c8 "bridge: Prevent insertion
> of FDB entry with disallowed vlan")

I'm sorry, I was confusued.
This doesn't cause that problem, because if vlan_filtered is 0, fdb is 
always updated with vid 0. Such an entry is never used as long as 
vlan_filtering is enabled.
Please ignore my previous mail.

Thanks,
Toshiaki Makita
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