[PATCH 1/4][Trivial] lib/kobject.c: Check parameter in kobject_get_path

[yan <clouds.yan@gmail.com>]

kobject_get_path is exported, it passes its parameter kobj to
get_kobj_path_length and fill_kobj_path which are both static 
and called only once here. So check this parameter.


Signed-off-by: Yan Hong <clouds.yan@gmail.com>
---
 lib/kobject.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/lib/kobject.c b/lib/kobject.c
index 38fcc60..56c8cb3 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -104,6 +104,9 @@ char *kobject_get_path(struct kobject *kobj, gfp_t gfp_mask)
 	char *path;
 	int len;
 
+	if (!kobj)
+		return NULL;
+
 	len = get_kobj_path_length(kobj);
 	if (len == 0)
 		return NULL;
-- 
1.7.5.1