From 03a9828a56095511d78e71bc4eb2ce5ee981a6b3 Mon Sep 17 00:00:00 2001
From: Gabor Kiss-Vamosi <kisvegabor@gmail.com>
Date: Mon, 19 Jun 2023 10:28:23 +0200
Subject: [PATCH] fix(btnmatrix): fix array out of bounds addressing with
 groups and no buttons

---
 src/widgets/btnmatrix/lv_btnmatrix.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/widgets/btnmatrix/lv_btnmatrix.c b/src/widgets/btnmatrix/lv_btnmatrix.c
index adfe03f95..1df2281f1 100644
--- a/src/widgets/btnmatrix/lv_btnmatrix.c
+++ b/src/widgets/btnmatrix/lv_btnmatrix.c
@@ -521,6 +521,8 @@ static void lv_btnmatrix_event(const lv_obj_class_t * class_p, lv_event_t * e)
         btnm->btn_id_sel = LV_BTNMATRIX_BTN_NONE;
     }
     else if(code == LV_EVENT_FOCUSED) {
+        if(btnm->btn_cnt == 0) return;
+
         lv_indev_t * indev = lv_event_get_param(e);
         lv_indev_type_t indev_type = lv_indev_get_type(indev);