diff --git a/src/client/src/tscLocal.c b/src/client/src/tscLocal.c
index f550bbd000bc894a20b00a4d6195059a478c3da3..eaf9c21bfbf667e8e16f16857afb118f87fada8a 100644
--- a/src/client/src/tscLocal.c
+++ b/src/client/src/tscLocal.c
@@ -279,7 +279,8 @@ static void tscProcessCurrentUser(SSqlObj *pSql) {
   pExpr->resType = TSDB_DATA_TYPE_BINARY;
   
   char* vx = calloc(1, pExpr->resBytes);
-  STR_WITH_MAXSIZE_TO_VARSTR(vx, pSql->pTscObj->user, sizeof(pSql->pTscObj->user));
+  size_t size = sizeof(pSql->pTscObj->user);
+  STR_WITH_MAXSIZE_TO_VARSTR(vx, pSql->pTscObj->user, size);
   
   tscSetLocalQueryResult(pSql, vx, pExpr->aliasName, pExpr->resType, pExpr->resBytes);
   free(vx);
diff --git a/src/client/src/tscServer.c b/src/client/src/tscServer.c
index 2a102a2eccb7980ad497802b93b6da5f30c38c70..8e87e8fd7a2b6cd513cd405a38adbeff534c1819 100644
--- a/src/client/src/tscServer.c
+++ b/src/client/src/tscServer.c
@@ -1708,8 +1708,9 @@ int tscBuildSTableVgroupMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
   
   for(int32_t i = 0; i < pQueryInfo->numOfTables; ++i) {
     STableMetaInfo *pTableMetaInfo = tscGetTableMetaInfoFromCmd(pCmd, pCmd->clauseIndex, i);
-    tstrncpy(pMsg, pTableMetaInfo->name, sizeof(pTableMetaInfo->name));
-    pMsg += sizeof(pTableMetaInfo->name);
+    size_t size = sizeof(pTableMetaInfo->name);
+    tstrncpy(pMsg, pTableMetaInfo->name, size);
+    pMsg += size;
   }
 
   pCmd->msgType = TSDB_MSG_TYPE_CM_STABLE_VGROUP;
diff --git a/src/mnode/src/mnodeProfile.c b/src/mnode/src/mnodeProfile.c
index 5b637d03bd48bc99e80208899b43f92c2bc1d8d2..4720fb0ddca703e936cacc4bbfab647ed812e31c 100644
--- a/src/mnode/src/mnodeProfile.c
+++ b/src/mnode/src/mnodeProfile.c
@@ -235,12 +235,14 @@ static int32_t mnodeRetrieveConns(SShowObj *pShow, char *data, int32_t rows, voi
     cols++;
 
     pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
-    STR_WITH_MAXSIZE_TO_VARSTR(pWrite, pConnObj->user, sizeof(pConnObj->user));
+    size_t size = sizeof(pConnObj->user);
+    STR_WITH_MAXSIZE_TO_VARSTR(pWrite, pConnObj->user, size);
     cols++;
 
     pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
     snprintf(ipStr, sizeof(ipStr), "%s:%u", taosIpStr(pConnObj->ip), pConnObj->port);
-    STR_WITH_MAXSIZE_TO_VARSTR(pWrite, ipStr, sizeof(ipStr));
+    size = sizeof(ipStr);
+    STR_WITH_MAXSIZE_TO_VARSTR(pWrite, ipStr, size);
     cols++;
 
     pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
@@ -358,12 +360,14 @@ static int32_t mnodeRetrieveQueries(SShowObj *pShow, char *data, int32_t rows, v
       cols++;
 
       pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
-      STR_WITH_MAXSIZE_TO_VARSTR(pWrite, pConnObj->user, sizeof(pConnObj->user));
+      size_t size = sizeof(pConnObj->user);
+      STR_WITH_MAXSIZE_TO_VARSTR(pWrite, pConnObj->user, size);
       cols++;
 
       pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
       snprintf(ipStr, sizeof(ipStr), "%s:%u", taosIpStr(pConnObj->ip), pConnObj->port);
-      STR_WITH_MAXSIZE_TO_VARSTR(pWrite, ipStr, sizeof(ipStr));
+      size = sizeof(ipStr);
+      STR_WITH_MAXSIZE_TO_VARSTR(pWrite, ipStr, size);
       cols++;
 
       pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
@@ -479,12 +483,14 @@ static int32_t mnodeRetrieveStreams(SShowObj *pShow, char *data, int32_t rows, v
       cols++;
 
       pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
-      STR_WITH_MAXSIZE_TO_VARSTR(pWrite, pConnObj->user, sizeof(pConnObj->user));
+      size_t size = sizeof(pConnObj->user);
+      STR_WITH_MAXSIZE_TO_VARSTR(pWrite, pConnObj->user, size);
       cols++;
 
       pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
       snprintf(ipStr, sizeof(ipStr), "%s:%u", taosIpStr(pConnObj->ip), pConnObj->port);
-      STR_WITH_MAXSIZE_TO_VARSTR(pWrite, ipStr, sizeof(ipStr));
+      size = sizeof(ipStr);
+      STR_WITH_MAXSIZE_TO_VARSTR(pWrite, ipStr, size);
       cols++;
 
       pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
diff --git a/src/mnode/src/mnodeTable.c b/src/mnode/src/mnodeTable.c
index 89ac4b6cc4e6aa0da55994737e3a4be3d3ec6206..0e255d011b621cd4785c463bac5eea5ef67794af 100644
--- a/src/mnode/src/mnodeTable.c
+++ b/src/mnode/src/mnodeTable.c
@@ -1770,7 +1770,8 @@ static int32_t mnodeAutoCreateChildTable(SMnodeMsg *pMsg) {
     return TSDB_CODE_MND_OUT_OF_MEMORY;
   }
 
-  tstrncpy(pCreateMsg->tableId, pInfo->tableId, sizeof(pInfo->tableId));
+  size_t size = sizeof(pInfo->tableId);
+  tstrncpy(pCreateMsg->tableId, pInfo->tableId, size);
   tstrncpy(pCreateMsg->db, pMsg->pDb->name, sizeof(pCreateMsg->db));
   pCreateMsg->igExists = 1;
   pCreateMsg->getMeta = 1;
diff --git a/src/mnode/src/mnodeUser.c b/src/mnode/src/mnodeUser.c
index ee79d962bad8fd86483518af6fec2dba3532d479..95457c83a0c81871955df2ac0b729171dcc5a2ae 100644
--- a/src/mnode/src/mnodeUser.c
+++ b/src/mnode/src/mnodeUser.c
@@ -315,7 +315,8 @@ static int32_t mnodeRetrieveUsers(SShowObj *pShow, char *data, int32_t rows, voi
     cols = 0;
 
     pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
-    STR_WITH_MAXSIZE_TO_VARSTR(pWrite, pUser->user, sizeof(pUser->user));
+    size_t size = sizeof(pUser->user);
+    STR_WITH_MAXSIZE_TO_VARSTR(pWrite, pUser->user, size);
     cols++;
 
     pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
diff --git a/src/plugins/http/src/httpAuth.c b/src/plugins/http/src/httpAuth.c
index 61ca5b4cc9f37a3801e5bac77f64ce29feb06168..cf2ce5ddd9274e8a7d1908f6c410c7ef629055b8 100644
--- a/src/plugins/http/src/httpAuth.c
+++ b/src/plugins/http/src/httpAuth.c
@@ -101,8 +101,10 @@ bool httpParseTaosdAuthToken(HttpContext *pContext, char *token, int len) {
 
 bool httpGenTaosdAuthToken(HttpContext *pContext, char *token, int maxLen) {
   char buffer[sizeof(pContext->user) + sizeof(pContext->pass)] = {0};
-  tstrncpy(buffer, pContext->user, sizeof(pContext->user));
-  tstrncpy(buffer + sizeof(pContext->user), pContext->pass, sizeof(pContext->pass));
+  size_t size = sizeof(pContext->user);
+  tstrncpy(buffer, pContext->user, size);
+  size = sizeof(pContext->pass);
+  tstrncpy(buffer + sizeof(pContext->user), pContext->pass, size);
 
   char *encrypt = taosDesEncode(KEY_DES_4, buffer, TSDB_USER_LEN + TSDB_PASSWORD_LEN);
   char *base64 = base64_encode((const unsigned char *)encrypt, TSDB_USER_LEN + TSDB_PASSWORD_LEN);