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Avoid division by zero if label isn't valid.

This commit is contained in:
mlelstv 2020-03-27 11:13:57 +00:00
parent b532442005
commit 8bf0ad7b19
1 changed files with 6 additions and 2 deletions
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8
sys/kern/subr_disk.c
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@ -1,4 +1,4 @@
/* $NetBSD: subr_disk.c,v 1.129 2019/09/30 23:23:59 cnst Exp $ */
/* $NetBSD: subr_disk.c,v 1.130 2020/03/27 11:13:57 mlelstv Exp $ */
/*-
* Copyright (c) 1996, 1997, 1999, 2000, 2009 The NetBSD Foundation, Inc.
@ -67,7 +67,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: subr_disk.c,v 1.129 2019/09/30 23:23:59 cnst Exp $");
__KERNEL_RCSID(0, "$NetBSD: subr_disk.c,v 1.130 2020/03/27 11:13:57 mlelstv Exp $");
#include <sys/param.h>
#include <sys/kernel.h>
@ -440,6 +440,10 @@ int
disk_read_sectors(void (*strat)(struct buf *), const struct disklabel *lp,
struct buf *bp, unsigned int sector, int count)
{
if ((lp->d_secsize / DEV_BSIZE) == 0 || lp->d_secpercyl == 0)
return EINVAL;
bp->b_blkno = btodb((off_t)sector * lp->d_secsize);
bp->b_bcount = count * lp->d_secsize;
bp->b_flags = (bp->b_flags & ~B_WRITE) | B_READ;