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.
RIOT-OS · Nov 10, 2014 · 365bfd8 · 365bfd8
1 parent b96b995
commit 365bfd8
Showing 1 changed file with 3 additions and 1 deletion.
diff --git 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);
 }