[ruby/ipaddr] Fix exception calling `to_range' after `freeze'

https://github.com/ruby/ipaddr/commit/77fe1fca0a

1 files changed, 2 insertions, 1 deletions

diff --git a/lib/ipaddr.rb b/lib/ipaddr.rb
index 51ad081e23..c33302ce05 100644
--- a/lib/ipaddr.rb
+++ b/lib/ipaddr.rb
@@ -411,7 +411,7 @@ class IPAddr
       raise AddressFamilyError, "unsupported address family"
     end
 
-    return clone.set(begin_addr, @family)..clone.set(end_addr, @family)
+    self.class.new(begin_addr, @family)..self.class.new(end_addr, @family)
   end
 
   # Returns the prefix length in bits for the ipaddr.
@@ -583,6 +583,7 @@ class IPAddr
   # those, such as &, |, include? and ==, accept a string, or a packed
   # in_addr value instead of an IPAddr object.
   def initialize(addr = '::', family = Socket::AF_UNSPEC)
+    @mask_addr = nil
     if !addr.kind_of?(String)
       case family
       when Socket::AF_INET, Socket::AF_INET6