kobject: fix oops in to_kset()

Check whether kset is NULL or not before doing container_of().

From Dominik Brodowski

diff --git a/include/linux/kobject.h b/include/linux/kobject.h
index e93b438b829c505ef2a6b67adf18ecbf950d47f8..e9cfa0dc3d2494ef48765691eff803e5833264db 100644 (file)
--- a/include/linux/kobject.h
+++ b/include/linux/kobject.h
@@ -73,7 +73,7 @@ extern void kset_unregister(struct kset * k);
 
 static inline struct kset * to_kset(struct kobject * kobj)
 {
-       return container_of(kobj,struct kset,kobj);
+       return kobj ? container_of(kobj,struct kset,kobj) : NULL;
 }
 
 static inline struct kset * kset_get(struct kset * k)