From 3cb6101dd40d678998b871cd90bc7378d5ff9b77 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ren=C3=A9=20Canna=C3=B2?= <rene.cannao@gmail.com>
Date: Mon, 7 Nov 2016 09:22:30 +0000
Subject: [PATCH] Validate mysql on mysql_stmt_free_result #779

Calling mysql_stmt_free_result() on a statement without a valid pointer to mysql was leading to a crash
---
 lib/mysql_connection.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/mysql_connection.cpp b/lib/mysql_connection.cpp
index be322edae..89175df7f 100644
--- a/lib/mysql_connection.cpp
+++ b/lib/mysql_connection.cpp
@@ -1377,7 +1377,9 @@ void MySQL_Connection::async_free_result() {
 		query.stmt_result=NULL;
 	}
 	if (query.stmt) {
-		mysql_stmt_free_result(query.stmt);
+		if (query.stmt->mysql) {
+			mysql_stmt_free_result(query.stmt);
+		}
 	}
 	if (mysql_result) {
 		mysql_free_result(mysql_result);