1 files changed, 18 insertions, 0 deletions
diff --git a/test/rexml/test_entity.rb b/test/rexml/test_entity.rb
index e6d6f29007..5900fac7a8 100644
--- a/test/rexml/test_entity.rb
+++ b/test/rexml/test_entity.rb
@@ -104,6 +104,24 @@ class EntityTester < Test::Unit::TestCase
     assert_equal source, out
   end
 
+  def test_entity_string_limit
+    template = '<!DOCTYPE bomb [ <!ENTITY a "^" > ]> <bomb>$</bomb>'
+    len      = 5120 # 5k per entity
+    template.sub!(/\^/, "B" * len)
+
+    # 10k is OK
+    entities = '&a;' * 2 # 5k entity * 2 = 10k
+    xmldoc = REXML::Document.new(template.sub(/\$/, entities))
+    assert_equal(len * 2, xmldoc.root.text.bytesize)
+
+    # above 10k explodes
+    entities = '&a;' * 3 # 5k entity * 2 = 15k
+    xmldoc = REXML::Document.new(template.sub(/\$/, entities))
+    assert_raises(RuntimeError) do
+      xmldoc.root.text
+    end
+  end
+
   def test_raw
     source = '<!DOCTYPE foo [
 <!ENTITY ent "replace">