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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,
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        linux-arm-kernel@axis.com, Andrei Botila <andrei.botila@nxp.com>,
        Heiko Carstens <heiko.carstens@de.ibm.com>,
        Vasily Gorbik <gor@linux.ibm.com>,
        Christian Borntraeger <borntraeger@de.ibm.com>
Subject: [PATCH 07/22] crypto: s390/paes - add check for xts input length equal to zero
Date:   Fri,  7 Aug 2020 19:19:55 +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: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Andrei Botila <andrei.botila@nxp.com>
---
 arch/s390/crypto/paes_s390.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/s390/crypto/paes_s390.c b/arch/s390/crypto/paes_s390.c
index f3caeb17c85b..7f0861c6f019 100644
--- a/arch/s390/crypto/paes_s390.c
+++ b/arch/s390/crypto/paes_s390.c
@@ -494,6 +494,9 @@ static int xts_paes_crypt(struct skcipher_request *req, unsigned long modifier)
 		u8 init[16];
 	} xts_param;
 
+	if (!req->cryptlen)
+		return 0;
+
 	ret = skcipher_walk_virt(&walk, req, false);
 	if (ret)
 		return ret;
-- 
2.17.1