[PATCH v4 06/11] crypto: qce: skcipher: Return error for non-blocksize data(ECB/CBC algorithms)

[Thara Gopinath]

ECB/CBC encryption/decryption requires the data to be blocksize aligned.
Crypto engine hangs on non-block sized operations for these algorithms.
Return invalid data if data size is not blocksize aligned for these
algorithms.

Signed-off-by: Thara Gopinath <thara.gopin...@linaro.org>
---
 drivers/crypto/qce/skcipher.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/crypto/qce/skcipher.c b/drivers/crypto/qce/skcipher.c
index 331b3c3a5b59..28bea9584c33 100644
--- a/drivers/crypto/qce/skcipher.c
+++ b/drivers/crypto/qce/skcipher.c
@@ -254,6 +254,7 @@ static int qce_skcipher_crypt(struct skcipher_request *req, 
int encrypt)
        struct qce_cipher_ctx *ctx = crypto_skcipher_ctx(tfm);
        struct qce_cipher_reqctx *rctx = skcipher_request_ctx(req);
        struct qce_alg_template *tmpl = to_cipher_tmpl(tfm);
+       unsigned int blocksize = crypto_skcipher_blocksize(tfm);
        int keylen;
        int ret;
 
@@ -265,6 +266,17 @@ static int qce_skcipher_crypt(struct skcipher_request 
*req, int encrypt)
        if (!req->cryptlen)
                return -EOPNOTSUPP;
 
+       /*
+        * ECB and CBC algorithms require message lengths to be
+        * multiples of block size.
+        * TODO: The spec says AES CBC mode for certain versions
+        * of crypto engine can handle partial blocks as well.
+        * Test and enable such messages.
+        */
+       if (IS_ECB(rctx->flags) || IS_CBC(rctx->flags))
+               if (!IS_ALIGNED(req->cryptlen, blocksize))
+                       return -EINVAL;
+
        /* qce is hanging when AES-XTS request len > QCE_SECTOR_SIZE and
         * is not a multiple of it; pass such requests to the fallback
         */
-- 
2.25.1