[pull] master from ruby:master - #1433
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The conversion of the pattern to string can cause the string to be modified.
This can cause a buffer overflow since it uses the original length of the
string. For example, the following script reports a buffer overflow with
ASAN:
s = "héllo" * 1000
obj = Object.new
obj.define_singleton_method(:to_str) do
s.replace("hé")
"l"
end
p s.rpartition(obj)
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