From 365bfd81af50c4069b4eb5ba945eaaa0c4f879b2 Mon Sep 17 00:00:00 2001
From: Oleg Hahm <oleg@hobbykeller.org>
Date: Sat, 8 Nov 2014 20:06:03 +0100
Subject: [PATCH] IPv6: allow complete in ipv6_addr_init_prefix

If the specified prefix is a full IPv6 address, no bits remain.
Fixes a possible buffer overrun.
---
 sys/net/network_layer/sixlowpan/ip.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/sys/net/network_layer/sixlowpan/ip.c b/sys/net/network_layer/sixlowpan/ip.c
index 060b19462c..afb7920581 100644
--- a/sys/net/network_layer/sixlowpan/ip.c
+++ b/sys/net/network_layer/sixlowpan/ip.c
@@ -658,7 +658,9 @@ void ipv6_addr_init_prefix(ipv6_addr_t *out, const ipv6_addr_t *prefix,
     }
 
     memcpy(out, prefix, bytes);
-    out->uint8[bytes] = prefix->uint8[bytes] & mask;
+    if (bytes < 16) {
+        out->uint8[bytes] = prefix->uint8[bytes] & mask;
+    }
     memset(&(out[bytes + 1]), 0, 15 - bytes);
 }