crypto: sahara - handle zero-length aes requests

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>

diff --git a/drivers/crypto/sahara.c b/drivers/crypto/sahara.c
index 27ed66cb761fa688786175c6962dd6d016fe4e22..1f78dfe84c51b0b582d53a84b8437d8262f3915f 100644 (file)
--- a/drivers/crypto/sahara.c
+++ b/drivers/crypto/sahara.c
@@ -674,6 +674,9 @@ 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);