[PATCH] crypto: hisilicon/hpre - add check before gx modulo p

[Hui Tang]

The result of gx modulo p is zero if gx is equal to p, so return
error immediately if gx is equal to p.

Signed-off-by: Hui Tang <tanghui20@xxxxxxxxxx>
---
 drivers/crypto/hisilicon/hpre/hpre_crypto.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/hisilicon/hpre/hpre_crypto.c b/drivers/crypto/hisilicon/hpre/hpre_crypto.c
index 6ba5d8a..323418b 100644
--- a/drivers/crypto/hisilicon/hpre/hpre_crypto.c
+++ b/drivers/crypto/hisilicon/hpre/hpre_crypto.c
@@ -1841,8 +1841,12 @@ static int hpre_curve25519_src_init(struct hpre_asym_request *hpre_req,
 	 * When src_data equals (2^255 - 19) ~  (2^255 - 1), it is out of p,
 	 * we get its modulus to p, and then use it.
 	 */
-	if (memcmp(ptr, p, ctx->key_sz) >= 0)
+	if (memcmp(ptr, p, ctx->key_sz) == 0) {
+		dev_err(dev, "gx is p!\n");
+		return -EINVAL;
+	} else if (memcmp(ptr, p, ctx->key_sz) > 0) {
 		hpre_curve25519_src_modulo_p(ptr);
+	}
 
 	hpre_req->src = ptr;
 	msg->in = cpu_to_le64(dma);
-- 
2.8.1