From 0dcc99022cb67c63a55f4f5b9159881a7e414299 Mon Sep 17 00:00:00 2001
From: David Gauchard <gauchard@laas.fr>
Date: Wed, 13 Dec 2017 10:30:50 +0100
Subject: [PATCH] realloc bug: fix #3953 fix #3699

---
 cores/esp8266/umm_malloc/umm_malloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cores/esp8266/umm_malloc/umm_malloc.c b/cores/esp8266/umm_malloc/umm_malloc.c
index 9a06332c39..030042a1fc 100644
--- a/cores/esp8266/umm_malloc/umm_malloc.c
+++ b/cores/esp8266/umm_malloc/umm_malloc.c
@@ -1632,9 +1632,9 @@ static void *_umm_realloc( void *ptr, size_t size ) {
 
     if( (ptr = _umm_malloc( size )) ) {
       memcpy( ptr, oldptr, curSize );
+      _umm_free( oldptr );
     }
 
-    _umm_free( oldptr );
   }
 
   /* Release the critical section... */