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From:   Atul Gupta <atul.gupta@chelsio.com>
To:     herbert@gondor.apana.org.au
Cc:     linux-crypto@vger.kernel.org, davem@davemloft.net, dt@chelsio.com,
        atul.gupta@chelsio.com
Subject: [PATCH 3/4] crypto:chelsio count incomplete block in IV
Date:   Thu,  2 May 2019 03:47:57 -0700
Message-Id: <20190502104757.22234-1-atul.gupta@chelsio.com>
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Sender: linux-crypto-owner@vger.kernel.org
Precedence: bulk

The partial block should count as one and appropriately appended
to IV. eg 499B for AES CTR should count 32 block than 31 and
correct count value is updated in iv out.

Signed-off-by: Atul Gupta <atul.gupta@chelsio.com>
---
 drivers/crypto/chelsio/chcr_algo.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/crypto/chelsio/chcr_algo.c b/drivers/crypto/chelsio/chcr_algo.c
index 73bbd49..177f572 100644
--- a/drivers/crypto/chelsio/chcr_algo.c
+++ b/drivers/crypto/chelsio/chcr_algo.c
@@ -1094,8 +1094,8 @@ static int chcr_final_cipher_iv(struct ablkcipher_request *req,
 	int ret = 0;
 
 	if (subtype == CRYPTO_ALG_SUB_TYPE_CTR)
-		ctr_add_iv(iv, req->info, (reqctx->processed /
-			   AES_BLOCK_SIZE));
+		ctr_add_iv(iv, req->info, DIV_ROUND_UP(reqctx->processed,
+						       AES_BLOCK_SIZE));
 	else if (subtype == CRYPTO_ALG_SUB_TYPE_XTS)
 		ret = chcr_update_tweak(req, iv, 1);
 	else if (subtype == CRYPTO_ALG_SUB_TYPE_CBC) {
-- 
1.8.3.1