diff --git a/source/client/src/clientEnv.c b/source/client/src/clientEnv.c
index fec1060042..53be1fccf4 100644
--- a/source/client/src/clientEnv.c
+++ b/source/client/src/clientEnv.c
@@ -552,6 +552,9 @@ int32_t createRequest(uint64_t connId, int32_t type, int64_t reqid, SRequestObj
   (*pRequest)->allocatorRefId = -1;
 
   (*pRequest)->pDb = getDbOfConnection(pTscObj);
+  if (NULL == (*pRequest)->pDb) {
+    TSC_ERR_JRET(terrno);
+  }
   (*pRequest)->pTscObj = pTscObj;
   (*pRequest)->inCallback = false;
   (*pRequest)->msgBuf = taosMemoryCalloc(1, ERROR_MSG_BUF_DEFAULT_SIZE);
diff --git a/source/client/src/clientHb.c b/source/client/src/clientHb.c
index 82ebb5a9fd..6ee6d753e4 100644
--- a/source/client/src/clientHb.c
+++ b/source/client/src/clientHb.c
@@ -1359,6 +1359,14 @@ static void *hbThreadFunc(void *param) {
       pInfo->msgInfo.len = tlen;
       pInfo->msgType = TDMT_MND_HEARTBEAT;
       pInfo->param = taosMemoryMalloc(sizeof(int32_t));
+      if (pInfo->param  == NULL) {
+        terrno = TSDB_CODE_OUT_OF_MEMORY;
+        tFreeClientHbBatchReq(pReq);
+        // hbClearReqInfo(pAppHbMgr);
+        taosMemoryFree(buf);
+        taosMemoryFree(pInfo);
+        break;
+      }
       *(int32_t *)pInfo->param = i;
       pInfo->paramFreeFp = taosMemoryFree;
       pInfo->requestId = generateRequestId();
diff --git a/source/client/src/clientImpl.c b/source/client/src/clientImpl.c
index 2a5266b7ed..3b61644a6c 100644
--- a/source/client/src/clientImpl.c
+++ b/source/client/src/clientImpl.c
@@ -1586,6 +1586,8 @@ int32_t taosConnectImpl(const char* user, const char* auth, const char* db, __ta
   pRequest->sqlstr = taosStrdup("taos_connect");
   if (pRequest->sqlstr) {
     pRequest->sqlLen = strlen(pRequest->sqlstr);
+  } else {
+    return terrno;
   }
 
   SMsgSendInfo* body = NULL;
@@ -1649,6 +1651,9 @@ static int32_t buildConnectMsg(SRequestObj* pRequest, SMsgSendInfo** pMsgSendInf
   char* db = getDbOfConnection(pObj);
   if (db != NULL) {
     tstrncpy(connectReq.db, db, sizeof(connectReq.db));
+  } else if (terrno) {
+    taosMemoryFree(*pMsgSendInfo);
+    return terrno;
   }
   taosMemoryFreeClear(db);
 
@@ -2396,11 +2401,16 @@ int32_t setResultDataPtr(SReqResultInfo* pResultInfo, TAOS_FIELD* pFields, int32
 }
 
 char* getDbOfConnection(STscObj* pObj) {
+  terrno = TSDB_CODE_SUCCESS;
   char* p = NULL;
   (void)taosThreadMutexLock(&pObj->mutex);
   size_t len = strlen(pObj->db);
   if (len > 0) {
     p = strndup(pObj->db, tListLen(pObj->db));
+    if (p == NULL) {
+      tscError("failed to strndup db name");
+      terrno = TSDB_CODE_OUT_OF_MEMORY;
+    }
   }
 
   (void)taosThreadMutexUnlock(&pObj->mutex);
diff --git a/source/libs/function/src/builtinsimpl.c b/source/libs/function/src/builtinsimpl.c
index 5fc257db5b..87e6030898 100644
--- a/source/libs/function/src/builtinsimpl.c
+++ b/source/libs/function/src/builtinsimpl.c
@@ -4828,6 +4828,9 @@ int32_t histogramFunctionSetup(SqlFunctionCtx* pCtx, SResultRowEntryInfo* pResul
   pInfo->normalized = 0;
 
   char*  binTypeStr = strndup(varDataVal(pCtx->param[1].param.pz), varDataLen(pCtx->param[1].param.pz));
+  if (binTypeStr == NULL) {
+    return TSDB_CODE_OUT_OF_MEMORY;
+  }
   int8_t binType = getHistogramBinType(binTypeStr);
   taosMemoryFree(binTypeStr);
 
