From: Bob Halley <halley@dnspython.org>
Date: Fri, 14 Aug 2020 20:27:08 +0000 (-0700)
Subject: Handle some invalid IPv6 literals we erroneously allowed.
X-Git-Tag: v2.1.0rc1~75
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f55f9ddeb82ddc7125d0347f438bfc13a1a6791f;p=thirdparty%2Fdnspython.git

Handle some invalid IPv6 literals we erroneously allowed.
---

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.