From 3afe4cc45899d61dd0436116f9fdecbadc341796 Mon Sep 17 00:00:00 2001
From: Hongze Cheng <hzcheng@taosdata.com>
Date: Wed, 1 Jul 2020 18:58:22 +0800
Subject: [PATCH] fix invalid read

---
 src/query/src/qExecutor.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/query/src/qExecutor.c b/src/query/src/qExecutor.c
index c8207cb986..f33d739ba1 100644
--- a/src/query/src/qExecutor.c
+++ b/src/query/src/qExecutor.c
@@ -6032,12 +6032,15 @@ void qDestroyQueryInfo(qinfo_t qHandle) {
   qDebug("QInfo:%p dec refCount, value:%d", pQInfo, ref);
 
   if (ref == 0) {
-    if (pQInfo->fn != NULL) {
-      assert(pQInfo->param != NULL);
-      pQInfo->fn(pQInfo->param);
-    }
+    _qinfo_free_fn_t fn = pQInfo->fn;
+    void* param = pQInfo->param;
 
     doDestoryQueryInfo(pQInfo);
+    if (fn != NULL) {
+      assert(param != NULL);
+      fn(param);
+    }
+
   }
 }