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From:   Thara Gopinath <thara.gopinath@linaro.org>
To:     herbert@gondor.apana.org.au, davem@davemloft.net,
        bjorn.andersson@linaro.org
Cc:     ebiggers@google.com, ardb@kernel.org, sivaprak@codeaurora.org,
        linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v6 05/11] crypto: qce: skcipher: Return error for zero length messages
Date:   Sun,  7 Feb 2021 09:39:40 -0500
Message-Id: <20210207143946.2099859-6-thara.gopinath@linaro.org>
In-Reply-To: <20210207143946.2099859-1-thara.gopinath@linaro.org>
References: <20210207143946.2099859-1-thara.gopinath@linaro.org>
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Crypto engine BAM dma does not support 0 length data. Return unsupported
if zero length messages are passed for transformation.

Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org>
---

v5->v6:
	- Return 0 for zero length messages instead of -EOPNOTSUPP in the
	  cipher algorithms as pointed out by Eric Biggers.

 drivers/crypto/qce/skcipher.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/crypto/qce/skcipher.c b/drivers/crypto/qce/skcipher.c
index de1f37ed4ee6..96af40c2c8f3 100644
--- a/drivers/crypto/qce/skcipher.c
+++ b/drivers/crypto/qce/skcipher.c
@@ -8,6 +8,7 @@
 #include <linux/interrupt.h>
 #include <linux/moduleparam.h>
 #include <linux/types.h>
+#include <linux/errno.h>
 #include <crypto/aes.h>
 #include <crypto/internal/des.h>
 #include <crypto/internal/skcipher.h>
@@ -260,6 +261,10 @@ static int qce_skcipher_crypt(struct skcipher_request *req, int encrypt)
 	rctx->flags |= encrypt ? QCE_ENCRYPT : QCE_DECRYPT;
 	keylen = IS_XTS(rctx->flags) ? ctx->enc_keylen >> 1 : ctx->enc_keylen;
 
+	/* CE does not handle 0 length messages */
+	if (!req->cryptlen)
+		return 0;
+
 	/* qce is hanging when AES-XTS request len > QCE_SECTOR_SIZE and
 	 * is not a multiple of it; pass such requests to the fallback
 	 */
-- 
2.25.1