[05/22] crypto: powerpc/aes-spe - add check for xts input length equal to zero

Commit Message

Andrei Botila Aug. 7, 2020, 4:19 p.m. UTC

From: Andrei Botila <[e-mail]>

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: Benjamin Herrenschmidt <[e-mail]>
Cc: Paul Mackerras <[e-mail]>
Cc: Michael Ellerman <[e-mail]>
Signed-off-by: Andrei Botila <[e-mail]>
---
 arch/powerpc/crypto/aes-spe-glue.c | 6 ++++++
 1 file changed, 6 insertions(+)

Patch

diff --git a/arch/powerpc/crypto/aes-spe-glue.c b/arch/powerpc/crypto/aes-spe-glue.c
index c2b23b69d7b1..f37d8bef322b 100644
--- a/arch/powerpc/crypto/aes-spe-glue.c
+++ b/arch/powerpc/crypto/aes-spe-glue.c
@@ -327,6 +327,9 @@  static int ppc_xts_encrypt(struct skcipher_request *req)
 	u8 b[2][AES_BLOCK_SIZE];
 	int err;
 
+	if (!req->cryptlen)
+		return 0;
+
 	if (req->cryptlen < AES_BLOCK_SIZE)
 		return -EINVAL;
 
@@ -366,6 +369,9 @@  static int ppc_xts_decrypt(struct skcipher_request *req)
 	le128 twk;
 	int err;
 
+	if (!req->cryptlen)
+		return 0;
+
 	if (req->cryptlen < AES_BLOCK_SIZE)
 		return -EINVAL;