From c91c2a6e3fae7908ebe20952c6b3b6f61387a7bb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=89milie=20Feral?= <emilie.feral@numworks.com>
Date: Wed, 7 Oct 2020 17:09:14 +0200
Subject: [PATCH] [app/shared] CurveView: Avoid dashSize overflow in
 drawHorizontalOrVerticalSegment

---
 apps/shared/curve_view.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/apps/shared/curve_view.cpp b/apps/shared/curve_view.cpp
index 186003521..ec745db4a 100644
--- a/apps/shared/curve_view.cpp
+++ b/apps/shared/curve_view.cpp
@@ -412,6 +412,10 @@ void CurveView::drawHorizontalOrVerticalSegment(KDContext * ctx, KDRect rect, Ax
   if (dashSize < 0) {
     // Continuous segment is equivalent to one big dash
     dashSize = end - start;
+    if (dashSize < 0) {
+      // end-start overflowed
+      dashSize = KDCOORDINATE_MAX;
+    }
   }
   KDRect lineRect = KDRectZero;
   for (KDCoordinate i = start; i < end; i += 2*dashSize) {