From 8a74bb5c7becbd7492f4445b852602c3e88ba143 Mon Sep 17 00:00:00 2001
From: Bernd Edlinger <bernd.edlinger@hotmail.de>
Date: Sun, 17 Mar 2019 17:28:24 +0100
Subject: [PATCH] Clear the point S before freeing in ec_scalar_mul_ladder
The secret point R can be recovered from S using the equation R = S - P.
The X and Z coordinates should be sufficient for that.
Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/8504)
---
crypto/ec/ec_mult.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/crypto/ec/ec_mult.c b/crypto/ec/ec_mult.c
index 9b0aac2313..c76c528048 100644
--- a/crypto/ec/ec_mult.c
+++ b/crypto/ec/ec_mult.c
@@ -378,7 +378,7 @@ int ec_scalar_mul_ladder(const EC_GROUP *group, EC_POINT *r,
err:
EC_POINT_free(p);
- EC_POINT_free(s);
+ EC_POINT_clear_free(s);
BN_CTX_end(ctx);
return ret;
--
2.25.1