From dab3a04fbd2c4658614471cd4d8550ce0e0cef7b Mon Sep 17 00:00:00 2001
From: Mamoru TASAKA <mtasaka@fedoraproject.org>
Date: Thu, 10 Dec 2020 16:38:26 +0900
Subject: [PATCH] beats/draw_beats: avoid integer overflow by multiplication

gcc10 -fsanitize=undefined detects the following integer overflow:
------------------------------------------
../../../hacks/glx/beats.c:325:53: runtime error: signed integer overflow: 3665625 * 42587 cannot be represented in type 'int'
../../../hacks/glx/beats.c:326:21: runtime error: signed integer overflow: 1489149219 * 1233599 cannot be represented in type 'int'
------------------------------------------
Avoid this by using unsigned integer.
---
 hacks/glx/beats.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/hacks/glx/beats.c b/hacks/glx/beats.c
index 64fd689..19565ec 100644
--- a/hacks/glx/beats.c
+++ b/hacks/glx/beats.c
@@ -322,8 +322,8 @@ draw_beats (ModeInfo *mi)
       }
     }
     /* pseudo-random generator based on current minute */
-    timeSeed = (((tmM+1) * (tmM+1) * ((tmH+1) * 37) *
-		 ((tmD+1) * 1151) * 1233599) % 653);
+    timeSeed = (((tmM+1) * (tmM+1) * ((tmH+1) * 37ULL) *
+		 ((tmD+1) * 1151ULL) * 1233599ULL) % 653);
     cycle = timeSeed % 4;
     if(bp->preset_cycle != -1){
       cycle = bp->preset_cycle;
-- 
2.29.2