@@ -4835,6 +4838,9 @@ int32_t histogramFunctionSetup(SqlFunctionCtx* pCtx, SResultRowEntryInfo* pResul
     return TSDB_CODE_FUNC_FUNTION_PARA_VALUE;
   }
   char*   binDesc = strndup(varDataVal(pCtx->param[2].param.pz), varDataLen(pCtx->param[2].param.pz));
+  if (binDesc == NULL) {
+    return TSDB_CODE_OUT_OF_MEMORY;
+  }
   int64_t normalized = pCtx->param[3].param.i;
   if (normalized != 0 && normalized != 1) {
     taosMemoryFree(binDesc);
diff --git a/source/libs/function/src/thistogram.c b/source/libs/function/src/thistogram.c
index 6dfad36542..2283845cfb 100644
--- a/source/libs/function/src/thistogram.c
+++ b/source/libs/function/src/thistogram.c
@@ -43,6 +43,10 @@ int32_t tHistogramCreate(int32_t numOfEntries, SHistogramInfo** pHisto) {
 #if !defined(USE_ARRAYLIST)
   pHisto->pList = SSkipListCreate(MAX_SKIP_LIST_LEVEL, TSDB_DATA_TYPE_DOUBLE, sizeof(double));
   SInsertSupporter* pss = taosMemoryMalloc(sizeof(SInsertSupporter));
+  if (NULL == pss) {
+    taosMemoryFree(*pHisto);
+    return terrno;
+  }
   pss->numOfEntries = pHisto->maxEntries;
   pss->pSkipList = pHisto->pList;
 
@@ -119,6 +123,9 @@ int32_t tHistogramAdd(SHistogramInfo** pHisto, double val) {
 #else
   tSkipListKey key = tSkipListCreateKey(TSDB_DATA_TYPE_DOUBLE, &val, tDataTypes[TSDB_DATA_TYPE_DOUBLE].nSize);
   SHistBin*    entry = taosMemoryCalloc(1, sizeof(SHistBin));
+  if (entry == NULL) {
+    return terrno;
+  }
   entry->val = val;
 
   tSkipListNode* pResNode = SSkipListPut((*pHisto)->pList, entry, &key, 0);
diff --git a/source/libs/scalar/src/sclfunc.c b/source/libs/scalar/src/sclfunc.c
index 3b9cad68ad..965e029c8f 100644
--- a/source/libs/scalar/src/sclfunc.c
+++ b/source/libs/scalar/src/sclfunc.c
@@ -4353,10 +4353,16 @@ int32_t histogramScalarFunction(SScalarParam *pInput, int32_t inputNum, SScalarP
   int32_t        totalCount = 0;
 
   char *binTypeStr = strndup(varDataVal(pInput[1].columnData->pData), varDataLen(pInput[1].columnData->pData));
+  if (NULL == binTypeStr) {
+    SCL_ERR_RET(TSDB_CODE_OUT_OF_MEMORY);
+  }
   int8_t binType = getHistogramBinType(binTypeStr);
   taosMemoryFree(binTypeStr);
 
   char   *binDesc = strndup(varDataVal(pInput[2].columnData->pData), varDataLen(pInput[2].columnData->pData));
+  if (NULL == binDesc) {
+    SCL_ERR_RET(TSDB_CODE_OUT_OF_MEMORY);
+  }
   int64_t normalized = *(int64_t *)(pInput[3].columnData->pData);
 
   int32_t type = GET_PARAM_TYPE(pInput);
diff --git a/source/libs/scalar/src/sclvector.c b/source/libs/scalar/src/sclvector.c
index d8cc620b1e..2bfad71ddb 100644
--- a/source/libs/scalar/src/sclvector.c
+++ b/source/libs/scalar/src/sclvector.c
@@ -596,6 +596,11 @@ int32_t ncharTobinary(void *buf, void **out) {  // todo need to remove , if tobi
   int32_t inputLen = varDataTLen(buf);
 
   *out = taosMemoryCalloc(1, inputLen);
+  if (NULL == *out) {
+    sclError("charset:%s to %s. val:%s convert ncharTobinary failed, since memory alloc failed.",
+             DEFAULT_UNICODE_ENCODEC, tsCharset, (char *)varDataVal(buf));
+    SCL_ERR_RET(terrno);
+  }
   int32_t len = taosUcs4ToMbs((TdUcs4 *)varDataVal(buf), varDataLen(buf), varDataVal(*out));
   if (len < 0) {
     sclError("charset:%s to %s. val:%s convert ncharTobinary failed.", DEFAULT_UNICODE_ENCODEC, tsCharset,