diff --git a/src/mnode/src/mnodeSdb.c b/src/mnode/src/mnodeSdb.c
index 601745461a8ba3486bfb9dc560c76e303153eab5..e1d255ee76ee9140ee5a9a071582d73fa67b272d 100644
--- a/src/mnode/src/mnodeSdb.c
+++ b/src/mnode/src/mnodeSdb.c
@@ -287,7 +287,7 @@ void sdbUpdateSync() {
       SDnodeObj *pDnode = mnodeGetDnode(pMnode->mnodeId);
       if (pDnode != NULL) {
         syncCfg.nodeInfo[index].nodePort = pDnode->dnodePort + TSDB_PORT_SYNC;
-        strcpy(syncCfg.nodeInfo[index].nodeFqdn, pDnode->dnodeEp);
+        tstrncpy(syncCfg.nodeInfo[index].nodeFqdn, pDnode->dnodeFqdn, TSDB_FQDN_LEN);
         index++;
       }
 
@@ -976,11 +976,11 @@ static void *sdbWorkerFp(void *param) {
                    tstrerror(pOper->retCode));
         }
 
-        dnodeSendRpcMnodeWriteRsp(pOper->pMsg, pOper->retCode);
-
         if (pOper != NULL) {
           sdbDecRef(pOper->table, pOper->pObj);
         }
+
+        dnodeSendRpcMnodeWriteRsp(pOper->pMsg, pOper->retCode);
       }
       taosFreeQitem(item);
     }
diff --git a/src/mnode/src/mnodeTable.c b/src/mnode/src/mnodeTable.c
index 023ae689198a89530895f343635111f5c9f7a3dd..2d9892cf017f0674d6a944af12641633d84f1b68 100644
--- a/src/mnode/src/mnodeTable.c
+++ b/src/mnode/src/mnodeTable.c
@@ -1254,13 +1254,13 @@ int32_t mnodeRetrieveShowSuperTables(SShowObj *pShow, char *data, int32_t rows,
   char *          pWrite;
   int32_t         cols = 0;
   SSuperTableObj *pTable = NULL;
-  char            prefix[20] = {0};
+  char            prefix[64] = {0};
   int32_t         prefixLen;
 
   SDbObj *pDb = mnodeGetDb(pShow->db);
   if (pDb == NULL) return 0;
 
-  strcpy(prefix, pDb->name);
+  tstrncpy(prefix, pDb->name, 64);
   strcat(prefix, TS_PATH_DELIMITER);
   prefixLen = strlen(prefix);
 
@@ -1558,10 +1558,10 @@ static void *mnodeBuildCreateChildTableMsg(SCMCreateTableMsg *pMsg, SChildTableO
 
 static int32_t mnodeDoCreateChildTableCb(SMnodeMsg *pMsg, int32_t code) {
   SChildTableObj *pTable = (SChildTableObj *)pMsg->pTable;
-  if (pTable != NULL) {
-    mDebug("app:%p:%p, table:%s, create table in id:%d, uid:%" PRIu64 ", result:%s", pMsg->rpcMsg.ahandle, pMsg,
-           pTable->info.tableId, pTable->sid, pTable->uid, tstrerror(code));
-  }
+  assert(pTable);
+
+  mDebug("app:%p:%p, table:%s, create table in id:%d, uid:%" PRIu64 ", result:%s", pMsg->rpcMsg.ahandle, pMsg,
+         pTable->info.tableId, pTable->sid, pTable->uid, tstrerror(code));
 
   if (code != TSDB_CODE_SUCCESS) return code;
 
@@ -2370,7 +2370,7 @@ static int32_t mnodeRetrieveShowTables(SShowObj *pShow, char *data, int32_t rows
   SPatternCompareInfo info = PATTERN_COMPARE_INFO_INITIALIZER;
 
   char prefix[64] = {0};
-  strcpy(prefix, pDb->name);
+  tstrncpy(prefix, pDb->name, 64);
   strcat(prefix, TS_PATH_DELIMITER);
   int32_t prefixLen = strlen(prefix);
 
@@ -2560,7 +2560,7 @@ static int32_t mnodeRetrieveStreamTables(SShowObj *pShow, char *data, int32_t ro
   SPatternCompareInfo info = PATTERN_COMPARE_INFO_INITIALIZER;
 
   char prefix[64] = {0};
-  strcpy(prefix, pDb->name);
+  tstrncpy(prefix, pDb->name, 64);
   strcat(prefix, TS_PATH_DELIMITER);
   int32_t prefixLen = strlen(prefix);
 
diff --git a/src/vnode/src/vnodeMain.c b/src/vnode/src/vnodeMain.c
index 89af7b988d603a211261c1a556820dd44e1b77b6..4693dc02d3c57fd13d6026e319e7a99ef1fc7a8f 100644
--- a/src/vnode/src/vnodeMain.c
+++ b/src/vnode/src/vnodeMain.c
@@ -601,10 +601,11 @@ static int32_t vnodeReadCfg(SVnodeObj *pVnode) {
 
   content = calloc(1, maxLen + 1);
   if (content == NULL) goto PARSE_OVER;
-  int   len = fread(content, 1, maxLen, fp);
+  int len = fread(content, 1, maxLen, fp);
   if (len <= 0) {
     vError("vgId:%d, failed to read vnode cfg, content is null", pVnode->vgId);
     free(content);
+    fclose(fp);
     return errno;
   }
 
@@ -649,7 +650,7 @@ static int32_t vnodeReadCfg(SVnodeObj *pVnode) {
   }
   pVnode->tsdbCfg.maxTables = maxTables->valueint;
 
-   cJSON *daysPerFile = cJSON_GetObjectItem(root, "daysPerFile");
+  cJSON *daysPerFile = cJSON_GetObjectItem(root, "daysPerFile");
   if (!daysPerFile || daysPerFile->type != cJSON_Number) {
     vError("vgId:%d, failed to read vnode cfg, daysPerFile not found", pVnode->vgId);
     goto PARSE_OVER;