From 7a31bf07493d365f5b44581dc4aaf3c9d48179f0 Mon Sep 17 00:00:00 2001
From: daurnimator <quae@daurnimator.com>
Date: Sun, 3 Jan 2016 11:35:43 +1100
Subject: bignum: bugfix: unm shouldn't modify it's operands

---
 src/openssl.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/openssl.c b/src/openssl.c
index e146098..a73917a 100644
--- a/src/openssl.c
+++ b/src/openssl.c
@@ -1924,8 +1924,9 @@ static int bn__shr(lua_State *L) {
 
 static int bn__unm(lua_State *L) {
 	BIGNUM *a = checksimple(L, 1, BIGNUM_CLASS);
+	BIGNUM *r = bn_dup(L, a);
 
-	BN_set_negative(a, !BN_is_negative(a));
+	BN_set_negative(r, !BN_is_negative(a));
 
 	return 1;
 } /* bn__unm() */
-- 
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