X-Git-Url: http://git.hungrycats.org/cgi-bin/gitweb.cgi?p=xscreensaver;a=blobdiff_plain;f=hacks%2Frd-bomb.c;fp=hacks%2Frd-bomb.c;h=08ec7a753d9c84dd8c2a6accab19ac5b607c8ecd;hp=878f5b9b6996ffdad0a49e2333f31a5599634387;hb=d5186197bc394e10a4402f7f6d23fbb14103bc50;hpb=6afd6db0ae9396cd7ff897ade597cd5483f49b0e

diff --git a/hacks/rd-bomb.c b/hacks/rd-bomb.c
index 878f5b9b..08ec7a75 100644
--- a/hacks/rd-bomb.c
+++ b/hacks/rd-bomb.c
@@ -236,7 +236,9 @@ pixack_frame(struct state *st, char *pix_buf)
       /* John E. Pearson "Complex Patterns in a Simple System"
 	 Science, July 1993 */
 
-      uvv = (((r1 * r2) >> bps) * r2) >> bps;
+      /* uvv = (((r1 * r2) >> bps) * r2) >> bps; */
+      /* avoid signed integer overflow */
+      uvv = ((((r1 >> 1)* r2) >> bps) * r2) >> (bps - 1);
       switch (st->reaction) {  /* costs 4% */
       case 0:
 	r1 += 4 * (((28 * (mx-r1)) >> 10) - uvv);