* ext/syck/rubyext.c (mktime_do): avoid buffer overrun, by

  silently ignoring lesser significant digits.  Required buffer
  length can be computable so you might at first think of
  allocating enough memory space on the fly using alloca().  That
  is a wrong idea because when using alloca there is always risk
  of integer overflow.  A function that accepts outer-process
  resources like this should not blindly trust its inputs.  In
  this particular case we just want to generate miliseconds
  resolution by strtod() so the string in question needs no more
  length than what we originally have.  Ignoring lesser
  significant digits should suffice I believe.




git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@31443 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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