[wasm] Fix bounds check for zero initial memory.

src/wasm/wasm-interpreter.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-interpreter.h"
 
 #include "src/utils.h"
 #include "src/wasm/ast-decoder.h"
 #include "src/wasm/decoder.h"
 #include "src/wasm/wasm-external-refs.h"
@@ skipping 650 matching lines @@
   if (delta_pages > wasm::WasmModule::kMaxMemPages) {
     return -1;
   }
   uint32_t old_size = instance->mem_size;
   uint32_t new_size;
   byte* new_mem_start;
   if (instance->mem_size == 0) {
     if (delta_pages > wasm::WasmModule::kMaxMemPages) {
       return -1;
     }
-    // TODO(gdeepti): Fix bounds check to take into account size of memtype.
     new_size = delta_pages * wasm::WasmModule::kPageSize;
     new_mem_start = static_cast<byte*>(calloc(new_size, sizeof(byte)));
     if (!new_mem_start) {
       return -1;
     }
   } else {
     DCHECK_NOT_NULL(instance->mem_start);
     new_size = old_size + delta_pages * wasm::WasmModule::kPageSize;
     if (new_size >
         wasm::WasmModule::kMaxMemPages * wasm::WasmModule::kPageSize) {
@@ skipping 1162 matching lines @@
 
 ControlTransferMap WasmInterpreter::ComputeControlTransfersForTesting(
     Zone* zone, const byte* start, const byte* end) {
   ControlTransfers targets(zone, nullptr, nullptr, start, end);
   return targets.map_;
 }
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8