dm mpath: fix NULL pointer dereference when path parameters missing

multipath_ctr() forgets to return an error after detecting
missing path parameters.  Fix this.

Signed-off-by: Patrick LoPresti <lopresti@gmail.com>
Cc: stable@kernel.org
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index 826bce7343b3697e5abdfd4c62e760250f6ecf3a..da2223aa727f86da02c13629e9f559163f858b9b 100644 (file)
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -706,6 +706,7 @@ static struct priority_group *parse_priority_group(struct arg_set *as,
 
                if (as->argc < nr_params) {
                        ti->error = "not enough path parameters";
+                       r = -EINVAL;
                        goto bad;
                }