void QuicClientPromisedInfo::OnPromiseHeaders(const SpdyHeaderBlock& headers) {
   SpdyHeaderBlock::const_iterator it = headers.find(kHttp2MethodHeader);
  if (it == headers.end()) {
    QUIC_DVLOG(1) << "Promise for stream " << id_ << " has no method";
    Reset(QUIC_INVALID_PROMISE_METHOD);
    return;
  }
   if (!(it->second == "GET" || it->second == "HEAD")) {
     QUIC_DVLOG(1) << "Promise for stream " << id_ << " has invalid method "
                   << it->second;
    Reset(QUIC_INVALID_PROMISE_METHOD);
    return;
  }
  if (!SpdyUtils::UrlIsValid(headers)) {
    QUIC_DVLOG(1) << "Promise for stream " << id_ << " has invalid URL "
                  << url_;
    Reset(QUIC_INVALID_PROMISE_URL);
    return;
  }
  if (!session_->IsAuthorized(SpdyUtils::GetHostNameFromHeaderBlock(headers))) {
    Reset(QUIC_UNAUTHORIZED_PROMISE_URL);
    return;
  }
  request_headers_.reset(new SpdyHeaderBlock(headers.Clone()));
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.