linux-kernel - [PATCH 4.8 057/125] crypto: marvell - Update transformation context for each dequeued req

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Date:   Sat, 29 Oct 2016 09:49:35 -0400
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Romain Perier <romain.perier@...e-electrons.com>,
        Herbert Xu <herbert@...dor.apana.org.au>
Subject: [PATCH 4.8 057/125] crypto: marvell - Update transformation context for each dequeued req

4.8-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Romain Perier <romain.perier@...e-electrons.com>

commit 09951d83fc58a6f772de09c08e370f6d9970dbb6 upstream.

So far, sub part of mv_cesa_int was responsible of dequeuing complete
requests, then call the 'cleanup' operation on these reqs and call the
crypto api callback 'complete'. The problem is that the transformation
context 'ctx' is retrieved only once before the while loop. Which means
that the wrong 'cleanup' operation might be called on the wrong type of
cesa requests, it can lead to memory corruptions with this message:

marvell-cesa f1090000.crypto: dma_pool_free cesa_padding, 5a5a5a5a/5a5a5a5a (bad dma)

This commit fixes the issue, by updating the transformation context for
each dequeued cesa request.

Fixes: commit 85030c5168f1 ("crypto: marvell - Add support for chai...")
Signed-off-by: Romain Perier <romain.perier@...e-electrons.com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/crypto/marvell/cesa.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/crypto/marvell/cesa.c
+++ b/drivers/crypto/marvell/cesa.c
@@ -166,6 +166,7 @@ static irqreturn_t mv_cesa_int(int irq,
 			if (!req)
 				break;

+			ctx = crypto_tfm_ctx(req->tfm);
 			mv_cesa_complete_req(ctx, req, 0);
 		}
 	}