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Account for trailing NUL bytes when calculating userland buffer size.

This commit is contained in:
mlelstv 2024-05-04 13:33:18 +00:00
parent c2c241e6a6
commit 9272c79b76
1 changed files with 4 additions and 2 deletions
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6
sys/kern/subr_iostat.c
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@ -1,4 +1,4 @@
/* $NetBSD: subr_iostat.c,v 1.25 2019/05/22 08:47:02 hannken Exp $ */ /* $NetBSD: subr_iostat.c,v 1.26 2024/05/04 13:33:18 mlelstv Exp $ */
/* NetBSD: subr_disk.c,v 1.69 2005/05/29 22:24:15 christos Exp */ /* NetBSD: subr_disk.c,v 1.69 2005/05/29 22:24:15 christos Exp */
/*- /*-
@ -68,7 +68,7 @@
*/ */
#include <sys/cdefs.h> #include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: subr_iostat.c,v 1.25 2019/05/22 08:47:02 hannken Exp $"); __KERNEL_RCSID(0, "$NetBSD: subr_iostat.c,v 1.26 2024/05/04 13:33:18 mlelstv Exp $");
#include <sys/param.h> #include <sys/param.h>
#include <sys/kernel.h> #include <sys/kernel.h>
@ -370,6 +370,8 @@ iostati_getnames(int disk_only, char *oldp, size_t *oldlenp, const void *newp,
memset(bf, 0, sizeof(bf)); memset(bf, 0, sizeof(bf));
if (first) { if (first) {
strncpy(bf, stats->io_name, sizeof(bf)); strncpy(bf, stats->io_name, sizeof(bf));
/* account for trailing NUL byte */
needed += 1;
first = 0; first = 0;
} else { } else {
bf[0] = ' '; bf[0] = ' ';