merge revision(s) 44884: [Backport ruby#9498]

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


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@45109 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

Author: nurse

ChangeLog

@@ -1,3 +1,9 @@
+Sat Feb 22 14:07:04 2014  Tanaka Akira  <[email protected]>
+
+	* 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 22 13:49:30 2014  Shugo Maeda  <[email protected]>
 
 	* vm_insnhelper.c (vm_call_method): should check ci->me->flag of

lib/resolv.rb

@@ -1520,6 +1520,7 @@ def get_length16
         end
 
         def get_bytes(len = @limit - @index)
+          raise DecodeError.new("limit exceeded") if @limit < @index + len
           d = @data[@index, len]
           @index += len
           return d
@@ -1547,6 +1548,7 @@ def get_unpack(template)
         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]
@@ -1570,6 +1572,7 @@ def get_labels(limit=nil)
           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

version.h

@@ -1,6 +1,6 @@
 #define RUBY_VERSION "2.1.1"
 #define RUBY_RELEASE_DATE "2014-02-22"
-#define RUBY_PATCHLEVEL 53
+#define RUBY_PATCHLEVEL 54
 
 #define RUBY_RELEASE_YEAR 2014
 #define RUBY_RELEASE_MONTH 2