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Fix clrbits() so that it doesn't mask no bits out of the byte after the

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range (when the last bit to be cleared is the msb of a byte).
Fixes PR/42312 in a slightly better way than proposed.
This commit is contained in:
dsl 2009-11-13 19:15:24 +00:00
parent be258d919e
commit f3583ee6ce
1 changed files with 4 additions and 3 deletions
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7
sys/kern/tty_subr.c
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@ -1,4 +1,4 @@
/* $NetBSD: tty_subr.c,v 1.37 2009/11/13 19:00:15 dsl Exp $ */
/* $NetBSD: tty_subr.c,v 1.38 2009/11/13 19:15:24 dsl Exp $ */
/*
* Copyright (c) 1993, 1994 Theo de Raadt
@ -29,7 +29,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: tty_subr.c,v 1.37 2009/11/13 19:00:15 dsl Exp $");
__KERNEL_RCSID(0, "$NetBSD: tty_subr.c,v 1.38 2009/11/13 19:15:24 dsl Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -312,10 +312,11 @@ clrbits(u_char *cp, unsigned int off, unsigned int len)
return;
}
len--;
sby = off / NBBY;
sbi = off % NBBY;
eby = (off+len) / NBBY;
ebi = (off+len) % NBBY;
ebi = (off+len) % NBBY + 1;
if (sby == eby) {
mask = ((1 << (ebi - sbi)) - 1) << sbi;
cp[sby] &= ~mask;