diff --git a/source/dnode/mnode/impl/src/mndUser.c b/source/dnode/mnode/impl/src/mndUser.c
index 3a1c4ce58f23cc951bf4ab41014eb89bde443d8b..d08227927aae2d0d6fd2443df36650e8445a08f8 100644
--- a/source/dnode/mnode/impl/src/mndUser.c
+++ b/source/dnode/mnode/impl/src/mndUser.c
@@ -1168,15 +1168,13 @@ static void mndLoopHash(SHashObj *hash, char *priType, SSDataBlock *pBlock, int3
         sprintf(sql, "error");
       }
 
-      // char *obj = taosMemoryMalloc(sqlLen + VARSTR_HEADER_SIZE + 1);
       char obj[TSDB_PRIVILEDGE_CONDITION_LEN + VARSTR_HEADER_SIZE] = {0};
       STR_WITH_MAXSIZE_TO_VARSTR(obj, sql, pShow->pMeta->pSchemas[cols].bytes);
 
       pColInfo = taosArrayGet(pBlock->pDataBlock, cols++);
       colDataSetVal(pColInfo, *numOfRows, (const char *)obj, false);
-      // taosMemoryFree(obj);
     } else {
-      char condition[20] = {0};
+      char condition[TSDB_PRIVILEDGE_CONDITION_LEN + VARSTR_HEADER_SIZE] = {0};
       STR_WITH_MAXSIZE_TO_VARSTR(condition, "", pShow->pMeta->pSchemas[cols].bytes);
       pColInfo = taosArrayGet(pBlock->pDataBlock, cols++);
       colDataSetVal(pColInfo, *numOfRows, (const char *)condition, false);
@@ -1257,12 +1255,12 @@ static int32_t mndRetrievePrivileges(SRpcMsg *pReq, SShowObj *pShow, SSDataBlock
       pColInfo = taosArrayGet(pBlock->pDataBlock, cols++);
       colDataSetVal(pColInfo, numOfRows, (const char *)objName, false);
 
-      char tableName[20] = {0};
+      char tableName[TSDB_TABLE_NAME_LEN + VARSTR_HEADER_SIZE] = {0};
       STR_WITH_MAXSIZE_TO_VARSTR(tableName, "", pShow->pMeta->pSchemas[cols].bytes);
       pColInfo = taosArrayGet(pBlock->pDataBlock, cols++);
       colDataSetVal(pColInfo, numOfRows, (const char *)tableName, false);
 
-      char condition[20] = {0};
+      char condition[TSDB_PRIVILEDGE_CONDITION_LEN + VARSTR_HEADER_SIZE] = {0};
       STR_WITH_MAXSIZE_TO_VARSTR(condition, "", pShow->pMeta->pSchemas[cols].bytes);
       pColInfo = taosArrayGet(pBlock->pDataBlock, cols++);
       colDataSetVal(pColInfo, numOfRows, (const char *)condition, false);
@@ -1292,12 +1290,12 @@ static int32_t mndRetrievePrivileges(SRpcMsg *pReq, SShowObj *pShow, SSDataBlock
       pColInfo = taosArrayGet(pBlock->pDataBlock, cols++);
       colDataSetVal(pColInfo, numOfRows, (const char *)objName, false);
 
-      char tableName[20] = {0};
+      char tableName[TSDB_TABLE_NAME_LEN + VARSTR_HEADER_SIZE] = {0};
       STR_WITH_MAXSIZE_TO_VARSTR(tableName, "", pShow->pMeta->pSchemas[cols].bytes);
       pColInfo = taosArrayGet(pBlock->pDataBlock, cols++);
       colDataSetVal(pColInfo, numOfRows, (const char *)tableName, false);
 
-      char condition[20] = {0};
+      char condition[TSDB_PRIVILEDGE_CONDITION_LEN + VARSTR_HEADER_SIZE] = {0};
       STR_WITH_MAXSIZE_TO_VARSTR(condition, "", pShow->pMeta->pSchemas[cols].bytes);
       pColInfo = taosArrayGet(pBlock->pDataBlock, cols++);
       colDataSetVal(pColInfo, numOfRows, (const char *)condition, false);
@@ -1329,12 +1327,12 @@ static int32_t mndRetrievePrivileges(SRpcMsg *pReq, SShowObj *pShow, SSDataBlock
       pColInfo = taosArrayGet(pBlock->pDataBlock, cols++);
       colDataSetVal(pColInfo, numOfRows, (const char *)topicName, false);
 
-      char tableName[20] = {0};
+      char tableName[TSDB_TABLE_NAME_LEN + VARSTR_HEADER_SIZE] = {0};
       STR_WITH_MAXSIZE_TO_VARSTR(tableName, "", pShow->pMeta->pSchemas[cols].bytes);
       pColInfo = taosArrayGet(pBlock->pDataBlock, cols++);
       colDataSetVal(pColInfo, numOfRows, (const char *)tableName, false);
 
-      char condition[20] = {0};
+      char condition[TSDB_PRIVILEDGE_CONDITION_LEN + VARSTR_HEADER_SIZE] = {0};
       STR_WITH_MAXSIZE_TO_VARSTR(condition, "", pShow->pMeta->pSchemas[cols].bytes);
       pColInfo = taosArrayGet(pBlock->pDataBlock, cols++);
       colDataSetVal(pColInfo, numOfRows, (const char *)condition, false);