From aad76acb6820173d6e053461cefcef0e21825932 Mon Sep 17 00:00:00 2001
From: sg <goldsimon@gmx.de>
Date: Wed, 26 Aug 2015 21:20:13 +0200
Subject: [PATCH] IPV6_REASS: fix ip6_reass_remove_oldest_datagram() when the
 first fragment to enqueue has more pbufs than IP_REASS_MAX_PBUFS

---
 src/core/ipv6/ip6_frag.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/core/ipv6/ip6_frag.c b/src/core/ipv6/ip6_frag.c
index 1e3ef586..8e0a4295 100644
--- a/src/core/ipv6/ip6_frag.c
+++ b/src/core/ipv6/ip6_frag.c
@@ -227,6 +227,10 @@ ip6_reass_remove_oldest_datagram(struct ip6_reassdata *ipr, int pbufs_needed)
       }
       r = r->next;
     }
+    if (oldest == ipr) {
+      /* nothing to free, ipr is the only element on the list */
+      return;
+    }
     if (oldest != NULL) {
       ip6_reass_free_complete_datagram(oldest);
     }