[Bug #19754] Make `IO::Buffer#get_string` check `offset` range (#8016)

1 files changed, 8 insertions, 0 deletions

diff --git a/test/ruby/test_io_buffer.rb b/test/ruby/test_io_buffer.rb
index 75ec4016fa..c3ab09f27e 100644
--- a/test/ruby/test_io_buffer.rb
+++ b/test/ruby/test_io_buffer.rb
@@ -251,6 +251,14 @@ class TestIOBuffer < Test::Unit::TestCase
 
     chunk = buffer.get_string(0, message.bytesize, Encoding::BINARY)
     assert_equal Encoding::BINARY, chunk.encoding
+
+    assert_raise_with_message(ArgumentError, /exceeds buffer size/) do
+      buffer.get_string(0, 129)
+    end
+
+    assert_raise_with_message(ArgumentError, /exceeds buffer size/) do
+      buffer.get_string(129)
+    end
   end
 
   # We check that values are correctly round tripped.