[src/trunk]: src/sys/kern Use unsigned to avoid undefined behavior. Found by ...

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

details:   https://anonhg.NetBSD.org/src/rev/1e31783bf5f2
branches:  trunk
changeset: 458994:1e31783bf5f2
user:      msaitoh <msaitoh%NetBSD.org@localhost>
date:      Tue Aug 20 01:56:21 2019 +0000

description:
Use unsigned to avoid undefined behavior. Found by kUBSan.

diffstat:

 sys/kern/sys_select.c |  10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)

diffs (45 lines):

diff -r 4824a630a77f -r 1e31783bf5f2 sys/kern/sys_select.c
--- a/sys/kern/sys_select.c     Tue Aug 20 01:48:48 2019 +0000
+++ b/sys/kern/sys_select.c     Tue Aug 20 01:56:21 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: sys_select.c,v 1.46 2019/07/26 05:37:59 msaitoh Exp $  */
+/*     $NetBSD: sys_select.c,v 1.47 2019/08/20 01:56:21 msaitoh Exp $  */
 
 /*-
  * Copyright (c) 2007, 2008, 2009, 2010 The NetBSD Foundation, Inc.
@@ -84,7 +84,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: sys_select.c,v 1.46 2019/07/26 05:37:59 msaitoh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: sys_select.c,v 1.47 2019/08/20 01:56:21 msaitoh Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -391,7 +391,7 @@
                        ibits = *ibitp;
                        obits = 0;
                        while ((j = ffs(ibits)) && (fd = i + --j) < nfd) {
-                               ibits &= ~(1 << j);
+                               ibits &= ~(1U << j);
                                if ((fp = fd_getfile(fd)) == NULL)
                                        return (EBADF);
                                /*
@@ -400,7 +400,7 @@
                                 */
                                curlwp->l_selrec = fd;
                                if ((*fp->f_ops->fo_poll)(fp, sel_flag[msk])) {
-                                       obits |= (1 << j);
+                                       obits |= (1U << j);
                                        n++;
                                }
                                fd_putfile(fd);
@@ -754,7 +754,7 @@
                sip->sel_collision = 0;
                do {
                        index = ffs(mask) - 1;
-                       mask &= ~(1 << index);
+                       mask &= ~(1U << index);
                        sc = selcluster[index];
                        lock = sc->sc_lock;
                        mutex_spin_enter(lock);