Sql: Fix heap-user-after-free for globally initialized db objects

Becaues the database objects were created as globals, there was a
possible use-after-free issue when deleting the objects on application
exit.

Move the initialization of the database objects into static variables
inside the test constructor.

As a drive-by, also add one missing test to the CMake projects.

Fixes: QTBUG-85357
Change-Id: I2c8f2c5daee96bb9d1d21dae37950a2da5ffdf27
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>

tests/auto/sql/kernel/qsqlquery/tst_qsqlquery.cpp

@@ -33,7 +33,7 @@
 
 #include "../qsqldatabase/tst_databases.h"
 
-const QString qtest(qTableName("qtest", __FILE__, QSqlDatabase()));
+QString qtest;
 
 class tst_QSqlQuery : public QObject
 {
@@ -271,6 +271,8 @@ private:
 
 tst_QSqlQuery::tst_QSqlQuery()
 {
+    static QSqlDatabase static_qtest_db = QSqlDatabase();
+    qtest = qTableName("qtest", __FILE__, static_qtest_db);
 }
 
 tst_QSqlQuery::~tst_QSqlQuery()

tests/auto/sql/kernel/qsqlthread/tst_qsqlthread.cpp

@@ -36,7 +36,7 @@
 #include <QtSql>
 #include "qdebug.h"
 
-const QString qtest(qTableName("qtest", __FILE__, QSqlDatabase()));
+QString qtest;
 // set this define if Oracle is built with threading support
 //#define QOCI_THREADED
 
@@ -263,6 +263,8 @@ private:
 tst_QSqlThread::tst_QSqlThread()
     : threadFinishedCount(0)
 {
+    static QSqlDatabase static_qtest_db = QSqlDatabase();
+    qtest = qTableName("qtest", __FILE__, static_qtest_db);
 }
 
 tst_QSqlThread::~tst_QSqlThread()

tests/auto/sql/models/CMakeLists.txt

@@ -1,6 +1,8 @@
+# Generated from models.pro.
+
 add_subdirectory(qsqlrelationaltablemodel)
 add_subdirectory(qsqltablemodel)
-
 if(TARGET Qt::Widgets)
     add_subdirectory(qsqlquerymodel)
+    add_subdirectory(qsqlrelationaldelegate)
 endif()

tests/auto/sql/models/qsqlrelationaldelegate/tst_qsqlrelationaldelegate.cpp

@@ -34,8 +34,8 @@
 
 #include "../../kernel/qsqldatabase/tst_databases.h"
 
-const QString reltest1(qTableName("reltest1", __FILE__, QSqlDatabase())),
+QString reltest1;
-              reltest2(qTableName("reltest2", __FILE__, QSqlDatabase()));
+QString reltest2;
 
 class tst_QSqlRelationalDelegate : public QObject
 {
@@ -45,6 +45,7 @@ public:
     void recreateTestTables(QSqlDatabase);
 
     tst_Databases dbs;
+    tst_QSqlRelationalDelegate();
 
 public slots:
     void initTestCase_data();
@@ -59,6 +60,14 @@ private:
     void dropTestTables(QSqlDatabase db);
 };
 
+tst_QSqlRelationalDelegate::tst_QSqlRelationalDelegate()
+{
+    static QSqlDatabase static_qtest_db_1 = QSqlDatabase();
+    reltest1 = qTableName("reltest1", __FILE__, static_qtest_db_1);
+
+    static QSqlDatabase static_qtest_db_2 = QSqlDatabase();
+    reltest2 = qTableName("reltest2", __FILE__, static_qtest_db_2);
+}
 
 void tst_QSqlRelationalDelegate::initTestCase_data()
 {

tests/auto/sql/models/qsqlrelationaltablemodel/tst_qsqlrelationaltablemodel.cpp

@@ -32,11 +32,11 @@
 
 #include "../../kernel/qsqldatabase/tst_databases.h"
 
-const QString reltest1(qTableName("reltest1", __FILE__, QSqlDatabase())),
+QString reltest1;
-        reltest2(qTableName("reltest2", __FILE__, QSqlDatabase())),
+QString reltest2;
-        reltest3(qTableName("reltest3", __FILE__, QSqlDatabase())),
+QString reltest3;
-        reltest4(qTableName("reltest4", __FILE__, QSqlDatabase())),
+QString reltest4;
-        reltest5(qTableName("reltest5", __FILE__, QSqlDatabase()));
+QString reltest5;
 
 class tst_QSqlRelationalTableModel : public QObject
 {
@@ -44,6 +44,7 @@ class tst_QSqlRelationalTableModel : public QObject
 
 public:
     void recreateTestTables(QSqlDatabase);
+    tst_QSqlRelationalTableModel();
 
     tst_Databases dbs;
 
@@ -83,6 +84,23 @@ private:
     void dropTestTables( QSqlDatabase db );
 };
 
+tst_QSqlRelationalTableModel::tst_QSqlRelationalTableModel()
+{
+    static QSqlDatabase static_qtest_db_1 = QSqlDatabase();
+    reltest1 = qTableName("reltest1", __FILE__, static_qtest_db_1);
+
+    static QSqlDatabase static_qtest_db_2 = QSqlDatabase();
+    reltest2 = qTableName("reltest2", __FILE__, static_qtest_db_2);
+
+    static QSqlDatabase static_qtest_db_3 = QSqlDatabase();
+    reltest3 = qTableName("reltest3", __FILE__, static_qtest_db_3);
+
+    static QSqlDatabase static_qtest_db_4 = QSqlDatabase();
+    reltest4 = qTableName("reltest4", __FILE__, static_qtest_db_4);
+
+    static QSqlDatabase static_qtest_db_5 = QSqlDatabase();
+    reltest5 = qTableName("reltest5", __FILE__, static_qtest_db_5);
+}
 
 void tst_QSqlRelationalTableModel::initTestCase_data()
 {

tests/auto/sql/models/qsqltablemodel/tst_qsqltablemodel.cpp

@@ -34,9 +34,9 @@
 #include <QThread>
 #include <QElapsedTimer>
 
-const QString test(qTableName("test", __FILE__, QSqlDatabase())),
+QString test;
-                   test2(qTableName("test2", __FILE__, QSqlDatabase())),
+QString test2;
-                   test3(qTableName("test3", __FILE__, QSqlDatabase()));
+QString test3;
 
 // In order to catch when the warning message occurs, indicating that the database belongs to another
 // thread, we have to install our own message handler. To ensure that the test reporting still happens
@@ -164,6 +164,15 @@ private:
 
 tst_QSqlTableModel::tst_QSqlTableModel()
 {
+    static QSqlDatabase static_qtest_db_1 = QSqlDatabase();
+    test = qTableName("test1", __FILE__, static_qtest_db_1);
+
+    static QSqlDatabase static_qtest_db_2 = QSqlDatabase();
+    test2 = qTableName("test2", __FILE__, static_qtest_db_2);
+
+    static QSqlDatabase static_qtest_db_3 = QSqlDatabase();
+    test3 = qTableName("test3", __FILE__, static_qtest_db_3);
+
     QVERIFY(dbs.open());
 }