linux-kernel - [PATCH 7/8] Replace memset() with memzero

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Message-ID: <CACXcFmm=eUjfVAJGgFGPfHWCc7s37j0==eASdqJK3OBAazeyOQ@mail.gmail.com>
Date:   Tue, 16 Nov 2021 19:38:06 +0800
From:   Sandy Harris <sandyinchina@...il.com>
To:     LKML <linux-kernel@...r.kernel.org>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH 7/8] Replace memset() with memzero_explicit()

Replace memset(address,0,bytes) which may be optimised
away with memzero_explicit(address,bytes) which resists
such optimisation

---
 crypto/sm2.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crypto/sm2.c b/crypto/sm2.c
index db8a4a265669..58641d964671 100644
--- a/crypto/sm2.c
+++ b/crypto/sm2.c
@@ -124,7 +124,7 @@ static void sm2_ec_ctx_deinit(struct mpi_ec_ctx *ec)
 {
     mpi_ec_deinit(ec);

-    memset(ec, 0, sizeof(*ec));
+    memzero_explicit(ec, sizeof(*ec));
 }

 /* RESULT must have been initialized and is set on success to the
--