From f3ea226d91588016ee8b5ecef8d75c6869a615ed Mon Sep 17 00:00:00 2001
From: Tomoki Shirasawa <sira@popeye.cc.u-tokyo.ac.jp>
Date: Wed, 1 Oct 2014 09:04:11 +0900
Subject: [PATCH] fix strncpy buffer overrun

---
 lib/string.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/string.c b/lib/string.c
index 1efac9ee..624e390a 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -50,9 +50,11 @@ char *strncpy(char *dest, const char *src, size_t maxlen)
 	char *head = dest;
 	ssize_t len = maxlen;
 
+	if(len <= 0)
+		return head;
 	while((*(dest++) = *(src++)) && --len);
 	if(len > 0){
-		while(len--){
+		while(--len){
 			*(dest++) = '\0';
 		}
 	}