From 9e324032b6ddaa25086af371a43d80eea3aa23fe Mon Sep 17 00:00:00 2001
From: "bernard.xiong" <bernard.xiong@gmail.com>
Date: Thu, 14 Oct 2010 09:38:03 +0000
Subject: [PATCH] fix rt_realloc issue when realloc a NULL pointer.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1010 bbd45198-f89e-11dd-88c7-29a3b14d5316
---
 src/mem.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/mem.c b/src/mem.c
index 22921253ea..5bfc7b7d04 100644
--- a/src/mem.c
+++ b/src/mem.c
@@ -13,6 +13,7 @@
  * 2010-06-09     Bernard      fix the end stub of heap
  *                             fix memory check in rt_realloc function
  * 2010-07-13     Bernard      fix RT_ALIGN issue found by kuronca
+ * 2010-10-14     Bernard      fix rt_realloc issue when realloc a NULL pointer.
  */
 
 /*
@@ -367,6 +368,10 @@ void *rt_realloc(void *rmem, rt_size_t newsize)
 		return RT_NULL;
 	}
 
+	/* allocate a new memory block */
+	if (rmem == RT_NULL)
+		return rt_malloc(newsize);
+
 	rt_sem_take(&heap_sem, RT_WAITING_FOREVER);
 
 	if ((rt_uint8_t *)rmem < (rt_uint8_t *)heap_ptr ||
-- 
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