https://git.ruby-lang.org/ruby.git/commit/?id=38da84296c

From 38da84296c0e50c4285d8a8c146af5fc3c8afc7d Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Tue, 7 May 2019 08:39:42 +0900
Subject: [ruby/ipaddr] Raise if extra slashes follow

https://bugs.ruby-lang.org/issues/15832

https://github.com/ruby/ipaddr/commit/de9805d6fa
---
 lib/ipaddr.rb       | 2 +-
 test/test_ipaddr.rb | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/ipaddr.rb b/lib/ipaddr.rb
index 26d1bd7409..6385d69c6a 100644
--- a/lib/ipaddr.rb
+++ b/lib/ipaddr.rb
@@ -566,7 +566,7 @@ class IPAddr https://github.com/ruby/ruby/blob/trunk/lib/ipaddr.rb#L566
         raise AddressFamilyError, "unsupported address family: #{family}"
       end
     end
-    prefix, prefixlen = addr.split('/')
+    prefix, prefixlen = addr.split('/', 2)
     if prefix =~ /\A\[(.*)\]\z/i
       prefix = $1
       family = Socket::AF_INET6
diff --git a/test/test_ipaddr.rb b/test/test_ipaddr.rb
index e2243dc542..3c3d70e3f2 100644
--- a/test/test_ipaddr.rb
+++ b/test/test_ipaddr.rb
@@ -91,6 +91,7 @@ class TC_IPAddr < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/test_ipaddr.rb#L91
     assert_raise(IPAddr::InvalidAddressError) { IPAddr.new("[192.168.1.2]/120") }
     assert_raise(IPAddr::InvalidAddressError) { IPAddr.new("[2001:200:300::]\nINVALID") }
     assert_raise(IPAddr::InvalidAddressError) { IPAddr.new("192.168.0.1/32\nINVALID") }
+    assert_raise(IPAddr::InvalidAddressError) { IPAddr.new("192.168.0.1/32/20") }
     assert_raise(IPAddr::InvalidPrefixError) { IPAddr.new("::1/255.255.255.0") }
     assert_raise(IPAddr::InvalidPrefixError) { IPAddr.new("::1/129") }
     assert_raise(IPAddr::InvalidPrefixError) { IPAddr.new("192.168.0.1/33") }
-- 
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