From c31fdda2c7074db44c6c85841f1f8f430d1e4f7c Mon Sep 17 00:00:00 2001
From: Mark Hale <mark.hale@physics.org>
Date: Wed, 3 Jun 2020 12:33:51 +0100
Subject: [PATCH] Fix to allow more than one certificate to be loaded
 (espressif#3248).

---
 libraries/WiFiClientSecure/src/WiFiClientSecure.cpp | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/libraries/WiFiClientSecure/src/WiFiClientSecure.cpp b/libraries/WiFiClientSecure/src/WiFiClientSecure.cpp
index 3f545c6723c..5402fd503e5 100644
--- a/libraries/WiFiClientSecure/src/WiFiClientSecure.cpp
+++ b/libraries/WiFiClientSecure/src/WiFiClientSecure.cpp
@@ -274,18 +274,16 @@ bool WiFiClientSecure::verify(const char* fp, const char* domain_name)
 }
 
 char *WiFiClientSecure::_streamLoad(Stream& stream, size_t size) {
-  static char *dest = nullptr;
-  if(dest) {
-      free(dest);
-  }
-  dest = (char*)malloc(size);
+  char *dest = (char*)malloc(size+1);
   if (!dest) {
     return nullptr;
   }
   if (size != stream.readBytes(dest, size)) {
     free(dest);
     dest = nullptr;
+    return nullptr;
   }
+  dest[size] = '\0';
   return dest;
 }