[PATCH v11 1/4] crypto: qce - Reject empty messages for AES-XTS

[Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>]

XTS is not defined for an empty plaintext: it requires at least one full
block of data. The driver treated a zero-length request as a successful
no-op, so the crypto self-tests "unexpectedly succeeded" when -EINVAL
was expected.

Return -EINVAL for empty XTS requests while keeping the no-op behavior
for the other ciphers, which the crypto engine simply cannot process due
to its DMA not supporting zero-length transfers.

Cc: stable@vger.kernel.org
Fixes: f08789462255 ("crypto: qce - Return error for zero length messages")
Tested-by: Kuldeep Singh <kuldeep.singh@oss.qualcomm.com>
Tested-by: Pankaj Patil <pankaj.patil@oss.qualcomm.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
---
 drivers/crypto/qce/skcipher.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/qce/skcipher.c b/drivers/crypto/qce/skcipher.c
index 03a3cec2bb90e8d8c17e491ca40ec740a003d1b4..f177062eb735148561f798d0d3e65265f3235da8 100644
--- a/drivers/crypto/qce/skcipher.c
+++ b/drivers/crypto/qce/skcipher.c
@@ -222,8 +222,12 @@ static int qce_skcipher_crypt(struct skcipher_request *req, int encrypt)
 	keylen = IS_XTS(rctx->flags) ? ctx->enc_keylen >> 1 : ctx->enc_keylen;
 
 	/* CE does not handle 0 length messages */
-	if (!req->cryptlen)
+	if (!req->cryptlen) {
+		/* XTS requires at least one full block of data */
+		if (IS_XTS(rctx->flags))
+			return -EINVAL;
 		return 0;
+	}
 
 	/*
 	 * ECB and CBC algorithms require message lengths to be

-- 
2.47.3