crypto: sahara - handle zero-length aes requests

[ Upstream commit d1d6351e37aac14b32a291731d0855996c459d11 ]

In case of a zero-length input, exit gracefully from sahara_aes_crypt().

Fixes: 5de8875281e1 ("crypto: sahara - Add driver for SAHARA2 accelerator.")
Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/crypto/sahara.c b/drivers/crypto/sahara.c
index bbd2c6474b50305a68ccc2e1623a8fbfe7612065..3229dd180d0c1cc61e73e9847e9e43db97357ec3 100644 (file)
--- a/drivers/crypto/sahara.c
+++ b/drivers/crypto/sahara.c
@@ -677,6 +677,9 @@ static int sahara_aes_crypt(struct skcipher_request *req, unsigned long mode)
        struct sahara_dev *dev = dev_ptr;
        int err = 0;
 
+       if (!req->cryptlen)
+               return 0;
+
        if (unlikely(ctx->keylen != AES_KEYSIZE_128))
                return sahara_aes_fallback(req, mode);