diff --git a/interfaces/kits/cj/src/copy.cpp b/interfaces/kits/cj/src/copy.cpp
index 5f9647e63afeb1ad15c4c8c3192848b0da981145..7cded9586d5a124fdf43abf19ccb58afe0b4266c 100644
--- a/interfaces/kits/cj/src/copy.cpp
+++ b/interfaces/kits/cj/src/copy.cpp
@@ -494,6 +494,9 @@ void CopyImpl::ReadNotifyEvent(std::shared_ptr<FileInfos> infos)
     auto callback = GetRegisteredListener(infos);
     while (((len = read(infos->notifyFd, &buf, sizeof(buf))) < 0) && (errno == EINTR)) {}
     while (infos->run && index < len) {
+        if ((index + sizeof(struct inotify_event)) > len) {
+            break;
+        }
         event = reinterpret_cast<inotify_event *>(buf + index);
         auto [needContinue, errCode, needSend] = HandleProgress(event, infos, callback);
         if (!needContinue) {