Do not add items with offsets >= 2^14 to the compression table

2 files changed, 7 insertions, 1 deletions

diff --git a/ChangeLog b/ChangeLog
index ef4ab5f..2db5b02 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2013-04-28  Bob Halley  <halley@dnspython.org>
+
+	* dns/name.py (Name.to_wire): Do not add items with offsets >= 2^14
+	  to the compression table.  Thanks to Casey Deccio for discovering
+	  this bug.
+
 2013-04-26  Bob Halley  <halley@dnspython.org>
 
 	* dns/ipv6.py (inet_ntoa): We now comply with RFC 5952 section
diff --git a/dns/name.py b/dns/name.py
index ed3ffee..293ab95 100644
--- a/dns/name.py
+++ b/dns/name.py
@@ -419,7 +419,7 @@ class Name(object):
             else:
                 if not compress is None and len(n) > 1:
                     pos = file.tell()
-                    if pos < 0xc000:
+                    if pos <= 0x3fff:
                         compress[n] = pos
                 l = len(label)
                 file.write(chr(l))