fix crash due to a dangling pointer

src/race/grand_prix_manager.cpp

@@ -27,10 +27,30 @@
 #include <set>
 #include <sstream>
 
+#include <iostream> // remove later
+
 GrandPrixManager *grand_prix_manager = NULL;
 
 const char* GrandPrixManager::SUFFIX = ".grandprix";
 
+// ----------------------------------------------------------------------------
+GrandPrixManager::GrandPrixManager()
+{
+    m_random_gp = NULL; // better do it explicitly and avoid weird stuff
+    loadFiles();
+}
+
+// ----------------------------------------------------------------------------
+GrandPrixManager::~GrandPrixManager()
+{
+    for(unsigned int i=0; i<m_gp_data.size(); i++)
+    {
+        delete m_gp_data[i];
+    }
+
+    delete m_random_gp;
+}
+
 // ----------------------------------------------------------------------------
 void GrandPrixManager::loadFiles()
 {
@@ -130,21 +150,6 @@ bool GrandPrixManager::existsName(const irr::core::stringw& name) const
     return false;
 }
 
-// ----------------------------------------------------------------------------
-GrandPrixManager::GrandPrixManager()
-{
-    loadFiles();
-}
-
-// ----------------------------------------------------------------------------
-GrandPrixManager::~GrandPrixManager()
-{
-    for(unsigned int i=0; i<m_gp_data.size(); i++)
-    {
-        delete m_gp_data[i];
-    }
-}
-
 // ----------------------------------------------------------------------------
 GrandPrixData* GrandPrixManager::getGrandPrix(const std::string& s) const
 {
@@ -154,6 +159,10 @@ GrandPrixData* GrandPrixManager::getGrandPrix(const std::string& s) const
 // ----------------------------------------------------------------------------
 GrandPrixData* GrandPrixManager::editGrandPrix(const std::string& s) const
 {
+    std::cout << s << std::endl;
+    if (s == "random")
+        return m_random_gp;
+
     for(unsigned int i=0; i<m_gp_data.size(); i++)
     {
         if(m_gp_data[i]->getId() == s)

src/race/grand_prix_manager.hpp

@@ -47,6 +47,10 @@ private:
     bool existsName(const irr::core::stringw& name) const;
 
 public:
+    /** saved here by a random GP dialog to avoid dangling pinters or
+     * memory leaks */
+    GrandPrixData* m_random_gp;
+
                    GrandPrixManager();
                   ~GrandPrixManager();
     void           reload();

src/states_screens/dialogs/random_gp_dialog.cpp

@@ -45,7 +45,14 @@ RandomGPInfoDialog::RandomGPInfoDialog()
     m_over_body = m_area.getHeight()/7 + SPINNER_HEIGHT + 10; // 10px space
     m_lower_bound = m_area.getHeight()*6/7;
 
+    // The GP manager is be used to make the GP live longer than this dialog
+    if (grand_prix_manager->m_random_gp)
+    {
+        delete grand_prix_manager->m_random_gp;
+        grand_prix_manager->m_random_gp = NULL;
+    }
     m_gp = new GrandPrixData(m_number_of_tracks, m_trackgroup, m_use_reverse);
+    grand_prix_manager->m_random_gp = m_gp;
 
     addTitle();
     addSpinners();
@@ -91,9 +98,8 @@ GUIEngine::EventPropagation RandomGPInfoDialog::processEvent(
     if (eventSource == "start")
     {
         // Save the gp since dismiss deletes it otherwise
-        GrandPrixData buff = *m_gp;
         ModalDialog::dismiss();
-        race_manager->startGP(&buff, false, false);
+        race_manager->startGP(m_gp, false, false);
         return GUIEngine::EVENT_BLOCK;
     }
     else if (eventSource == "Number of tracks")
@@ -132,10 +138,10 @@ GUIEngine::EventPropagation RandomGPInfoDialog::processEvent(
 
 void RandomGPInfoDialog::updateGP()
 {
-    if (m_gp != NULL)
-        delete m_gp;
+    delete m_gp;
 
     m_gp = new GrandPrixData(m_number_of_tracks, m_trackgroup, m_use_reverse);
+    grand_prix_manager->m_random_gp = m_gp;
     addTracks();
 }
 

src/states_screens/dialogs/random_gp_dialog.hpp

@@ -33,7 +33,6 @@ public:
     static const int SPINNER_HEIGHT = 40;
 
     RandomGPInfoDialog();
-    ~RandomGPInfoDialog() { delete m_gp; }
 
     /** Adds a SpinnerWidgets to choose the track groups and one to choose the
      * number of tracks */