* Strip nils from collections on JSON and XML posts. [CVE-2013-0155] * dealing with empty hashes. Thanks Damien Mathieu

Conflicts:
	actionpack/CHANGELOG.md
	actionpack/lib/action_dispatch/http/request.rb
	actionpack/lib/action_dispatch/middleware/params_parser.rb
	activerecord/CHANGELOG.md
	activerecord/lib/active_record/relation/predicate_builder.rb
	activerecord/test/cases/relation/where_test.rb

2 files changed, 6 insertions, 5 deletions

diff --git a/actionpack/lib/action_dispatch/http/request.rb b/actionpack/lib/action_dispatch/http/request.rb
index 452809a689..31b36eedb0 100644
--- a/actionpack/lib/action_dispatch/http/request.rb
+++ b/actionpack/lib/action_dispatch/http/request.rb
@@ -276,15 +276,14 @@ module ActionDispatch
       LOCALHOST =~ remote_addr && LOCALHOST =~ remote_ip
     end
 
-    protected
-
     # Remove nils from the params hash
     def deep_munge(hash)
-      hash.each_value do |v|
+      hash.each do |k, v|
         case v
         when Array
           v.grep(Hash) { |x| deep_munge(x) }
           v.compact!
+          hash[k] = nil if v.empty?
         when Hash
           deep_munge(v)
         end
@@ -293,6 +292,8 @@ module ActionDispatch
       hash
     end
 
+    protected
+
     def parse_query(qs)
       deep_munge(super)
     end
diff --git a/actionpack/lib/action_dispatch/middleware/params_parser.rb b/actionpack/lib/action_dispatch/middleware/params_parser.rb
index 2c98ca03a8..951f28f535 100644
--- a/actionpack/lib/action_dispatch/middleware/params_parser.rb
+++ b/actionpack/lib/action_dispatch/middleware/params_parser.rb
@@ -47,12 +47,12 @@ module ActionDispatch
         when Proc
           strategy.call(request.raw_post)
         when :xml_simple, :xml_node
-          data = Hash.from_xml(request.raw_post) || {}
+          data = request.deep_munge(Hash.from_xml(request.body.read) || {})
           data.with_indifferent_access
         when :yaml
           YAML.load(request.raw_post)
         when :json
-          data = ActiveSupport::JSON.decode(request.raw_post)
+          data = request.deep_munge ActiveSupport::JSON.decode(request.body)
           data = {:_json => data} unless data.is_a?(Hash)
           data.with_indifferent_access
         else