1 files changed, 31 insertions, 0 deletions
diff --git a/pkg/p9/buffer_test.go b/pkg/p9/buffer_test.go
new file mode 100644
index 000000000..97eceefa7
--- /dev/null
+++ b/pkg/p9/buffer_test.go
@@ -0,0 +1,31 @@
+// Copyright 2018 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package p9
+
+import (
+	"testing"
+)
+
+func TestBufferOverrun(t *testing.T) {
+	buf := &buffer{
+		// This header indicates that a large string should follow, but
+		// it is only two bytes. Reading a string should cause an
+		// overrun.
+		data: []byte{0x0, 0x16},
+	}
+	if s := buf.ReadString(); s != "" {
+		t.Errorf("overrun read got %s, want empty", s)
+	}
+}