diff --git a/mindspore/lite/src/common/utils.cc b/mindspore/lite/src/common/utils.cc
index 75ef38caffe..6dc7dd43fa7 100644
--- a/mindspore/lite/src/common/utils.cc
+++ b/mindspore/lite/src/common/utils.cc
@@ -54,6 +54,10 @@ uint64_t GetTimeUs() {
 
 std::string RemoveSubStr(const std::string &from, const std::string &sub_str, RemoveSubStrMode mode) {
   std::string result = from;
+  if (from.empty()) {
+    MS_LOG(ERROR) << "string is empty";
+    return "";
+  }
   if (mode == PREFIX) {
     if (from.substr(0, sub_str.length()) == sub_str) {
       result = from.substr(sub_str.size());
@@ -73,6 +77,10 @@ std::string RemoveSubStr(const std::string &from, const std::string &sub_str, Re
 }
 
 std::vector<std::string> StrSplit(const std::string &str, const std::string &pattern) {
+  if (str.empty()) {
+    MS_LOG(ERROR) << "string is empty";
+    return {};
+  }
   std::string::size_type pos;
   std::vector<std::string> result;
   std::string tmpStr(str + pattern);
@@ -95,6 +103,11 @@ std::vector<std::string> Tokenize(const std::string &src, const std::string &del
     return {};
   }
 
+  if (src.empty()) {
+    MS_LOG(ERROR) << "string is empty";
+    return {};
+  }
+
   std::vector<std::string> tokens;
   size_t offset = 0;
 
diff --git a/mindspore/lite/src/common/utils.h b/mindspore/lite/src/common/utils.h
index 7b43164bb23..db023d6b3ed 100644
--- a/mindspore/lite/src/common/utils.h
+++ b/mindspore/lite/src/common/utils.h
@@ -106,6 +106,11 @@ inline Option<std::string> ToString(bool value) {
 // get the file name from a given path
 // for example: "/usr/bin", we will get "bin"
 inline std::string GetFileName(const std::string &path) {
+  if (path.empty()) {
+    MS_LOG(ERROR) << "string is empty";
+    return "";
+  }
+
   char delim = '/';
 
   size_t i = path.rfind(delim, path.length());
diff --git a/mindspore/lite/src/executor.cc b/mindspore/lite/src/executor.cc
index da51192cf0b..b8a816e5a93 100644
--- a/mindspore/lite/src/executor.cc
+++ b/mindspore/lite/src/executor.cc
@@ -19,7 +19,7 @@
 #include "include/errorcode.h"
 
 namespace mindspore::lite {
-int Executor::CheckInputs(std::vector<Tensor *> &in_tensors) {
+int Executor::CheckInputs(const std::vector<Tensor *> &in_tensors) {
   for (auto &inTensor : in_tensors) {
     if (inTensor == nullptr) {
       MS_LOG(ERROR) << "Graph input tensor is nullptr";
diff --git a/mindspore/lite/src/executor.h b/mindspore/lite/src/executor.h
index d9bfd6ae9bf..220361c9b89 100644
--- a/mindspore/lite/src/executor.h
+++ b/mindspore/lite/src/executor.h
@@ -35,7 +35,7 @@ class Executor {
                   const KernelCallBack &before = nullptr, const KernelCallBack &after = nullptr);
 
  protected:
-  static int CheckInputs(std::vector<Tensor *> &in_tensors);
+  static int CheckInputs(const std::vector<Tensor *> &in_tensors);
 };
 }  // namespace mindspore::lite
 #endif
diff --git a/mindspore/lite/src/runtime/allocator.cc b/mindspore/lite/src/runtime/allocator.cc
index 867e4083708..35ac8a7854d 100644
--- a/mindspore/lite/src/runtime/allocator.cc
+++ b/mindspore/lite/src/runtime/allocator.cc
@@ -88,6 +88,7 @@ void DefaultAllocator::Free(void *buf) {
   }
   UnLock();
   free(buf);
+  buf = nullptr;
 }
 
 size_t DefaultAllocator::GetTotalSize() {
diff --git a/mindspore/lite/tools/anf_importer/import_from_protobuf.cc b/mindspore/lite/tools/anf_importer/import_from_protobuf.cc
index 23783252e1c..24797122b82 100644
--- a/mindspore/lite/tools/anf_importer/import_from_protobuf.cc
+++ b/mindspore/lite/tools/anf_importer/import_from_protobuf.cc
@@ -416,6 +416,10 @@ bool AnfImporterFromProtobuf::GetAttrValueForCNode(const PrimitivePtr &prim, con
     return false;
   }
   const std::string &ref_attr_name = attr_proto.ref_attr_name();
+  if (ref_attr_name.empty()) {
+    MS_LOG(ERROR) << "ref_attr_name is empty";
+    return false;
+  }
   string type = "";
   std::size_t pos(0);
   if ((pos = ref_attr_name.find("scalar:")) != std::string::npos) {
@@ -520,6 +524,10 @@ bool AnfImporterFromProtobuf::GetAttrValueForValueNode(const std::string &value_
     return false;
   }
   const std::string &ref_attr_name = attr_proto.ref_attr_name();
+  if (ref_attr_name.empty()) {
+    MS_LOG(ERROR) << "ref_attr_name is empty";
+    return false;
+  }
   string type = "";
   std::size_t pos(0);
   if ((pos = ref_attr_name.find("scalar:")) != std::string::npos) {