From 8849a443a4116025fb8b88abeae4a417532606c6 Mon Sep 17 00:00:00 2001
From: goldsimon <goldsimon@gmx.de>
Date: Thu, 23 Feb 2017 20:16:51 +0100
Subject: [PATCH] pbuf_ref: assert-check for 'ref' overflow

(cherry picked from commit 76763c9bcd778bf67dc959e2992769c07ed0bdbe)
---
 src/core/pbuf.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/core/pbuf.c b/src/core/pbuf.c
index 4ca95b9a..059f83a5 100644
--- a/src/core/pbuf.c
+++ b/src/core/pbuf.c
@@ -822,6 +822,7 @@ pbuf_ref(struct pbuf *p)
   /* pbuf given? */
   if (p != NULL) {
     SYS_ARCH_INC(p->ref, 1);
+    LWIP_ASSERT("pbuf ref overflow", p->ref > 0);
   }
 }