From a1cdd1d02495657a47d442d0235a10987f9dc752 Mon Sep 17 00:00:00 2001
From: QiaoChong <qiaochong@loongson.cn>
Date: Sat, 25 May 2019 20:28:32 +0800
Subject: [PATCH] free allow null ptr.

Change-Id: Id1221defb7400f49c1e1ba8b6fdf6fe142370fbe
Signed-off-by: QiaoChong <qiaochong@loongson.cn>
---
 lib/libc/malloc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/libc/malloc.c b/lib/libc/malloc.c
index cd928e9c..df664409 100644
--- a/lib/libc/malloc.c
+++ b/lib/libc/malloc.c
@@ -112,6 +112,7 @@ void
 free(void *ap)
 {
 	HEADER *p, *q;
+	if (!ap) return;
 
 	p = (HEADER *) ap - 1;
 	if (p->s.ptr != p)