From ffdd44ec7480758d00e7539dcff14487f60c8183 Mon Sep 17 00:00:00 2001
From: Dirk Ziegelmeier <dirk@ziegelmeier.net>
Date: Wed, 4 Apr 2018 21:04:14 +0200
Subject: [PATCH] Fix bug #53559: IPv4 to IPv6 filtering not freeing PBUFs

Add missing pbuf_free() call
---
 src/core/ipv6/ip6.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/core/ipv6/ip6.c b/src/core/ipv6/ip6.c
index efbd4f7b..16f3eea6 100644
--- a/src/core/ipv6/ip6.c
+++ b/src/core/ipv6/ip6.c
@@ -574,6 +574,8 @@ ip6_input(struct pbuf *p, struct netif *inp)
   if (ip6_addr_isipv4mappedipv6(ip_2_ip6(&ip_data.current_iphdr_dest)) ||
      ip6_addr_isipv4mappedipv6(ip_2_ip6(&ip_data.current_iphdr_src)) ||
      ip6_addr_ismulticast(ip_2_ip6(&ip_data.current_iphdr_src))) {
+    /* free (drop) packet pbufs */
+    pbuf_free(p);
     IP6_STATS_INC(ip6.err);
     IP6_STATS_INC(ip6.drop);
     return ERR_OK;