From f16da520029e080562f839d2666c0f9774fdf90c Mon Sep 17 00:00:00 2001
From: Go Compiler Team <pkg-golang-devel@lists.alioth.debian.org>
Date: Fri, 20 Nov 2020 16:03:02 +0000
Subject: [PATCH] cve-2019-6486

Gbp-Pq: Name cve-2019-6486.patch
---
 src/crypto/elliptic/elliptic.go | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/crypto/elliptic/elliptic.go b/src/crypto/elliptic/elliptic.go
index c02df45..337adff 100644
--- a/src/crypto/elliptic/elliptic.go
+++ b/src/crypto/elliptic/elliptic.go
@@ -210,8 +210,9 @@ func (curve *CurveParams) doubleJacobian(x, y, z *big.Int) (*big.Int, *big.Int,
 
 	x3 := new(big.Int).Mul(alpha, alpha)
 	beta8 := new(big.Int).Lsh(beta, 3)
+	beta8.Mod(beta8, curve.P)
 	x3.Sub(x3, beta8)
-	for x3.Sign() == -1 {
+	if x3.Sign() == -1 {
 		x3.Add(x3, curve.P)
 	}
 	x3.Mod(x3, curve.P)
-- 
2.30.2