[wasm] Verify boundaries of data segments when decoding modules.

src/wasm/wasm-js.cc

Index: src/wasm/wasm-js.cc
diff --git a/src/wasm/wasm-js.cc b/src/wasm/wasm-js.cc
index 7944a621e677e65796d9a50100913e783be1b5d1..b40959219b0af256e0c0aa5117e822824cf6cdc1 100644
--- a/src/wasm/wasm-js.cc
+++ b/src/wasm/wasm-js.cc
@@ -37,6 +37,7 @@ struct RawBuffer {
 
 RawBuffer GetRawBufferArgument(
     ErrorThrower& thrower, const v8::FunctionCallbackInfo<v8::Value>& args) {
+  // TODO(titzer): allow typed array views.
   if (args.Length() < 1 || !args[0]->IsArrayBuffer()) {
     thrower.Error("Argument 0 must be an array buffer");
     return {nullptr, nullptr};
@@ -44,8 +45,6 @@ RawBuffer GetRawBufferArgument(
   Local<ArrayBuffer> buffer = Local<ArrayBuffer>::Cast(args[0]);
   ArrayBuffer::Contents contents = buffer->GetContents();
 
-  // TODO(titzer): allow offsets into buffers, views, etc.
-
   const byte* start = reinterpret_cast<const byte*>(contents.Data());
   const byte* end = start + contents.ByteLength();