From 9c0329c72b96af50a4bd8e971a31726346835d2d Mon Sep 17 00:00:00 2001
From: warrows <warrows@gamer666.fr>
Date: Sun, 19 May 2019 19:09:30 +0200
Subject: [PATCH] [zerocoin] Free memory from ToString()

Simple fix for a minor memory leak
---
 src/libzerocoin/bignum_gmp.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/libzerocoin/bignum_gmp.cpp b/src/libzerocoin/bignum_gmp.cpp
index 58b7580f3b5bd..0d9ac4c4385da 100644
--- a/src/libzerocoin/bignum_gmp.cpp
+++ b/src/libzerocoin/bignum_gmp.cpp
@@ -196,6 +196,11 @@ std::string CBigNum::ToString(int nBase) const
 {
     char* c_str = mpz_get_str(NULL, nBase, bn);
     std::string str(c_str);
+    // Free c_str with the right free function:
+    void (*freefunc)(void *, size_t);
+    mp_get_memory_functions (NULL, NULL, &freefunc);
+    freefunc(c_str, strlen(c_str) + 1);
+
     return str;
 }