[PATCH] crypto: marvell: properly handle CRYPTO_TFM_REQ_MAY_BACKLOG-flagged requests

[Herbert Xu]

On Fri, Sep 18, 2015 at 05:25:36PM +0200, Thomas Petazzoni wrote:
> The mv_cesa_queue_req() function calls crypto_enqueue_request() to
> enqueue a request. In the normal case (i.e the queue isn't full), this
> function returns -EINPROGRESS. The current Marvell CESA crypto driver
> takes this into account and cleans up the request only if an error
> occured, i.e if the return value is not -EINPROGRESS.
> 
> Unfortunately this causes problems with
> CRYPTO_TFM_REQ_MAY_BACKLOG-flagged requests. When such a request is
> passed to crypto_enqueue_request() and the queue is full,
> crypto_enqueue_request() will return -EBUSY, but will keep the request
> enqueued nonetheless. This situation was not properly handled by the
> Marvell CESA driver, which was anyway cleaning up the request in such
> a situation. When later on the request was taken out of the backlog
> and actually processed, a kernel crash occured due to the internal
> driver data structures for this structure having been cleaned up.
> 
> To avoid this situation, this commit adds a
> mv_cesa_req_needs_cleanup() helper function which indicates if the
> request needs to be cleaned up or not after a call to
> crypto_enqueue_request(). This helper allows to do the cleanup only in
> the appropriate cases, and all call sites of mv_cesa_queue_req() are
> fixed to use this new helper function.
> 
> Reported-by: Vincent Donnefort <vdonnefort at gmail.com>
> Fixes: db509a45339fd ("crypto: marvell/cesa - add TDMA support")
> Cc: <stable at vger.kernel.org> # v4.2+
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>

Applied to crypto.
-- 
Email: Herbert Xu <herbert at gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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