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Re: [ath9k-devel] [PATCH] ath9k: fix NULL-deref in hw_per_calibration() for ar9002

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On 2014-05-07 21:54, John W. Linville wrote:
> On Wed, May 07, 2014 at 09:22:58AM +0200, David Herrmann wrote:
>> ah->caldata may be NULL if no channel is selected. Check for that before
>> accessing it.
>> 
>> Signed-off-by: David Herrmann <dh.herrmann@xxxxxxxxx>
>> ---
>> Hi
>> 
>> This is _definitely_ only a workaround, given that no-one guarantees ah->caldata
>> is freed while we run in hw_per_calibration(). However, this patch fixes serious
>> kernel panics with wifi-P2P on my machine.
>> 
>> I'm not sure why ah->caldata can be NULL, but it definitely is. I think the
>> correct fix would be to synchronously stop any running hw-calibration before
>> setting ah->caldata to NULL. I don't know whether/where that is done, so I wrote
>> this small workaround.
>> 
>> Thanks
>> David
> 
> Is there any hope for getting a more complete fix from the ath9k guys
> in short order?
This looks easy to fix. I'll send a patch soon.

- Felix

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