From 08503a20be606968ef116b1b95f9c24a05762cb0 Mon Sep 17 00:00:00 2001
From: rajithr <r.rajith@gmail.com>
Date: Wed, 27 May 2015 19:06:19 +0530
Subject: [PATCH] Protection against possible buffer overflow

---
 core/net/packetbuf.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/core/net/packetbuf.c b/core/net/packetbuf.c
index 217f40bc2..20bfebe80 100644
--- a/core/net/packetbuf.c
+++ b/core/net/packetbuf.c
@@ -141,6 +141,7 @@ packetbuf_copyto(void *to)
     int i;
     char buffer[1000];
     char *bufferptr = buffer;
+    int  bufferlen = 0;
     
     bufferptr[0] = 0;
     for(i = hdrptr; i < PACKETBUF_HDR_SIZE; ++i) {
@@ -149,8 +150,8 @@ packetbuf_copyto(void *to)
     PRINTF("packetbuf_write: header: %s\n", buffer);
     bufferptr = buffer;
     bufferptr[0] = 0;
-    for(i = bufptr; i < buflen + bufptr; ++i) {
-      bufferptr += sprintf(bufferptr, "0x%02x, ", packetbufptr[i]);
+    for(i = bufptr; ((i < buflen + bufptr) && (bufferlen < 980)); ++i) {
+      bufferlen += sprintf(bufferptr + bufferlen, "0x%02x, ", packetbufptr[i]);
     }
     PRINTF("packetbuf_write: data: %s\n", buffer);
   }