Initialize value before creating slice

test/cpp/qps/client.h

@@ -94,9 +94,11 @@ class ClientRequestCreator<ByteBuffer> {
  public:
   ClientRequestCreator(ByteBuffer* req, const PayloadConfig& payload_config) {
     if (payload_config.has_bytebuf_params()) {
-      std::unique_ptr<char[]> buf(
-          new char[payload_config.bytebuf_params().req_size()]);
-      Slice slice(buf.get(), payload_config.bytebuf_params().req_size());
+      size_t req_sz =
+          static_cast<size_t>(payload_config.bytebuf_params().req_size());
+      std::unique_ptr<char[]> buf(new char[req_sz]);
+      memset(buf.get(), 0, req_sz);
+      Slice slice(buf.get(), req_sz);
       *req = ByteBuffer(&slice, 1);
     } else {
       GPR_ASSERT(false);  // not appropriate for this specialization

test/cpp/qps/server_async.cc

@@ -562,6 +562,7 @@ static Status ProcessGenericRPC(const PayloadConfig& payload_config,
   request->Clear();
   int resp_size = payload_config.bytebuf_params().resp_size();
   std::unique_ptr<char[]> buf(new char[resp_size]);
+  memset(buf.get(), 0, static_cast<size_t>(resp_size));
   Slice slice(buf.get(), resp_size);
   *response = ByteBuffer(&slice, 1);
   return Status::OK;