[PATCH 03/22] crypto: arm64/aes - 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: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Andrei Botila <andrei.botila@xxxxxxx>
---
 arch/arm64/crypto/aes-glue.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm64/crypto/aes-glue.c b/arch/arm64/crypto/aes-glue.c
index 395bbf64b2ab..44c9644c74b1 100644
--- a/arch/arm64/crypto/aes-glue.c
+++ b/arch/arm64/crypto/aes-glue.c
@@ -515,6 +515,9 @@ static int __maybe_unused 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;
 
@@ -587,6 +590,9 @@ static int __maybe_unused 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