From: Mikulas Patocka <[email-masked]>

Free path selector if the arguments are invalid.

This command (note that it is invalid) causes reference leak on module
"dm_round_robin" and prevents the module from being removed.

dmsetup create --table '0 2 multipath 0 0 1 1 round-robin /dev/sdh' mpath0

Signed-off-by: Mikulas Patocka <[email-masked]>
Signed-off-by: Alasdair G Kergon <[email-masked]>
---
 drivers/md/dm-mpath.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletion(-)

Index: linux-2.6.26/drivers/md/dm-mpath.c
===================================================================
--- linux-2.6.26.orig/drivers/md/dm-mpath.c	2008-07-20 18:44:28.000000000 +0100
+++ linux-2.6.26/drivers/md/dm-mpath.c	2008-07-20 18:45:53.000000000 +0100
@@ -525,8 +525,10 @@ static int parse_path_selector(struct ar
 	}
 
 	r = read_param(_params, shift(as), &ps_argc, &ti->error);
-	if (r)
+	if (r) {
+		dm_put_path_selector(pst);
 		return -EINVAL;
+	}
 
 	r = pst->create(&pg->ps, ps_argc, as->argv);
 	if (r) {