diff --git a/source/libs/function/src/tudf.c b/source/libs/function/src/tudf.c
index b5bb2d813a..4efa8764e5 100644
--- a/source/libs/function/src/tudf.c
+++ b/source/libs/function/src/tudf.c
@@ -1569,7 +1569,7 @@ int32_t udfcGetUdfTaskResultFromUvTask(SClientUdfTask *task, SClientUvTaskNode *
       }
 
       // TODO: the call buffer is setup and freed by udf invocation
-      taosMemoryFree(uvTask->rspBuf.base);
+      taosMemoryFreeClear(uvTask->rspBuf.base);
     } else {
       code = uvTask->errCode;
       if (code != 0) {
@@ -1794,7 +1794,7 @@ int32_t udfcInitializeUvTask(SClientUdfTask *task, int8_t uvTaskType, SClientUvT
   }
   if (uv_sem_init(&uvTask->taskSem, 0) != 0) {
     if (uvTaskType == UV_TASK_REQ_RSP) {
-      taosMemoryFree(uvTask->reqBuf.base);
+      taosMemoryFreeClear(uvTask->reqBuf.base);
     }
     fnError("udfc create uv task, init semaphore failed.");
     return TSDB_CODE_UDF_UV_EXEC_FAILURE;
diff --git a/source/libs/function/src/udfd.c b/source/libs/function/src/udfd.c
index cfbffa4606..0ee14f7820 100644
--- a/source/libs/function/src/udfd.c
+++ b/source/libs/function/src/udfd.c
@@ -531,12 +531,14 @@ void udfdDeinitScriptPlugins() {
   if (plugin != NULL) {
     udfdDeinitPythonPlugin(plugin);
     taosMemoryFree(plugin);
+    global.scriptPlugins[TSDB_FUNC_SCRIPT_PYTHON] = NULL;
   }
 
   plugin = global.scriptPlugins[TSDB_FUNC_SCRIPT_BIN_LIB];
   if (plugin != NULL) {
     udfdDeinitCPlugin(plugin);
     taosMemoryFree(plugin);
+    global.scriptPlugins[TSDB_FUNC_SCRIPT_BIN_LIB] = NULL;
   }
   return;
 }
@@ -551,7 +553,7 @@ void udfdProcessRequest(uv_work_t *req) {
   SUdfRequest request = {0};
   if(decodeUdfRequest(uvUdf->input.base, &request) == NULL)
   {
-    taosMemoryFree(uvUdf->input.base);
+    taosMemoryFreeClear(uvUdf->input.base);
     fnError("udf request decode failed");
     return;
   }
@@ -783,7 +785,7 @@ _send:
   
   uvUdf->output = uv_buf_init(bufBegin, len);
 
-  taosMemoryFree(uvUdf->input.base);
+  taosMemoryFreeClear(uvUdf->input.base);
   return;
 }
 
@@ -969,7 +971,7 @@ _exit:
       break;
   }
 
-  taosMemoryFree(uvUdf->input.base);
+  taosMemoryFreeClear(uvUdf->input.base);
   return;
 }
 
@@ -1668,7 +1670,7 @@ static void udfdGlobalDataDeinit() {
   taosHashCleanup(global.udfsHash);
   uv_mutex_destroy(&global.udfsMutex);
   uv_mutex_destroy(&global.scriptPluginsMutex);
-  taosMemoryFree(global.loop);
+  taosMemoryFreeClear(global.loop);
   fnInfo("udfd global data deinit");
 }
 
diff --git a/source/libs/qcom/src/queryUtil.c b/source/libs/qcom/src/queryUtil.c
index 847fc9b8e9..15dcbafd19 100644
--- a/source/libs/qcom/src/queryUtil.c
+++ b/source/libs/qcom/src/queryUtil.c
@@ -674,6 +674,7 @@ int32_t cloneSVreateTbReq(SVCreateTbReq* pSrc, SVCreateTbReq** pDst) {
 _exit:
   tdDestroySVCreateTbReq(*pDst);
   taosMemoryFree(*pDst);
+  *pDst = NULL;
   return terrno;
 }