linux-kernel - [PATCH 02/22] crypto: arm/aes-neonbs - add check for xts input length equal to zero

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Date:   Fri,  7 Aug 2020 19:19:50 +0300
From:   Andrei Botila <andrei.botila@....nxp.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>
Cc:     linux-crypto@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-s390@...r.kernel.org, x86@...nel.org,
        linux-arm-kernel@...s.com, Andrei Botila <andrei.botila@....com>,
        Russell King <linux@...linux.org.uk>
Subject: [PATCH 02/22] crypto: arm/aes-neonbs - add check for xts input length equal to zero

From: Andrei Botila <andrei.botila@....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: Russell King <linux@...linux.org.uk>
Signed-off-by: Andrei Botila <andrei.botila@....com>
---
 arch/arm/crypto/aes-neonbs-glue.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm/crypto/aes-neonbs-glue.c b/arch/arm/crypto/aes-neonbs-glue.c
index e6fd32919c81..98ca6e6cca90 100644
--- a/arch/arm/crypto/aes-neonbs-glue.c
+++ b/arch/arm/crypto/aes-neonbs-glue.c
@@ -339,6 +339,9 @@ static int __xts_crypt(struct skcipher_request *req, bool encrypt,
 	struct skcipher_walk walk;
 	int err;
 
+	if (!req->cryptlen)
+		return 0;
+
 	if (req->cryptlen < AES_BLOCK_SIZE)
 		return -EINVAL;
 
-- 
2.17.1