[PATCH 01/22] crypto: arm/aes-ce - add check for xts input length equal to zero

[Andrei Botila]

From: Andrei Botila <andrei.botila at 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: Russell King <linux at armlinux.org.uk>
Signed-off-by: Andrei Botila <andrei.botila at nxp.com>
---
 arch/arm/crypto/aes-ce-glue.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm/crypto/aes-ce-glue.c b/arch/arm/crypto/aes-ce-glue.c
index b668c97663ec..57a9cf7fe98a 100644
--- a/arch/arm/crypto/aes-ce-glue.c
+++ b/arch/arm/crypto/aes-ce-glue.c
@@ -452,6 +452,9 @@ static int xts_encrypt(struct skcipher_request *req)
 	struct scatterlist *src, *dst;
 	struct skcipher_walk walk;
 
+	if (!req->cryptlen)
+		return 0;
+
 	if (req->cryptlen < AES_BLOCK_SIZE)
 		return -EINVAL;
 
@@ -524,6 +527,9 @@ static int xts_decrypt(struct skcipher_request *req)
 	struct scatterlist *src, *dst;
 	struct skcipher_walk walk;
 
+	if (!req->cryptlen)
+		return 0;
+
 	if (req->cryptlen < AES_BLOCK_SIZE)
 		return -EINVAL;
 
-- 
2.17.1