[wasm] Add UTF-8 validation

src/wasm/wasm-function-name-table.cc

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/wasm/wasm-function-name-table.h"
 
 #include "src/wasm/wasm-module.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 42 matching lines @@
   auto undefined = [&func_names_array]() -> Handle<Object> {
     return func_names_array->GetIsolate()->factory()->undefined_value();
   };
   if (func_index >= num_funcs) return undefined();
   int offset = func_names_array->get_int(func_index + 1);
   int next_offset = func_index == num_funcs - 1
                         ? func_names_array->length()
                         : func_names_array->get_int(func_index + 2);
   ScopedVector<byte> buffer(next_offset - offset);
   func_names_array->copy_out(offset, buffer.start(), next_offset - offset);
+  if (!unibrow::Utf8::Validate(buffer.start(), buffer.length())) {
+    return undefined();
+  }
   MaybeHandle<Object> maybe_name =
       func_names_array->GetIsolate()->factory()->NewStringFromUtf8(
           Vector<const char>::cast(buffer));
   return maybe_name.is_null() ? undefined() : maybe_name.ToHandleChecked();
 }
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8