From 99cc9fd6d01db1165d08b88d45c0de85a59b70cf Mon Sep 17 00:00:00 2001
From: Tim Ruffing <crypto@timruffing.de>
Date: Sat, 8 Jun 2019 13:21:52 +0200
Subject: [PATCH] Don't rely on memset to set signed integers to 0

---
 src/ecmult_impl.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/ecmult_impl.h b/src/ecmult_impl.h
index 8f58455209..0b53b3fcb9 100644
--- a/src/ecmult_impl.h
+++ b/src/ecmult_impl.h
@@ -171,7 +171,9 @@ static int secp256k1_ecmult_wnaf(int *wnaf, int len, const secp256k1_scalar *a,
     VERIFY_CHECK(a != NULL);
     VERIFY_CHECK(2 <= w && w <= 31);
 
-    memset(wnaf, 0, len * sizeof(wnaf[0]));
+    for (bit = 0; bit < len; bit++) {
+        wnaf[bit] = 0;
+    }
 
     s = *a;
     if (secp256k1_scalar_get_bits_limb32(&s, 255, 1)) {
@@ -179,6 +181,7 @@ static int secp256k1_ecmult_wnaf(int *wnaf, int len, const secp256k1_scalar *a,
         sign = -1;
     }
 
+    bit = 0;
     while (bit < len) {
         int now;
         int word;