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Tile event handler : read the event data only if the event is a "value changed event". LVGL sends many other event and some of them do not set the event data (global static variable) to a valid address, which may cause an invalid read. I noticed that when porting this class on RISC-V platform (BL602).

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This commit is contained in:
Jean-François Milants 2021-07-25 19:55:21 +02:00
parent 7b75ca591d
commit 514481ef7f
2 changed files with 11 additions and 9 deletions
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14
src/displayapp/screens/Tile.cpp
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@ -6,15 +6,17 @@ using namespace Pinetime::Applications::Screens;
namespace { namespace {
static void lv_update_task(struct _lv_task_t* task) { static void lv_update_task(struct _lv_task_t* task) {
auto user_data = static_cast<Tile*>(task->user_data); auto* user_data = static_cast<Tile*>(task->user_data);
user_data->UpdateScreen(); user_data->UpdateScreen();
} }
static void event_handler(lv_obj_t* obj, lv_event_t event) { static void event_handler(lv_obj_t* obj, lv_event_t event) {
if (event != LV_EVENT_VALUE_CHANGED) return;
Tile* screen = static_cast<Tile*>(obj->user_data); Tile* screen = static_cast<Tile*>(obj->user_data);
uint32_t* eventDataPtr = (uint32_t*) lv_event_get_data(); auto* eventDataPtr = (uint32_t*) lv_event_get_data();
uint32_t eventData = *eventDataPtr; uint32_t eventData = *eventDataPtr;
screen->OnObjectEvent(obj, event, eventData); screen->OnValueChangedEvent(obj, eventData);
} }
} }
@ -124,9 +126,9 @@ bool Tile::Refresh() {
return running; return running;
} }
void Tile::OnObjectEvent(lv_obj_t* obj, lv_event_t event, uint32_t buttonId) { void Tile::OnValueChangedEvent(lv_obj_t* obj, uint32_t buttonId) {
if (event == LV_EVENT_VALUE_CHANGED) { if(obj != btnm1) return;
app->StartApp(apps[buttonId], DisplayApp::FullRefreshDirections::Up); app->StartApp(apps[buttonId], DisplayApp::FullRefreshDirections::Up);
running = false; running = false;
}
} }

2
src/displayapp/screens/Tile.h
View file

@ -32,7 +32,7 @@ namespace Pinetime {
bool Refresh() override; bool Refresh() override;
void UpdateScreen(); void UpdateScreen();
void OnObjectEvent(lv_obj_t* obj, lv_event_t event, uint32_t buttonId); void OnValueChangedEvent(lv_obj_t* obj, uint32_t buttonId);
private: private:
Pinetime::Controllers::Battery& batteryController; Pinetime::Controllers::Battery& batteryController;