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merge revision(s) r44884: [Backport #9498]

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* lib/resolv.rb (Resolv::DNS::Message::MessageDecoder): Raise
	  DecodeError if no data before the limit.
	  Reported by Will Bryant.  [ruby-core:60557] [Bug #9498]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@44976 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nagachika 2014-02-15 14:59:17 +00:00
parent f9acab1f42
commit d9e36580ef
3 changed files with 10 additions and 1 deletions
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3
lib/resolv.rb
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@ -1489,6 +1489,7 @@ class Resolv
end
def get_bytes(len = @limit - @index)
raise DecodeError.new("limit exceeded") if @limit < @index + len
d = @data[@index, len]
@index += len
return d
@ -1516,6 +1517,7 @@ class Resolv
end
def get_string
raise DecodeError.new("limit exceeded") if @limit <= @index
len = @data[@index].ord
raise DecodeError.new("limit exceeded") if @limit < @index + 1 + len
d = @data[@index + 1, len]
@ -1539,6 +1541,7 @@ class Resolv
limit = @index if !limit || @index < limit
d = []
while true
raise DecodeError.new("limit exceeded") if @limit <= @index
case @data[@index].ord
when 0
@index += 1