[client] overlay: clean up partial initialization

client/include/interface/overlay.h

@@ -38,7 +38,7 @@ struct LG_OverlayOps
   /* called when the overlay is registered */
   bool (*init)(void ** udata, const void * params);
 
-  /* final free */
+  /* final free; must be safe if init was not called or returned false */
   void (*free)(void * udata);
 
   /* return true if realtime rendering is required

client/src/app.c

@@ -858,8 +858,6 @@ void app_registerOverlay(const struct LG_OverlayOps * ops, const void * params)
     ops->earlyInit();
 }
 
-static bool l_overlaysInitialized = false;
-
 void app_initOverlays(void)
 {
   struct Overlay * overlay;
@@ -870,12 +868,12 @@ void app_initOverlays(void)
     if (!overlay->ops->init(&overlay->udata, overlay->params))
     {
       DEBUG_ERROR("Overlay `%s` failed to initialize", overlay->ops->name);
+      overlay->ops->free(overlay->udata);
       ll_removeNL(g_state.overlays, item);
       free(item);
       free(overlay);
     }
   }
-  l_overlaysInitialized = true;
   ll_unlock(g_state.overlays);
 
   /* Do not seed ImGui's clock with absolute host uptime. ImGui stores the
@@ -1071,11 +1069,9 @@ void app_freeOverlays(void)
   struct Overlay * overlay;
   while(ll_shift(g_state.overlays, (void **)&overlay))
   {
-    if (l_overlaysInitialized)
     overlay->ops->free(overlay->udata);
     free(overlay);
   }
-  l_overlaysInitialized = false;
 }
 
 void app_setOverlay(bool enable)

client/src/overlay/config.c

@@ -60,6 +60,9 @@ static bool config_init(void ** udata, const void * params)
 
 static void config_freeList(struct ll * list)
 {
+  if (!list)
+    return;
+
   ConfigCallback * cb;
   while(ll_shift(list, (void **)&cb))
   {
@@ -73,6 +76,8 @@ static void config_free(void * udata)
 {
   config_freeList(cfg.callbacks);
   config_freeList(cfg.tabCallbacks);
+  cfg.callbacks    = NULL;
+  cfg.tabCallbacks = NULL;
 }
 
 static void config_renderLGTab(void)

client/src/overlay/graphs.c

@@ -167,18 +167,28 @@ static bool graphs_init(void ** udata, const void * params)
 }
 
 static void graphs_free(void * udata)
+{
+  if (gs.graphs)
   {
     struct OverlayGraph * graph;
     while(ll_shift(gs.graphs, (void **)&graph))
       graphFree(graph);
     ll_free(gs.graphs);
     gs.graphs = NULL;
+  }
 
+  if (gs.plotSpec)
+  {
     ImPlotSpec_destroy(gs.plotSpec);
     gs.plotSpec = NULL;
+  }
+
+  if (gs.plotContext)
+  {
     ImPlot_DestroyContext(gs.plotContext);
     gs.plotContext = NULL;
   }
+}
 
 struct BufferMetrics
 {

client/src/overlay/msg.c

@@ -74,11 +74,16 @@ static void freeMsg(struct Msg * msg)
 }
 
 static void msg_free(void * udata)
+{
+  if (l_msg.messages)
   {
     struct Msg * msg;
     while(ll_shift(l_msg.messages, (void **)&msg))
       freeMsg(msg);
     ll_free(l_msg.messages);
+    l_msg.messages = NULL;
+  }
+
   l_msg.initialized = false;
 }
 

common/src/stringlist.c

@@ -51,6 +51,9 @@ StringList stringlist_new(bool owns_strings)
 
 void stringlist_free(StringList * sl)
 {
+  if (!sl || !*sl)
+    return;
+
   stringlist_clear(*sl);
 
   vector_destroy(&(*sl)->vector);