From: Duna Oh <duna.oh@samsung.com>
Date: Tue, 8 Feb 2022 06:39:18 +0000 (+0900)
Subject: tablet: Fix divide by zero error. 'count' could be zero
X-Git-Tag: accepted/tizen/unified/20240105.013022~10
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=cd5c1eb3f79d529a703e8a87813149c4be09ec4d;p=platform%2Fupstream%2Flibinput.git

tablet: Fix divide by zero error. 'count' could be zero
---

diff --git a/src/evdev-tablet.c b/src/evdev-tablet.c
index c290845c..b723d98c 100644
--- a/src/evdev-tablet.c
+++ b/src/evdev-tablet.c
@@ -686,6 +686,9 @@ tablet_smoothen_axes(const struct tablet_dispatch *tablet,
 	size_t count = tablet_history_size(tablet);
 	struct tablet_axes smooth = { 0 };
 
+	if (count <= 0)
+		return;
+
 	for (i = 0; i < count; i++) {
 		const struct tablet_axes *a = tablet_history_get(tablet, i);
 
@@ -696,11 +699,11 @@ tablet_smoothen_axes(const struct tablet_dispatch *tablet,
 		smooth.tilt.y += a->tilt.y;
 	}
 
-	axes->point.x = smooth.point.x/count;
-	axes->point.y = smooth.point.y/count;
+	axes->point.x = smooth.point.x/(double)count;
+	axes->point.y = smooth.point.y/(double)count;
 
-	axes->tilt.x = smooth.tilt.x/count;
-	axes->tilt.y = smooth.tilt.y/count;
+	axes->tilt.x = smooth.tilt.x/(double)count;
+	axes->tilt.y = smooth.tilt.y/(double)count;
 }
 
 static bool