diff --git a/mindspore/lite/src/inner_context.cc b/mindspore/lite/src/inner_context.cc
index 76ce01761b..f6c6f3a373 100644
--- a/mindspore/lite/src/inner_context.cc
+++ b/mindspore/lite/src/inner_context.cc
@@ -64,6 +64,10 @@ int InnerContext::IsValid() {
     MS_LOG(ERROR) << "Device list is empty.";
     return RET_NOT_SUPPORT;
   }
+  if (!IsCpuEnabled()) {
+    MS_LOG(ERROR) << "CPU is not supported.";
+    return RET_NOT_SUPPORT;
+  }
 #ifndef SUPPORT_GPU
   if (IsGpuEnabled()) {
     MS_LOG(ERROR) << "GPU is not supported.";
diff --git a/mindspore/lite/src/lite_kernel.cc b/mindspore/lite/src/lite_kernel.cc
index f0ea27d8bf..9ffbcab6cc 100644
--- a/mindspore/lite/src/lite_kernel.cc
+++ b/mindspore/lite/src/lite_kernel.cc
@@ -95,6 +95,11 @@ int LiteKernel::PreProcess() {
   for (auto *output : outputs) {
     MS_ASSERT(output != nullptr);
 
+    if (output->ElementsNum() >= MAX_MALLOC_SIZE / static_cast<int>(sizeof(int64_t))) {
+      MS_LOG(ERROR) << "The size of output tensor is too big";
+      return RET_ERROR;
+    }
+
     auto ret = output->MallocData();
     if (ret != RET_OK) {
       MS_LOG(ERROR) << "MallocData failed";
diff --git a/mindspore/lite/src/model_common.cc b/mindspore/lite/src/model_common.cc
index eae287a027..4ed019458b 100644
--- a/mindspore/lite/src/model_common.cc
+++ b/mindspore/lite/src/model_common.cc
@@ -14,33 +14,39 @@
  * limitations under the License.
  */
 #include "src/model_common.h"
+#include "src/ops/while.h"
 
 namespace mindspore::lite {
 int ConvertSubGraph(const schema::SubGraph &sub_graph, Model *model) {
-  MS_ASSERT(model != nullptr);
+  if (model == nullptr) {
+    MS_LOG(ERROR) << "model is null.";
+    return RET_ERROR;
+  }
+  if (sub_graph.name() == nullptr || sub_graph.inputIndices() == nullptr || sub_graph.outputIndices() == nullptr ||
+      sub_graph.nodeIndices() == nullptr || sub_graph.tensorIndices() == nullptr) {
+    MS_LOG(ERROR) << "sub_graph is invalid.";
+    return RET_ERROR;
+  }
+
   auto *subgraph = new (std::nothrow) Model::SubGraph();
   if (subgraph == nullptr) {
     MS_LOG(ERROR) << "new subGraph fail!";
     return RET_ERROR;
   }
-  MS_ASSERT(sub_graph.name() != nullptr);
+
   subgraph->name_ = sub_graph.name()->c_str();
-  MS_ASSERT(sub_graph.inputIndices() != nullptr);
   auto in_count = sub_graph.inputIndices()->size();
   for (uint32_t i = 0; i < in_count; ++i) {
     subgraph->input_indices_.push_back(sub_graph.inputIndices()->Get(i));
   }
-  MS_ASSERT(sub_graph.outputIndices() != nullptr);
   auto out_count = sub_graph.outputIndices()->size();
   for (uint32_t i = 0; i < out_count; ++i) {
     subgraph->output_indices_.push_back(sub_graph.outputIndices()->Get(i));
   }
-  MS_ASSERT(sub_graph.nodeIndices() != nullptr);
   auto node_count = sub_graph.nodeIndices()->size();
   for (uint32_t i = 0; i < node_count; ++i) {
     subgraph->node_indices_.push_back(sub_graph.nodeIndices()->Get(i));
   }
-  MS_ASSERT(sub_graph.tensorIndices() != nullptr);
   auto tensor_count = sub_graph.tensorIndices()->size();
   for (uint32_t i = 0; i < tensor_count; ++i) {
     subgraph->tensor_indices_.push_back(sub_graph.tensorIndices()->Get(i));
@@ -50,6 +56,10 @@ int ConvertSubGraph(const schema::SubGraph &sub_graph, Model *model) {
 }
 
