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Message-Id: <20100219163256.551334642@kvm.kroah.org>
Date: Fri, 19 Feb 2010 08:30:24 -0800
From: Greg KH <gregkh@...e.de>
To: linux-kernel@...r.kernel.org, stable@...nel.org
Cc: stable-review@...nel.org, torvalds@...ux-foundation.org,
akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
Nikanth Karthikesan <knikanth@...e.de>,
Alasdair G Kergon <agk@...hat.com>
Subject: [91/93] dm stripe: avoid divide by zero with invalid stripe count
2.6.32-stable review patch. If anyone has any objections, please let us know.
------------------
From: Nikanth Karthikesan <knikanth@...e.de>
commit 781248c1b50c776a9ef4be1130f84ced1cba42fe upstream.
If a table containing zero as stripe count is passed into stripe_ctr
the code attempts to divide by zero.
This patch changes DM_TABLE_LOAD to return -EINVAL if the stripe count
is zero.
We now get the following error messages:
device-mapper: table: 253:0: striped: Invalid stripe count
device-mapper: ioctl: error adding target to table
Signed-off-by: Nikanth Karthikesan <knikanth@...e.de>
Signed-off-by: Alasdair G Kergon <agk@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
drivers/md/dm-stripe.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/md/dm-stripe.c
+++ b/drivers/md/dm-stripe.c
@@ -110,7 +110,7 @@ static int stripe_ctr(struct dm_target *
}
stripes = simple_strtoul(argv[0], &end, 10);
- if (*end) {
+ if (!stripes || *end) {
ti->error = "Invalid stripe count";
return -EINVAL;
}
--
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