crypto: marvell/cesa - Handle zero-length skcipher requests

Do not access random memory for zero-length skcipher requests.
Just return 0.

Fixes: f63601fd616a ("crypto: marvell/cesa - add a new driver for Marvell's CESA")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/crypto/marvell/cesa/cipher.c b/drivers/crypto/marvell/cesa/cipher.c
index cf62db50f9585814c128c658bf3a368e59ae57fc..48c5c8ea8c43ec00f255edee9dcb724b3958bbed 100644 (file)
--- a/drivers/crypto/marvell/cesa/cipher.c
+++ b/drivers/crypto/marvell/cesa/cipher.c
@@ -459,6 +459,9 @@ static int mv_cesa_skcipher_queue_req(struct skcipher_request *req,
        struct mv_cesa_skcipher_req *creq = skcipher_request_ctx(req);
        struct mv_cesa_engine *engine;
 
+       if (!req->cryptlen)
+               return 0;
+
        ret = mv_cesa_skcipher_req_init(req, tmpl);
        if (ret)
                return ret;