dm mpath: add m->hw_handler_name NULL pointer check in parse_hw_handler()

Avoids false positive of no hardware handler being specified (which is
implied by a NULL m->hw_handler_name).

Signed-off-by: tang.junhui <tang.junhui@zte.com.cn>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index e477af8596e276c6665ec97042041b9397188f22..d234b6c33646f6d9e9387fb64ca85d803bade53f 100644 (file)
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -1002,6 +1002,8 @@ static int parse_hw_handler(struct dm_arg_set *as, struct multipath *m)
        }
 
        m->hw_handler_name = kstrdup(dm_shift_arg(as), GFP_KERNEL);
+       if (!m->hw_handler_name)
+               return -EINVAL;
 
        if (hw_argc > 1) {
                char *p;