[src/trunk]: src/sys/sys Prevent signed integer left shift UB in FD_SET(), FD...

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

details:   https://anonhg.NetBSD.org/src/rev/f8dbe4f12190
branches:  trunk
changeset: 323645:f8dbe4f12190
user:      kamil <kamil%NetBSD.org@localhost>
date:      Sun Jun 24 12:05:40 2018 +0000

description:
Prevent signed integer left shift UB in FD_SET(), FD_CLR(), FD_ISSET()

Set the type of shifted integer 1 to unsigned int.

Detected with MKSANITIZER/UBSan in sysinst(8).

diffstat:

 sys/sys/fd_set.h |  8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diffs (24 lines):

diff -r 885cda268e4c -r f8dbe4f12190 sys/sys/fd_set.h
--- a/sys/sys/fd_set.h  Sun Jun 24 11:51:15 2018 +0000
+++ b/sys/sys/fd_set.h  Sun Jun 24 12:05:40 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: fd_set.h,v 1.6 2015/11/06 15:41:25 christos Exp $      */
+/*     $NetBSD: fd_set.h,v 1.7 2018/06/24 12:05:40 kamil Exp $ */
 
 /*-
  * Copyright (c) 1992, 1993
@@ -68,11 +68,11 @@
 } fd_set;
 
 #define        FD_SET(n, p)    \
-    ((p)->fds_bits[(unsigned)(n) >> __NFDSHIFT] |= (1 << ((n) & __NFDMASK)))
+    ((p)->fds_bits[(unsigned)(n) >> __NFDSHIFT] |= (1U << ((n) & __NFDMASK)))
 #define        FD_CLR(n, p)    \
-    ((p)->fds_bits[(unsigned)(n) >> __NFDSHIFT] &= ~(1 << ((n) & __NFDMASK)))
+    ((p)->fds_bits[(unsigned)(n) >> __NFDSHIFT] &= ~(1U << ((n) & __NFDMASK)))
 #define        FD_ISSET(n, p)  \
-    ((p)->fds_bits[(unsigned)(n) >> __NFDSHIFT] & (1 << ((n) & __NFDMASK)))
+    ((p)->fds_bits[(unsigned)(n) >> __NFDSHIFT] & (1U << ((n) & __NFDMASK)))
 #if __GNUC_PREREQ__(2, 95)
 #define        FD_ZERO(p)      (void)__builtin_memset((p), 0, sizeof(*(p)))
 #else