[PATCH] mac80211: fix low throughput due to invalid addba extension

[Govindaraj Saminathan]

On 2021-03-16 23:15, Govindaraj Saminathan wrote:
> On 2021-03-16 21:21, Johannes Berg wrote:
>> On Tue, 2021-03-16 at 21:17 +0530, Govindaraj wrote:
>>> Addba request action frame received with the extension element from
>>> certain 11ac stations,
>>> 
>> 
>> Please indicate which so we have a record of who's shipping broken 
>> junk.
The below log i taken with pixel3 client device
>> 
>>> but the cmd id and length not matching to addba
>>> extension and it failing in element parsing.
>> 
>>> Due to this, addba request
>>> not acknowledged and aggregation not started which is causing low
>>> throughput. Hence validating the cmd id before processing addba 
>>> extension.
>> 
>>>  	ies_len = len - offsetof(struct ieee80211_mgmt,
>>>  				 u.action.u.addba_req.variable);
>>> -	if (ies_len) {
>>> +	if (ies_len &&
>>> +	    mgmt->u.action.u.addba_req.variable[0] == WLAN_EID_ADDBA_EXT) {
>>>  		ieee802_11_parse_elems(mgmt->u.action.u.addba_req.variable,
>>>                                  ies_len, true, &elems, mgmt->bssid, 
>>> NULL);
>>>  		if (elems.parse_error)
>> 
>> So we get into parse_error without this?
> yes, we getting parse error.
>> 
>> What are they putting there instead?
> first 9 bytes are addba request action frame and remaining 7 bytes
> extension causing for parse error.
> 03 00 01 02 10 00 00 e0 0a cf 08 06 11a 46 09 fe
>> 
>> johannes