[ruby-cvs:65331] nagachika:r58160 (ruby_2_3): merge revision(s) 58040, 58041: [Backport #13353]

[nagachika at ruby-lang.org]

nagachika	2017-03-28 00:35:54 +0900 (Tue, 28 Mar 2017)

  New Revision: 58160

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=58160

  Log:
    merge revision(s) 58040,58041: [Backport #13353]
    
    stringio.c: check character code
    
    * ext/stringio/stringio.c (strio_ungetc): check if the character
      code is valid in the encoding.  reported by Ahmad Sherif
      (ahmadsherif) at https://hackerone.com/reports/209593.
    stringio.c: check range
    
    * ext/stringio/stringio.c (strio_ungetc): raise RangeError instead
      of TypeError at too big value, as well as IO#ungetc.

  Modified directories:
    branches/ruby_2_3/
  Modified files:
    branches/ruby_2_3/ext/stringio/stringio.c
    branches/ruby_2_3/test/stringio/test_stringio.rb
    branches/ruby_2_3/version.h