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dm raid: stop using BUG() in __rdev_sectors()

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Return 0 rather than BUG() if __rdev_sectors() fails and catch invalid
rdev size in the constructor.

Reported-by: Hannes Reinecke <hare@suse.de>
Cc: stable@vger.kernel.org
Signed-off-by: Heinz Mauelshagen <heinzm@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Heinz Mauelshagen 2017-06-30 15:45:58 +02:00 committed by Mike Snitzer
parent 3b1a94c88b
commit 4d49f1b4a1
1 changed files with 10 additions and 3 deletions
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13
drivers/md/dm-raid.c
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@ -1571,7 +1571,7 @@ static sector_t __rdev_sectors(struct raid_set *rs)
return rdev->sectors;
}
BUG(); /* Constructor ensures we got some. */
return 0;
}
/* Calculate the sectors per device and per array used for @rs */
@ -2930,7 +2930,7 @@ static int raid_ctr(struct dm_target *ti, unsigned int argc, char **argv)
bool resize;
struct raid_type *rt;
unsigned int num_raid_params, num_raid_devs;
sector_t calculated_dev_sectors;
sector_t calculated_dev_sectors, rdev_sectors;
struct raid_set *rs = NULL;
const char *arg;
struct rs_layout rs_layout;
@ -3006,7 +3006,14 @@ static int raid_ctr(struct dm_target *ti, unsigned int argc, char **argv)
if (r)
goto bad;
resize = calculated_dev_sectors != __rdev_sectors(rs);
rdev_sectors = __rdev_sectors(rs);
if (!rdev_sectors) {
ti->error = "Invalid rdev size";
r = -EINVAL;
goto bad;
}
resize = calculated_dev_sectors != rdev_sectors;
INIT_WORK(&rs->md.event_work, do_table_event);
ti->private = rs;