 int VersionVerify(flatbuffers::Verifier *verify) {
+  if (verify == nullptr) {
+    MS_LOG(ERROR) << "verify is null.";
+    return RET_ERROR;
+  }
   if (schema::VerifyMetaGraphBuffer(*verify)) {
     return SCHEMA_VERSION::SCHEMA_CUR;
   } else if (schema::v0::VerifyMetaGraphBuffer(*verify)) {
@@ -58,8 +68,90 @@ int VersionVerify(flatbuffers::Verifier *verify) {
   return SCHEMA_VERSION::SCHEMA_INVALID;
 }
 
+int NodeVerify(const Model &model) {
+  auto tensor_size = model.all_tensors_.size();
+  uint32_t subGraph_size = model.sub_graphs_.size();
+
+  for (auto &node : model.all_nodes_) {
+    if (node == nullptr || node->primitive_ == nullptr) {
+      MS_LOG(ERROR) << "node or its primitive_ is null.";
+      return RET_ERROR;
+    }
+    if (std::any_of(node->input_indices_.begin(), node->input_indices_.end(),
+                    [&tensor_size](const uint32_t &idx) { return idx >= tensor_size; })) {
+      MS_LOG(ERROR) << "Index of node->input_indices_ is beyond size.";
+      return RET_ERROR;
+    }
+    if (std::any_of(node->output_indices_.begin(), node->output_indices_.end(),
+                    [&tensor_size](const uint32_t &idx) { return idx >= tensor_size; })) {
+      MS_LOG(ERROR) << "Index of node->output_indices_ is beyond size.";
+      return RET_ERROR;
+    }
+
+    auto prim = node->primitive_;
+    if (prim->Type() == schema::PrimitiveType_While) {
+      auto whileOp = reinterpret_cast<mindspore::lite::While *>(const_cast<mindspore::lite::PrimitiveC *>(prim));
+      if (whileOp == nullptr) {
+        MS_LOG(ERROR) << "whileOp is null.";
+        return RET_ERROR;
+      }
+      if (static_cast<uint32_t>(whileOp->GetBodySubgraphIndex()) >= subGraph_size ||
+          static_cast<uint32_t>(whileOp->GetCondSubgraphIndex()) >= subGraph_size) {
+        MS_LOG(ERROR) << "index of subGraph is beyond subGraph_size.";
+        return RET_ERROR;
+      }
+    }
+  }
+  return RET_OK;
+}
+
+int SubGraphVerify(const Model &model) {
+  auto tensor_size = model.all_tensors_.size();
+  auto node_size = model.all_nodes_.size();
+
+  for (auto &graph : model.sub_graphs_) {
+    if (graph == nullptr) {
+      MS_LOG(ERROR) << "graph is null.";
+      return RET_ERROR;
+    }
+    if (std::any_of(graph->input_indices_.begin(), graph->input_indices_.end(),
+                    [&tensor_size](const uint32_t &idx) { return idx >= tensor_size; })) {
+      MS_LOG(ERROR) << "Index of graph->input_indices_ is beyond tensor_size.";
+      return RET_ERROR;
+    }
+    if (std::any_of(graph->output_indices_.begin(), graph->output_indices_.end(),
+                    [&tensor_size](const uint32_t &idx) { return idx >= tensor_size; })) {
+      MS_LOG(ERROR) << "Index of graph->output_indices_ is beyond tensor_size.";
+      return RET_ERROR;
+    }
+    if (std::any_of(graph->tensor_indices_.begin(), graph->tensor_indices_.end(),
+                    [&tensor_size](const uint32_t &idx) { return idx >= tensor_size; })) {
+      MS_LOG(ERROR) << "Index of graph->tensor_indices_ is beyond tensor_size.";
+      return RET_ERROR;
+    }
+    if (std::any_of(graph->node_indices_.begin(), graph->node_indices_.end(),
+                    [&node_size](const uint32_t &idx) { return idx >= node_size; })) {
+      MS_LOG(ERROR) << "Index of graph->node_indices_ is beyond node_size.";
+      return RET_ERROR;
+    }
+  }
+  return RET_OK;
+}
+
+int ModelVerify(const Model &model, const int &schema_version) {
+  if (schema_version == SCHEMA_VERSION::SCHEMA_CUR) {
+    return NodeVerify(model) == RET_OK && SubGraphVerify(model) == RET_OK;
+  } else if (schema_version == SCHEMA_VERSION::SCHEMA_V0) {
+    return NodeVerify(model) == RET_OK;
+  }
+  return RET_ERROR;
+}
+
 const void *GetMetaGraphByVerison(const char *buf, const int &schema_version) {
-  MS_ASSERT(buf != nullptr);
+  if (buf == nullptr) {
+    MS_LOG(ERROR) << "buf is null.";
+    return nullptr;
+  }
   if (schema_version == SCHEMA_VERSION::SCHEMA_CUR) {
     return reinterpret_cast<const void *>(schema::GetMetaGraph(buf));
   } else if (schema_version == SCHEMA_VERSION::SCHEMA_V0) {
@@ -69,8 +161,10 @@ const void *GetMetaGraphByVerison(const char *buf, const int &schema_version) {
 }
 
