From dd07c522c92dd54cba5f42382dc5b1756750da36 Mon Sep 17 00:00:00 2001
From: Russ Butler <russ.butler@arm.com>
Date: Mon, 29 Aug 2016 17:14:16 -0500
Subject: [PATCH] Fix double free in NanostackInterface

When freeing all memory in the rx buffer chain set the head pointer to
NULL. This prevents the head rx buffer from getting freed twice.
---
 .../net/FEATURE_IPV6/nanostack-interface/NanostackInterface.cpp  | 1 +
 1 file changed, 1 insertion(+)

diff --git a/features/net/FEATURE_IPV6/nanostack-interface/NanostackInterface.cpp b/features/net/FEATURE_IPV6/nanostack-interface/NanostackInterface.cpp
index 9cd5688c42..6571d7faba 100644
--- a/features/net/FEATURE_IPV6/nanostack-interface/NanostackInterface.cpp
+++ b/features/net/FEATURE_IPV6/nanostack-interface/NanostackInterface.cpp
@@ -368,6 +368,7 @@ void NanostackSocket::data_free_all(void)
     // No mode requirement
 
     NanostackBuffer *buffer = rxBufChain;
+    rxBufChain = NULL;
     while (buffer != NULL) {
         NanostackBuffer *next_buffer = buffer->next;
         FREE(buffer);