[ruby-cvs:64380] usa:r57214 (ruby_2_2): merge revision(s) 56938: [Backport #12988]

usa at ruby-lang.org usa at ruby-lang.org
Tue Dec 27 19:35:50 JST 2016


usa	2016-12-27 19:35:50 +0900 (Tue, 27 Dec 2016)

  New Revision: 57214

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=57214

  Log:
    merge revision(s) 56938: [Backport #12988]
    
    Stop reading past the end of `ivptr` array
    
    If you have code like this:
    
    ```ruby
    class A
      def initialize
        @a = nil
        @b = nil
        @c = nil
        @d = nil
        @e = nil
      end
    end
    
    x = A.new
    y = x.clone
    100.times { |z| x.instance_variable_set(:"@foo#{z}", nil) }
    puts y.inspect
    ```
    
    `x` and `y` will share `iv_index_tbl` hashes.  However, the size of the
    hash will grow larger than the number if entries in `ivptr` in `y`.
    Before this commit, `rb_ivar_count` would use the size of the hash to
    determine how far to read in to the array, but this means that it could
    read past the end of the array and cause the program to segv
    
    [ruby-core:78403]

  Modified directories:
    branches/ruby_2_2/
  Modified files:
    branches/ruby_2_2/ChangeLog
    branches/ruby_2_2/variable.c
    branches/ruby_2_2/version.h


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