diff --git a/base/src/file_ex.cpp b/base/src/file_ex.cpp
index 7ad317c9ea35c2b0226f105c84974dd5562f9923..8238e80112f3bdee58f08f0c3ee4c5678bc9fca7 100644
--- a/base/src/file_ex.cpp
+++ b/base/src/file_ex.cpp
@@ -117,7 +117,7 @@ bool LoadStringFromFile(const string& filePath, string& content)
 
     file.seekg(0, ios::end);
     const long long fileLength = file.tellg();
-    if (fileLength > MAX_FILE_LENGTH) {
+    if (fileLength < 0 || fileLength > MAX_FILE_LENGTH) {
         UTILS_LOGD("invalid file length(%{public}lld)!", fileLength);
         return false;
     }