From 111a49e77e4b05a21bb37942ea2cfc254daa8d92 Mon Sep 17 00:00:00 2001
From: Hiroshi SHIBATA <hsbt@ruby-lang.org>
Date: Tue, 8 Jul 2025 16:39:02 +0900
Subject: [PATCH] Bump up resolv-0.3.1 for Ruby 3.3

---
 lib/resolv.rb           | 8 ++++++--
 test/resolv/test_dns.rb | 7 +++++++
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/lib/resolv.rb b/lib/resolv.rb
index 57fd173750..0f08a0c456 100644
--- a/lib/resolv.rb
+++ b/lib/resolv.rb
@@ -37,7 +37,7 @@ end
 
 class Resolv
 
-  VERSION = "0.3.0"
+  VERSION = "0.3.1"
 
   ##
   # Looks up the first IP address for +name+.
@@ -1655,6 +1655,7 @@ class Resolv
           prev_index = @index
           save_index = nil
           d = []
+          size = -1
           while true
             raise DecodeError.new("limit exceeded") if @limit <= @index
             case @data.getbyte(@index)
@@ -1675,7 +1676,10 @@ class Resolv
               end
               @index = idx
             else
-              d << self.get_label
+              l = self.get_label
+              d << l
+              size += 1 + l.string.bytesize
+              raise DecodeError.new("name label data exceed 255 octets") if size > 255
             end
           end
         end
diff --git a/test/resolv/test_dns.rb b/test/resolv/test_dns.rb
index 20c3408cd6..c25026eb4c 100644
--- a/test/resolv/test_dns.rb
+++ b/test/resolv/test_dns.rb
@@ -589,6 +589,13 @@ class TestResolvDNS < Test::Unit::TestCase
     assert_operator(2**14, :<, m.to_s.length)
   end
 
+  def test_too_long_address
+    too_long_address_message = [0, 0, 1, 0, 0, 0].pack("n*") + "\x01x" * 129 + [0, 0, 0].pack("cnn")
+    assert_raise_with_message(Resolv::DNS::DecodeError, /name label data exceed 255 octets/) do
+      Resolv::DNS::Message.decode too_long_address_message
+    end
+  end
+
   def assert_no_fd_leak
     socket = assert_throw(self) do |tag|
       Resolv::DNS.stub(:bind_random_port, ->(s, *) {throw(tag, s)}) do