[src/trunk]: src/external/bsd/cron/dist Fix from Michael Kaufmann in PR bin/5...

[kre <kre%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/36f05b5a86ee
branches:  trunk
changeset: 834109:36f05b5a86ee
user:      kre <kre%NetBSD.org@localhost>
date:      Sat Jul 28 13:51:26 2018 +0000

description:
Fix from Michael Kaufmann in PR bin/53476

Do modulus using unsigned arith, and then convert the result to
int, rather than converting the arc4random() result to int (which
might be negative) and performing a modulus on that (with a
potentially negative answer).

diffstat:

 external/bsd/cron/dist/entry.c |  6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diffs (27 lines):

diff -r fe3ae8b962f0 -r 36f05b5a86ee external/bsd/cron/dist/entry.c
--- a/external/bsd/cron/dist/entry.c    Sat Jul 28 09:57:59 2018 +0000
+++ b/external/bsd/cron/dist/entry.c    Sat Jul 28 13:51:26 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: entry.c,v 1.8 2018/06/14 22:04:28 christos Exp $       */
+/*     $NetBSD: entry.c,v 1.9 2018/07/28 13:51:26 kre Exp $    */
 
 /*
  * Copyright 1988,1990,1993,1994 by Paul Vixie
@@ -26,7 +26,7 @@
 #if 0
 static char rcsid[] = "Id: entry.c,v 1.17 2004/01/23 18:56:42 vixie Exp";
 #else
-__RCSID("$NetBSD: entry.c,v 1.8 2018/06/14 22:04:28 christos Exp $");
+__RCSID("$NetBSD: entry.c,v 1.9 2018/07/28 13:51:26 kre Exp $");
 #endif
 #endif
 
@@ -471,7 +471,7 @@
        if (low >= high)
                return low;
        else
-               return (int)arc4random() % (high - low + 1) + low;
+               return (int)(arc4random() % (unsigned)((high - low + 1) + low));
 }
 
 static int