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md: fix error path when duplicate name is found on md device creation.

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When an md device is created by name (rather than number) we need to
check that the name is not already in use.  If this check finds a
duplicate, we return an error without dropping the lock or freeing
the newly create mddev.
This patch fixes that.

Cc: stable@kernel.org
Found-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2009-07-01 12:27:21 +10:00
parent b8d966efd9
commit 1ec22eb2b4
1 changed files with 2 additions and 0 deletions
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2
drivers/md/md.c
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@ -3862,6 +3862,8 @@ static int md_alloc(dev_t dev, char *name)
if (mddev2->gendisk &&
strcmp(mddev2->gendisk->disk_name, name) == 0) {
spin_unlock(&all_mddevs_lock);
mutex_unlock(&disks_mutex);
mddev_put(mddev);
return -EEXIST;
}
spin_unlock(&all_mddevs_lock);