From c7a392d351feb64e9032aa9fe43a5e582736df7e Mon Sep 17 00:00:00 2001
From: John Safranek <john@wolfssl.com>
Date: Tue, 26 Jan 2021 17:36:15 -0800
Subject: [PATCH] if a handshake info has a stored kex init message already
 before trying to store a kex init message, free it

---
 src/internal.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/internal.c b/src/internal.c
index 0e67975..4bc7d6a 100644
--- a/src/internal.c
+++ b/src/internal.c
@@ -6352,6 +6352,12 @@ int SendKexInit(WOLFSSH* ssh)
 
         ssh->outputBuffer.length = idx;
 
+        if (ssh->handshake->kexInit != NULL) {
+            WFREE(ssh->handshake->kexInit, ssh->ctx->heap, DYNTYPE_STRING);
+            ssh->handshake->kexInit = NULL;
+            ssh->handshake->kexInitSz = 0;
+        }
+
         buf = (byte*)WMALLOC(bufSz, ssh->ctx->heap, DYNTYPE_STRING);
         if (buf == NULL) {
             WLOG(WS_LOG_DEBUG, "Cannot allocate storage for KEX Init msg");