From 3615592e82a1083dbe8c65ac4154369f0aff473e Mon Sep 17 00:00:00 2001
From: ligd <liguiding1@xiaomi.com>
Date: Tue, 26 Oct 2021 16:10:39 +0800
Subject: [PATCH] mm: fix realloc overwrite memcpy when use a new block

Signed-off-by: ligd <liguiding1@xiaomi.com>
---
 mm/mm_heap/mm_realloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/mm_heap/mm_realloc.c b/mm/mm_heap/mm_realloc.c
index 093446efa1..bfaf2e6b46 100644
--- a/mm/mm_heap/mm_realloc.c
+++ b/mm/mm_heap/mm_realloc.c
@@ -355,7 +355,7 @@ FAR void *mm_realloc(FAR struct mm_heap_s *heap, FAR void *oldmem,
       newmem = (FAR void *)mm_malloc(heap, size);
       if (newmem)
         {
-          memcpy(newmem, oldmem, oldsize);
+          memcpy(newmem, oldmem, oldsize - SIZEOF_MM_ALLOCNODE);
           mm_free(heap, oldmem);
         }