[dm-devel] [PATCH] dm mpath: fix potential NULL pointer in feature arg processing

[Mike Snitzer]

If a user specifies an mpath target as having 1 or more features but
doesn't specify the corresponding feature args a NULL pointer occurs
in parse_features() -- @param_name is NULL when passed to strnicmp().

Signed-off-by: Mike Snitzer <snitzer at redhat.com>
Cc: stable at kernel.org
---
 drivers/md/dm-mpath.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index aa4e570..209991b 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -807,6 +807,11 @@ static int parse_features(struct arg_set *as, struct multipath *m)
 	if (!argc)
 		return 0;
 
+	if (argc > as->argc) {
+		ti->error = "not enough arguments for features";
+		return -EINVAL;
+	}
+
 	do {
 		param_name = shift(as);
 		argc--;
-- 
1.7.4.4