diff --git a/services/sensor/src/sensor_data_processer.cpp b/services/sensor/src/sensor_data_processer.cpp
index 0a543ffc9527cc78bbbc6d1510a8ff8d2dedaa1a..1c3bd0605ff55eafeb6c8650be1830c8be92561f 100644
--- a/services/sensor/src/sensor_data_processer.cpp
+++ b/services/sensor/src/sensor_data_processer.cpp
@@ -240,9 +240,9 @@ void SensorDataProcesser::SendRawData(std::unordered_map<uint32_t, struct Sensor
         return;
     }
 
-    int32_t eventSize = static_cast<int32_t>(event.size());
+    size_t eventSize = event.size();
     std::vector<struct TransferSensorEvents> transferEvents;
-    for (int32_t i = 0; i < eventSize; i++) {
+    for (size_t i = 0; i < eventSize; i++) {
         struct TransferSensorEvents  transferEvent = {
             .sensorTypeId = event[i].sensorTypeId,
             .version = event[i].version,
diff --git a/utils/src/report_data_callback.cpp b/utils/src/report_data_callback.cpp
index 3f00ae3552ae46dc2714dcded49d94cb3273c574..425266e0c9a5f6703b7dc45afc0afcc9b58af7f6 100644
--- a/utils/src/report_data_callback.cpp
+++ b/utils/src/report_data_callback.cpp
@@ -66,6 +66,13 @@ int32_t ReportDataCallback::ReportEventCallback(const struct SensorEvent* event,
     }
     int32_t leftSize = CIRCULAR_BUF_LEN - cb->eventsBuf_.eventNum;
     int32_t toEndLen = CIRCULAR_BUF_LEN - cb->eventsBuf_.writePosition;
+    if (leftSize < 0 || toEndLen < 0) {
+        SEN_HILOGE("Leftsize and toendlen cannot be less than zero");
+        if (event->data != nullptr) {
+            delete[] event->data;
+        }
+        return ERROR;
+    }
     if (toEndLen == 0) {
             cb->eventsBuf_.circularBuf[0] = *event;
             cb->eventsBuf_.writePosition = 1 - toEndLen;