[ruby/yaml] Also use safe_load with each_value, values and shift

https://github.com/ruby/yaml/commit/f47d6123eb

lib/yaml/dbm.rb

@@ -158,7 +158,7 @@ class DBM < ::DBM
     #
     # Returns +self+.
     def each_value # :yields: value
-        super { |v| yield YAML.load( v ) }
+        super { |v| yield YAML.respond_to?(:safe_load) ? YAML.safe_load( v ) : YAML.load( v ) }
         self
     end
 
@@ -167,7 +167,7 @@ class DBM < ::DBM
     #
     # Returns an array of values from the database.
     def values
-        super.collect { |v| YAML.load( v ) }
+        super.collect { |v| YAML.respond_to?(:safe_load) ? YAML.safe_load( v ) : YAML.load( v ) }
     end
 
     # :call-seq:
@@ -213,7 +213,9 @@ class DBM < ::DBM
     # The order in which values are removed/returned is not guaranteed.
     def shift
         a = super
-        a[1] = YAML.load( a[1] ) if a
+        if a
+          a[1] = YAML.respond_to?(:safe_load) ? YAML.safe_load( a[1] ) : YAML.load( a[1] )
+        end
         a
     end
 

test/yaml/test_dbm.rb

@@ -22,4 +22,25 @@ class TestYAMLDBM < Test::Unit::TestCase
     assert_equal "value", @dbm.delete("key")
     assert_nil @dbm["key"]
   end
+
+  def test_each_value
+    @dbm["key1"] = "value1"
+    @dbm["key2"] = "value2"
+    @dbm.each_value do |value|
+      assert_match(/value[12]/, value)
+    end
+  end
+
+  def test_values
+    @dbm["key1"] = "value1"
+    @dbm["key2"] = "value2"
+    @dbm.values.each do |value|
+      assert_match(/value[12]/, value)
+    end
+  end
+
+  def test_shift
+    @dbm["key"] = "value"
+    assert_equal ["key", "value"], @dbm.shift
+  end
 end