File CVE-2021-4216.patch of Package mupdf.17658

From 22c47acbd52949421f8c7cb46ea1556827d0fcbf Mon Sep 17 00:00:00 2001
From: Sebastian Rasmussen <sebras@gmail.com>
Date: Tue, 18 Jan 2022 20:33:10 +0100
Subject: [PATCH] Bug 704834: Fix division by zero for zero width pages in
 muraster.

---
 source/tools/muraster.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- mupdf-1.12.0-source.orig/source/tools/muraster.c
+++ mupdf-1.12.0-source/source/tools/muraster.c
@@ -965,8 +965,9 @@ initialise_banding(fz_context *ctx, rend
 
 	w = render->ibounds.x1 - render->ibounds.x0;
 	min_band_mem = bpp * w * min_band_height;
-	reps = (int)(max_band_memory / min_band_mem);
-	if (reps < 1)
+	if (min_band_mem > 0)
+		reps = (int)(max_band_memory / min_band_mem);
+	if (min_band_mem == 0 || reps < 1)
 		reps = 1;
 
 	/* Adjust reps to even out the work between threads */