akr	2014-02-08 15:29:54 +0900 (Sat, 08 Feb 2014)

  New Revision: 44884

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=44884

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

  Modified files:
    trunk/ChangeLog
    trunk/lib/resolv.rb
Index: ChangeLog
===================================================================
--- ChangeLog	(revision 44883)
+++ ChangeLog	(revision 44884)
@@ -1,3 +1,9 @@ https://github.com/ruby/ruby/blob/trunk/ChangeLog#L1
+Sat Feb  8 15:27:02 2014  Tanaka Akira  <akr@f...>
+
+	* lib/resolv.rb (Resolv::DNS::Message::MessageDecoder): Raise
+	  DecodeError if no data before the limit.
+	  Reported by Will Bryant.  [ruby-core:60557] [Bug #9498]
+
 Sat Feb  8 15:11:21 2014  Tanaka Akira  <akr@f...>
 
 	* io.c (SMALLBUF): Unused macro removed.
Index: lib/resolv.rb
===================================================================
--- lib/resolv.rb	(revision 44883)
+++ lib/resolv.rb	(revision 44884)
@@ -1528,6 +1528,7 @@ class Resolv https://github.com/ruby/ruby/blob/trunk/lib/resolv.rb#L1528
         end
 
         def get_bytes(len = @limit - @index)
+          raise DecodeError.new("limit exceeded") if @limit < @index + len
           d = @data[@index, len]
           @index += len
           return d
@@ -1555,6 +1556,7 @@ class Resolv https://github.com/ruby/ruby/blob/trunk/lib/resolv.rb#L1556
         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]
@@ -1578,6 +1580,7 @@ class Resolv https://github.com/ruby/ruby/blob/trunk/lib/resolv.rb#L1580
           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

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