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Subject[PATCH 15/22] crypto: ccp - add check for xts input length equal to zero
Date
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: Tom Lendacky <thomas.lendacky@amd.com>
Cc: John Allen <john.allen@amd.com>
Signed-off-by: Andrei Botila <andrei.botila@nxp.com>
---
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
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