dm: flakey fix corrupt_bio_byte error path

If no arguments were provided to the corrupt_bio_byte feature an error
should be returned immediately.

Reported-by: Zdenek Kabelac <zkabelac@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

diff --git a/drivers/md/dm-flakey.c b/drivers/md/dm-flakey.c
index 89f73ca..f84c080 100644 (file)
--- a/drivers/md/dm-flakey.c
+++ b/drivers/md/dm-flakey.c
@@ -81,8 +81,10 @@ static int parse_features(struct dm_arg_set *as, struct flakey_c *fc,
                 * corrupt_bio_byte <Nth_byte> <direction> <value> <bio_flags>
                 */
                if (!strcasecmp(arg_name, "corrupt_bio_byte")) {
-                       if (!argc)
+                       if (!argc) {
                                ti->error = "Feature corrupt_bio_byte requires parameters";
+                               return -EINVAL;
+                       }
 
                        r = dm_read_arg(_args + 1, as, &fc->corrupt_bio_byte, &ti->error);
                        if (r)