From f55f9ddeb82ddc7125d0347f438bfc13a1a6791f Mon Sep 17 00:00:00 2001
From: Bob Halley <halley@dnspython.org>
Date: Fri, 14 Aug 2020 13:27:08 -0700
Subject: [PATCH] Handle some invalid IPv6 literals we erroneously allowed.

---
 dns/ipv6.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/dns/ipv6.py b/dns/ipv6.py
index 0905aaf1..faadb7c2 100644
--- a/dns/ipv6.py
+++ b/dns/ipv6.py
@@ -121,7 +121,11 @@ def inet_aton(text, ignore_scope=False):
         elif l > 2:
             raise dns.exception.SyntaxError
 
-    if text == b'::':
+    if text == b'':
+        raise dns.exception.SyntaxError
+    elif text.endswith(b':') and not text.endswith(b'::'):
+        raise dns.exception.SyntaxError
+    elif text == b'::':
         text = b'0::'
     #
     # Get rid of the icky dot-quad syntax if we have it.
-- 
2.47.3