linux-kernel - [PATCH 2/2] crypto: atmel-aes: check alignment of cfb64 mode

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Date:	Tue, 22 Apr 2014 15:23:24 +0800
From:	Leilei Zhao <leilei.zhao@...el.com>
To:	<herbert@...dor.apana.org.au>, <davem@...emloft.net>
CC:	<linux-crypto@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<nicolas@...rea.com>, <nicolas.ferre@...el.com>,
	<leilei.zhao@...el.com>
Subject: [PATCH 2/2] crypto: atmel-aes: check alignment of cfb64 mode

The length shoule be 64 bit alignment and the block size shoule be 64 bit in aes cfb64 mode.

Signed-off-by: Leilei Zhao <leilei.zhao@...el.com>
---
 drivers/crypto/atmel-aes.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/crypto/atmel-aes.c b/drivers/crypto/atmel-aes.c
index 12628a7..a083474 100644
--- a/drivers/crypto/atmel-aes.c
+++ b/drivers/crypto/atmel-aes.c
@@ -716,6 +716,12 @@ static int atmel_aes_crypt(struct ablkcipher_request *req, unsigned long mode)
 			return -EINVAL;
 		}
 		ctx->block_size = CFB32_BLOCK_SIZE;
+	} else if (mode & AES_FLAGS_CFB64) {
+		if (!IS_ALIGNED(req->nbytes, CFB64_BLOCK_SIZE)) {
+			pr_err("request size is not exact amount of CFB64 blocks\n");
+			return -EINVAL;
+		}
+		ctx->block_size = CFB64_BLOCK_SIZE;
 	} else {
 		if (!IS_ALIGNED(req->nbytes, AES_BLOCK_SIZE)) {
 			pr_err("request size is not exact amount of AES blocks\n");
-- 
1.7.9.5

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