From 029150ac3b075a8e936e6c722c6f63cf80594e2a Mon Sep 17 00:00:00 2001
From: foamyguy <foamyguy@gmail.com>
Date: Sun, 15 Aug 2021 19:46:20 -0500
Subject: [PATCH] validate initial point is in-bounds

---
 shared-bindings/bitmaptools/__init__.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/shared-bindings/bitmaptools/__init__.c b/shared-bindings/bitmaptools/__init__.c
index e566168879..761a94c4c9 100644
--- a/shared-bindings/bitmaptools/__init__.c
+++ b/shared-bindings/bitmaptools/__init__.c
@@ -345,6 +345,12 @@ STATIC mp_obj_t bitmaptools_obj_boundary_fill(size_t n_args, const mp_obj_t *pos
     int16_t x = args[ARG_x].u_int;
     int16_t y = args[ARG_y].u_int;
 
+    if (x < 0 || x >= destination->width) {
+        mp_raise_ValueError(translate("out of range of target"));
+    }
+    if (y < 0 || y >= destination->height) {
+        mp_raise_ValueError(translate("out of range of target"));
+    }
 
     common_hal_bitmaptools_boundary_fill(destination, x, y, value, background_value);