diff --git a/source/dnode/mnode/impl/src/mndConfig.c b/source/dnode/mnode/impl/src/mndConfig.c
index 563c14411d..e861f1c0e8 100644
--- a/source/dnode/mnode/impl/src/mndConfig.c
+++ b/source/dnode/mnode/impl/src/mndConfig.c
@@ -66,6 +66,7 @@ int32_t taosGetConfigObjSize(SConfigObj *obj) {
   if (obj->dtype == CFG_DTYPE_STRING || obj->dtype == CFG_DTYPE_DIR || obj->dtype == CFG_DTYPE_LOCALE ||
       obj->dtype == CFG_DTYPE_CHARSET || obj->dtype == CFG_DTYPE_TIMEZONE) {
     if (obj->str != NULL) {
+      size += sizeof(int32_t);
       size += strlen(obj->str) + 1;
     }
   }
diff --git a/source/dnode/mnode/impl/src/mndDef.c b/source/dnode/mnode/impl/src/mndDef.c
index 0ed136e35b..3741a8bae0 100644
--- a/source/dnode/mnode/impl/src/mndDef.c
+++ b/source/dnode/mnode/impl/src/mndDef.c
@@ -758,7 +758,7 @@ SConfigObj *mndInitConfigObj(SConfigItem *pItem) {
     case CFG_DTYPE_LOCALE:
     case CFG_DTYPE_CHARSET:
     case CFG_DTYPE_TIMEZONE:
-      pObj->str = pItem->str;
+      pObj->str = taosStrdup(pItem->str);
       break;
   }
   return pObj;
diff --git a/source/dnode/mnode/impl/src/mndDnode.c b/source/dnode/mnode/impl/src/mndDnode.c
index da9b50e934..dfe0c1e933 100644
--- a/source/dnode/mnode/impl/src/mndDnode.c
+++ b/source/dnode/mnode/impl/src/mndDnode.c
@@ -1145,7 +1145,10 @@ SArray *initVariablesFromItems(SArray *pItems) {
         strcpy(info.category, "unknown");
         break;
     }
-    taosArrayPush(pInfos, &info);
+    if (NULL == taosArrayPush(pInfos, &info)) {
+      mError("failed to push info to array while init variables from items,since %s", tstrerror(terrno));
+      return NULL;
+    }
   }
 
   return pInfos;