[dm-devel] [PATCH] md/dm-mpath: Add NULL pointer check in parse_hw_handler()

[tang.junhui at zte.com.cn]

From: "tang.junhui" <tang.junhui at zte.com.cn>

m->hw_handler_name value should be checked in parse_hw_handler()
after calling kstrdup() to avoid access of NULL pointer.

Signed-off-by: tang.junhui <tang.junhui at zte.com.cn>
---
 drivers/md/dm-mpath.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index d376dc8..77428fb 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -732,6 +732,9 @@ static int parse_hw_handler(struct dm_arg_set *as, struct multipath *m)
 		return 0;
 
 	m->hw_handler_name = kstrdup(dm_shift_arg(as), GFP_KERNEL);
+	if (!m->hw_handler_name)
+		return -ENOMEM;
+
 	if (!try_then_request_module(scsi_dh_handler_exist(m->hw_handler_name),
 				     "scsi_dh_%s", m->hw_handler_name)) {
 		ti->error = "unknown hardware handler type";
-- 
2.8.1.windows.1