netdev - Re: Crypto oops in async_chainiv_do

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Date:	Wed, 2 Sep 2009 08:17:21 +1000
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Brad Bosch <bradbosch@...cast.net>
Cc:	linux-crypto@...r.kernel.org, netdev@...r.kernel.org,
	offbase0@...il.com
Subject: Re: Crypto oops in async_chainiv_do_postponed

On Tue, Sep 01, 2009 at 10:42:44AM -0500, Brad Bosch wrote:
> 
> Now, ctx-err may be used by both async_chainiv_postpone_request to
> store the return value from skcipher_enqueue_givcrypt and by
> async_chainiv_givencrypt_tail to store the return value from
> crypto_ablkcipher_encrypt at the same time.  This can cause the
> calling function to think async_chainiv_givencrypt has completed it's
> work, when in fact, the work was defered.

async_chainiv_postpone_request never touches ctx->err unless
it can obtain the INUSE bit lock.  On the other hand, the normal
patch async_chainiv_givencrypt_tail never relinquishes the INUSE
bit until it is finisehd with ctx->err.
 
> OK.  I see now that your offset patch should indeed solve that
> problem.  But why did you choose to fix it in a complex way?  My
> suggestion just adds a single test while yours adds new parameters, a
> new function and an extra function call.

Because that introduces two NULL checks where the second one is
useless.  Not a big deal but then again, my patch wasn't that
complicated either :)

Please let me know whether it actually fixes your problem though
so I can get this upstream.

Thanks,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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