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

Commit Message

Andrei Botila Aug. 7, 2020, 4:20 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: "Breno Leitão" <[e-mail]>
Cc: Nayna Jain <[e-mail]>
Cc: Paulo Flabiano Smorigo <[e-mail]>
Cc: Benjamin Herrenschmidt <[e-mail]>
Cc: Paul Mackerras <[e-mail]>
Cc: Michael Ellerman <[e-mail]>
Signed-off-by: Andrei Botila <[e-mail]>
---
 drivers/crypto/vmx/aes_xts.c | 3 +++
 1 file changed, 3 insertions(+)

Patch

diff --git a/drivers/crypto/vmx/aes_xts.c b/drivers/crypto/vmx/aes_xts.c
index 9fee1b1532a4..33107c9e2656 100644
--- a/drivers/crypto/vmx/aes_xts.c
+++ b/drivers/crypto/vmx/aes_xts.c
@@ -84,6 +84,9 @@  static int p8_aes_xts_crypt(struct skcipher_request *req, int enc)
 	u8 tweak[AES_BLOCK_SIZE];
 	int ret;
 
+	if (!req->cryptlen)
+		return 0;
+
 	if (req->cryptlen < AES_BLOCK_SIZE)
 		return -EINVAL;