From 311f5e10cd58cc3fadd71b02963fdfc414b33a57 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Caol=C3=A1n=20McNamara?= <caolanm@redhat.com>
Date: Wed, 31 Aug 2022 10:14:18 +0100
Subject: ofz#46165 avoid a divide by zero seen fuzzing libreoffice rendering

---
 src/cairo-pen.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/cairo-pen.c b/src/cairo-pen.c
index 9bf960423..a4b84aae5 100644
--- a/src/cairo-pen.c
+++ b/src/cairo-pen.c
@@ -289,7 +289,12 @@ _cairo_pen_vertices_needed (double	    tolerance,
     } else if (tolerance >= major_axis) {
 	num_vertices = 4;
     } else {
-	num_vertices = ceil (2*M_PI / acos (1 - tolerance / major_axis));
+	double divisor = acos (1 - tolerance / major_axis);
+
+	if (divisor == 0.0)
+	    return 4;
+
+	num_vertices = ceil (2*M_PI / divisor);
 
 	/* number of vertices must be even */
 	if (num_vertices % 2)
-- 
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