From 76c2993e905992688f446cf0e859047ece8c7fc6 Mon Sep 17 00:00:00 2001
From: dapan1121 <89396746@qq.com>
Date: Fri, 11 Jun 2021 16:16:05 +0800
Subject: [PATCH] add null pointer check

---
 src/client/src/tscPrepare.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/client/src/tscPrepare.c b/src/client/src/tscPrepare.c
index 3f12bc811b..b6d1f7f17b 100644
--- a/src/client/src/tscPrepare.c
+++ b/src/client/src/tscPrepare.c
@@ -1462,6 +1462,11 @@ int taos_stmt_prepare(TAOS_STMT* stmt, const char* sql, unsigned long length) {
     STMT_RET(TSDB_CODE_TSC_DISCONNECTED);
   }
 
+  if (sql == NULL) {
+    tscError("sql is NULL");
+    STMT_RET(invalidOperationMsg(tscGetErrorMsgPayload(&pStmt->pSql->cmd), "sql is NULL"));
+  }
+  
   if (pStmt->last != STMT_INIT) {
     tscError("prepare status error, last:%d", pStmt->last);
     STMT_RET(invalidOperationMsg(tscGetErrorMsgPayload(&pStmt->pSql->cmd), "prepare status error"));
-- 
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