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

[ Upstream commit 8a4e047c6cc07676f637608a9dd675349b5de0a7 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/crypto/marvell/cesa/cipher.c b/drivers/crypto/marvell/cesa/cipher.c
index 8dc10f99889481d03ab9511b47da6961eb19e3c0..051a661a63eeb65621d19bfa9950e933a3c927d8 100644 (file)
--- a/drivers/crypto/marvell/cesa/cipher.c
+++ b/drivers/crypto/marvell/cesa/cipher.c
@@ -449,6 +449,9 @@ 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;