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dm stripe: avoid divide by zero with invalid stripe count 

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@suse.de>
Cc: stable@kernel.org
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Nikanth Karthikesan 2010-02-16 18:42:47 +00:00 committed by Alasdair G Kergon
parent 0813e22d4e
commit 781248c1b5
1 changed files with 1 additions and 1 deletions
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2
drivers/md/dm-stripe.c
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@ -110,7 +110,7 @@ static int stripe_ctr(struct dm_target *ti, unsigned int argc, char **argv)
}
stripes = simple_strtoul(argv[0], &end, 10);
if (*end) {
if (!stripes || *end) {
ti->error = "Invalid stripe count";
return -EINVAL;
}