Fix an OOB read through CallSite.GetFunctionName

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 36 matching lines @@
     ++func_index;
   }
   return func_names_array;
 }
 
 MaybeHandle<String> GetWasmFunctionNameFromTable(
     Handle<ByteArray> func_names_array, uint32_t func_index) {
   uint32_t num_funcs = static_cast<uint32_t>(func_names_array->get_int(0));
   DCHECK(static_cast<int>(num_funcs) >= 0);
   Factory* factory = func_names_array->GetIsolate()->factory();
-  DCHECK(func_index < num_funcs);
+  if (func_index >= num_funcs) return {};
   int offset = func_names_array->get_int(func_index + 1);
   if (offset < 0) return {};
   int next_offset = func_index == num_funcs - 1
                         ? func_names_array->length()
                         : abs(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 {};
   return factory->NewStringFromUtf8(Vector<const char>::cast(buffer));
 }
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8