From: Mike Snitzer <[email-masked]>

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

Reported-by: Zdenek Kabelac <[email-masked]>
Signed-off-by: Mike Snitzer <[email-masked]>
Signed-off-by: Alasdair G Kergon <[email-masked]>

---
 drivers/md/dm-flakey.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Index: linux-3.1-rc7/drivers/md/dm-flakey.c
===================================================================
--- linux-3.1-rc7.orig/drivers/md/dm-flakey.c
+++ linux-3.1-rc7/drivers/md/dm-flakey.c
@@ -81,8 +81,10 @@ static int parse_features(struct dm_arg_
 		 * 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)