 int GenerateModelByVersion(const void *meta_graph, Model *model, const int &schema_version) {
-  MS_ASSERT(meta_graph != nullptr);
-  MS_ASSERT(model != nullptr);
+  if (meta_graph == nullptr || model == nullptr) {
+    MS_LOG(ERROR) << "meta_graph or model is null.";
+    return RET_ERROR;
+  }
   int status = RET_ERROR;
   if (schema_version == SCHEMA_VERSION::SCHEMA_CUR) {
     status = GenerateModel<schema::MetaGraph, schema::CNode>(*reinterpret_cast<const schema::MetaGraph *>(meta_graph),
@@ -135,6 +229,7 @@ Model *ImportFromBuffer(const char *model_buf, size_t size, bool take_buf) {
     delete (model);
     return nullptr;
   }
-  return model;
+
+  return ModelVerify(*model, schema_version) ? model : nullptr;
 }
 }  // namespace mindspore::lite
diff --git a/mindspore/lite/src/model_common.h b/mindspore/lite/src/model_common.h
index e2a68a4930..b51455129a 100644
--- a/mindspore/lite/src/model_common.h
+++ b/mindspore/lite/src/model_common.h
@@ -33,9 +33,8 @@ int ConvertSubGraph(const schema::SubGraph &sub_graph, Model *model);
 
 template <typename T = schema::MetaGraph, typename U = schema::CNode>
 bool ConvertNodes(const T &meta_graph, Model *model, int schema_version = SCHEMA_CUR) {
-  MS_ASSERT(model != nullptr);
-  if (meta_graph.nodes() == nullptr) {
-    MS_LOG(ERROR) << "meta_graph is invalid, please check your model file.";
+  if (model == nullptr || meta_graph.nodes() == nullptr) {
+    MS_LOG(ERROR) << "model or meta_graph is invalid, please check your model file.";
     return false;
   }
   for (size_t i = 0; i < meta_graph.nodes()->size(); ++i) {
@@ -84,9 +83,8 @@ bool ConvertNodes(const T &meta_graph, Model *model, int schema_version = SCHEMA
 
 template <typename T = schema::MetaGraph>
 bool ConvertTensors(const T &meta_graph, Model *model) {
-  MS_ASSERT(model != nullptr);
-  if (meta_graph.allTensors() == nullptr) {
-    MS_LOG(ERROR) << "meta_graph is invalid, please check your model file.";
+  if (model == nullptr || meta_graph.allTensors() == nullptr) {
+    MS_LOG(ERROR) << "model or meta_graph is invalid, please check your model file.";
     return false;
   }
   auto tensor_count = meta_graph.allTensors()->size();
@@ -103,10 +101,9 @@ bool ConvertTensors(const T &meta_graph, Model *model) {
 
