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From:   Andrei Botila <andrei.botila@oss.nxp.com>
To:     Herbert Xu <herbert@gondor.apana.org.au>,
        "David S. Miller" <davem@davemloft.net>
Cc:     linux-crypto@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
        linux-s390@vger.kernel.org, x86@kernel.org,
        linux-arm-kernel@axis.com, Andrei Botila <andrei.botila@nxp.com>,
        Tom Lendacky <thomas.lendacky@amd.com>,
        John Allen <john.allen@amd.com>
Subject: [PATCH 15/22] crypto: ccp - add check for xts input length equal to zero
Date:   Fri,  7 Aug 2020 19:20:03 +0300
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From: Andrei Botila <andrei.botila@nxp.com>

Standardize the way input lengths equal to 0 are handled in all skcipher
algorithms. All the algorithms return 0 for input lengths equal to zero.

Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: John Allen <john.allen@amd.com>
Signed-off-by: Andrei Botila <andrei.botila@nxp.com>
---
 drivers/crypto/ccp/ccp-crypto-aes-xts.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/crypto/ccp/ccp-crypto-aes-xts.c b/drivers/crypto/ccp/ccp-crypto-aes-xts.c
index 6849261ca47d..6a93b54d388a 100644
--- a/drivers/crypto/ccp/ccp-crypto-aes-xts.c
+++ b/drivers/crypto/ccp/ccp-crypto-aes-xts.c
@@ -113,6 +113,9 @@ static int ccp_aes_xts_crypt(struct skcipher_request *req,
 	u32 unit_size;
 	int ret;
 
+	if (!req->cryptlen)
+		return 0;
+
 	if (!ctx->u.aes.key_len)
 		return -EINVAL;
 
-- 
2.17.1