From 3768f8aeef9faa009a2c056beacaa566bd90013e Mon Sep 17 00:00:00 2001
From: Zenju <zenju@gmx.de>
Date: Fri, 11 Sep 2015 15:45:00 +0200
Subject: [PATCH] kex: free server host key before allocating it (again)

Fixes a memory leak when Synology server requests key exchange

Closes #43
---
 src/kex.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/kex.c b/src/kex.c
index 08faf72..1fdd626 100644
--- a/src/kex.c
+++ b/src/kex.c
@@ -202,6 +202,10 @@ static int diffie_hellman_sha1(LIBSSH2_SESSION *session,
 
         session->server_hostkey_len = _libssh2_ntohu32(exchange_state->s);
         exchange_state->s += 4;
+
+        if (session->server_hostkey)
+            LIBSSH2_FREE(session, session->server_hostkey);
+
         session->server_hostkey =
             LIBSSH2_ALLOC(session, session->server_hostkey_len);
         if (!session->server_hostkey) {