>Number: 162347
>Category: kern
>Synopsis: [patch] remove the extra variable in /sys/libkern/random.c
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Mon Nov 07 05:50:12 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator: Ivan Klymenko
>Release: FreeBSD 10.0-CURRENT amd64
>Organization:
individual
>Environment:
FreeBSD nonamehost 9.9-CURRENT FreeBSD 9.9-CURRENT #0 r227075M: Sat Nov 5
16:13:18 EET 2011 ivan@nonamehost:/usr/obj/usr/src/sys/mk9 amd64
>Description:
remove the extra variable.
variable "x" is not needed.
>How-To-Repeat:
>Fix:
Patch attached with submission follows:
--- ./sys/libkern/random.c.orig 2011-11-05 15:36:23.000000000 +0200
+++ ./sys/libkern/random.c 2011-11-05 15:40:18.000000000 +0200
@@ -57,19 +57,19 @@
u_long
random()
{
- register long x, hi, lo, t;
+ register long hi, lo, t;
/*
- * Compute x[n + 1] = (7^5 * x[n]) mod (2^31 - 1).
+ * Compute randseed[n + 1] = (7^5 * randseed[n]) mod (2^31 - 1).
* From "Random number generators: good ones are hard to find",
* Park and Miller, Communications of the ACM, vol. 31, no. 10,
* October 1988, p. 1195.
*/
/* Can't be initialized with 0, so use another value. */
- if ((x = randseed) == 0)
- x = 123459876;
- hi = x / 127773;
- lo = x % 127773;
+ if (randseed == 0)
+ randseed = 123459876;
+ hi = randseed / 127773;
+ lo = randseed % 127773;
t = 16807 * lo - 2836 * hi;
if (t < 0)
t += 0x7fffffff;
>Release-Note:
>Audit-Trail:
>Unformatted:
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