From: "fotos (Fotos Georgiadis)" <gfotos@...>
Date: 2013-07-11T23:08:17+09:00
Subject: [ruby-core:55950] [ruby-trunk - Bug #8612] nil in ERB::Util.url_encode


Issue #8612 has been updated by fotos (Fotos Georgiadis).

File ruby_1_9_3_cgi_escape_issue.patch added
File ruby_2_0_0_cgi_escape_issue.patch added

=begin
The same issue exists in (({CGI::escape})). Internally it calls (({$1.bytesize})) and (({$1})) is (({nil})).

For example calling:

  CGI::escape(ActiveSupport::SafeBuffer.new('��'))

results in:

  NoMethodError: undefined method `bytesize' for nil:NilClass
  from ruby-1.9.3-p194/lib/ruby/1.9.1/cgi/util.rb:8:in `block in escape'

I didn't test this with the latest stable versions of 1.9 or 2.0 but looking at the code it appears to be the same issue (global variables (({$1})), (({$2})), (({$`})), (({$&})), and (({$'})) appear to be (({nil}))). Yielding and using the match in gsub also solves the problem.

Thanks

=end

----------------------------------------
Bug #8612: nil in ERB::Util.url_encode
https://bugs.ruby-lang.org/issues/8612#change-40448

Author: fotos (Fotos Georgiadis)
Status: Assigned
Priority: Normal
Assignee: seki (Masatoshi Seki)
Category: lib
Target version: 
ruby -v: 1.9.3p448, 2.0.0p255
Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN


=begin
We hit a bug while using Rails and trying to URL encode an ActiveSupport::SafeBuffer. I have managed to reproduce it using a small test case for Ruby 1.9.3 and Ruby 2.0.0 (both attached) that shows a minimum set of requirements to trigger the bug. The issue seems to be fixed in trunk (2.1) but I couldn't find the relevant commit(s).

To reproduce:
  require 'erb'

  class MyString < String
    def to_s
      self
    end

    def gsub(*args, &block)
      to_str.gsub(*args, &block)
    end
  end

  string = "\xCE\x94\xCE\xBF\xCE\xBA\xCE\xB9\xCE\xBC\xCE\xAE".force_encoding("UTF-8")

  ERB::Util.u(MyString.new(string))

Expected outcome:

The URL encoding should work and it should encode the characters properly (according to the spec).

Actual outcome:

  NoMethodError: undefined method `unpack' for nil:NilClass
    /Users/fotos/Playground/OpenSource/ruby/lib/erb.rb:952:in `block in url_encode'
    /Users/fotos/Playground/OpenSource/ruby/test/erb/test_erb.rb:71:in `gsub'
    /Users/fotos/Playground/OpenSource/ruby/test/erb/test_erb.rb:71:in `gsub'
    /Users/fotos/Playground/OpenSource/ruby/lib/erb.rb:951:in `url_encode'
    /Users/fotos/Playground/OpenSource/ruby/test/erb/test_erb.rb:491:in `test_url_encode_string_subclass'

Using

Workaround:

Yielding the match and using it instead of $& (last match) seems to work properly as demonstrated in the patch.

Thanks

PS. Some credits go out to Aggelos Orfanakos (@agorf) for triggering the bug! :-)
=end


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