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Re: [PATCH] mac80211: Don't inspect Sequence Control field on control frames

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Johannes,

On Thu, Oct 25, 2012 at 12:03 PM, Johannes Berg
<johannes@xxxxxxxxxxxxxxxx> wrote:
> On Thu, 2012-10-25 at 11:10 -0700, Javier Cardona wrote:
>> Per IEEE Std. 802.11-2012, Sec 8.2.4.4.1, the sequence Control field is
>> not present in control frames.  We noticed this problem when processing
>> Block Ack Requests.
>>
>
> Cc stable?

Sure.

>>       hdr = (struct ieee80211_hdr *)rx->skb->data;
>>       fc = hdr->frame_control;
>> +
>> +     if (ieee80211_is_ctl(fc))
>> +             return RX_CONTINUE;
>
> Shouldn't that be "goto out"?

If we goto out, we'll increment the rx_packets counter, which
according to sta_info.h should only count MSDUs.

> And it seems it should also incorporate the skb->len check here, rather than accessing the field before checking
> that it's present?

ieee80211_rx_h_check() zaps all skbs with len < 16, so I don't think
it's needed, no?

Javier

-- 
Javier Cardona
cozybit Inc.
http://www.cozybit.com
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