 template <typename T = schema::MetaGraph>
 int MetaGraphMappingSubGraph(const T &meta_graph, Model *model) {
-  MS_ASSERT(model != nullptr);
-  if (meta_graph.inputIndex() == nullptr || meta_graph.outputIndex() == nullptr || meta_graph.nodes() == nullptr ||
-      meta_graph.allTensors() == nullptr) {
-    MS_LOG(ERROR) << "meta_graph is invalid, please check your model file.";
+  if (model == nullptr || meta_graph.inputIndex() == nullptr || meta_graph.outputIndex() == nullptr ||
+      meta_graph.nodes() == nullptr || meta_graph.allTensors() == nullptr) {
+    MS_LOG(ERROR) << "model or meta_graph is invalid, please check your model file.";
     return RET_ERROR;
   }
   auto *subgraph = new (std::nothrow) Model::SubGraph();
@@ -139,7 +136,10 @@ int MetaGraphMappingSubGraph(const T &meta_graph, Model *model) {
 
 template <typename T = schema::MetaGraph, typename U = schema::CNode>
 int GenerateModel(const T &meta_graph, Model *model, int schema_version = 0) {
-  MS_ASSERT(model != nullptr);
+  if (model == nullptr) {
+    MS_LOG(ERROR) << "model is nullptr.";
+    return RET_ERROR;
+  }
   if (meta_graph.name() != nullptr) {
     model->name_ = meta_graph.name()->c_str();
   }
@@ -177,6 +177,12 @@ int GenerateModel(const T &meta_graph, Model *model, int schema_version = 0) {
 
 int VersionVerify(flatbuffers::Verifier *verify);
 
+int NodeVerify(const Model &model);
+
+int SubGraphVerify(const Model &model);
+
+int ModelVerify(const Model &model, const int &schema_version);
+
 const void *GetMetaGraphByVerison(const char *buf, const int &schema_version);
 
 int GenerateModelByVersion(const void *meta_graph, Model *model, const int &schema_version);
diff --git a/mindspore/lite/src/scheduler.cc b/mindspore/lite/src/scheduler.cc
index 5e72a4c345..0a9a189617 100644
--- a/mindspore/lite/src/scheduler.cc
+++ b/mindspore/lite/src/scheduler.cc
@@ -123,6 +123,13 @@ int Scheduler::InferShape(const lite::Model *model, std::vector<Tensor *> *tenso
       MS_LOG(ERROR) << "InferShape failed, name: " << node->name_ << ", type: "
                     << schema::EnumNamePrimitiveType(static_cast<schema::PrimitiveType>(primitive->Type()));
       return RET_INFER_ERR;
+    } else {
+      for (auto &output : outputs) {
+        if (output->ElementsNum() >= MAX_MALLOC_SIZE / static_cast<int>(sizeof(int64_t))) {
+          MS_LOG(ERROR) << "The size of output tensor is too big";
+          return RET_ERROR;
+        }
+      }
     }
   }
 
diff --git a/mindspore/lite/tools/converter/parser/onnx/onnx_relu_parser.cc b/mindspore/lite/tools/converter/parser/onnx/onnx_relu_parser.cc
index c4b260b43e..54d9154613 100644
--- a/mindspore/lite/tools/converter/parser/onnx/onnx_relu_parser.cc
+++ b/mindspore/lite/tools/converter/parser/onnx/onnx_relu_parser.cc
@@ -100,7 +100,7 @@ STATUS OnnxPReluParser::Parse(const onnx::GraphProto &onnx_graph, const onnx::No
     } else {
       attr->slope.resize(slope_size);
       attr->channelShared = false;
-      if (memcpy_s(attr->slope.data(), slope_size * sizeof(float), slope_raw_data, slope_size * sizeof(float)) != 0) {
+      if (memcpy_s(attr->slope.data(), slope_size * sizeof(float), slope_raw_data, slope_size * sizeof(float)) != EOK) {
         MS_LOG(ERROR) << "memcpy_s failed";
         return RET_ERROR;
       }