[PATCH 15/22] crypto: ccp - add check for xts input length equal to zero

[Andrei Botila]

From: Andrei Botila <andrei.botila@xxxxxxx>

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@xxxxxxx>
Cc: John Allen <john.allen@xxxxxxx>
Signed-off-by: Andrei Botila <andrei.botila@xxxxxxx>
---
 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