[PATCH 04/22] crypto: arm64/aes-neonbs - 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: Catalin Marinas <catalin.marinas at arm.com>
Cc: Will Deacon <will at kernel.org>
Signed-off-by: Andrei Botila <andrei.botila at nxp.com>
---
 arch/arm64/crypto/aes-neonbs-glue.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm64/crypto/aes-neonbs-glue.c b/arch/arm64/crypto/aes-neonbs-glue.c
index fb507d569922..197bf24e7dae 100644
--- a/arch/arm64/crypto/aes-neonbs-glue.c
+++ b/arch/arm64/crypto/aes-neonbs-glue.c
@@ -330,6 +330,9 @@ static int __xts_crypt(struct skcipher_request *req, bool encrypt,
 	int first = 1;
 	u8 *out, *in;
 
+	if (!req->cryptlen)
+		return 0;
+
 	if (req->cryptlen < AES_BLOCK_SIZE)
 		return -EINVAL;
 
-- 
2.17.1