The return value will be used in later patch to fix uaf for slave_dir
and bd_holder_dir in block layer.
Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx>
---
include/linux/kobject.h | 2 +-
lib/kobject.c | 7 +++++--
2 files changed, 6 insertions(+), 3 deletions(-)
diff --git a/include/linux/kobject.h b/include/linux/kobject.h
index 57fb972fea05..f12de6274c51 100644
--- a/include/linux/kobject.h
+++ b/include/linux/kobject.h
@@ -110,7 +110,7 @@ extern int __must_check kobject_move(struct kobject *, struct kobject *);
extern struct kobject *kobject_get(struct kobject *kobj);
extern struct kobject * __must_check kobject_get_unless_zero(
struct kobject *kobj);
-extern void kobject_put(struct kobject *kobj);
+extern bool kobject_put(struct kobject *kobj);
extern const void *kobject_namespace(struct kobject *kobj);
extern void kobject_get_ownership(struct kobject *kobj,
diff --git a/lib/kobject.c b/lib/kobject.c
index a0b2dbfcfa23..f86c55ae7376 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -711,15 +711,18 @@ static void kobject_release(struct kref *kref)
*
* Decrement the refcount, and if 0, call kobject_cleanup().
*/
-void kobject_put(struct kobject *kobj)
+bool kobject_put(struct kobject *kobj)
{
if (kobj) {
if (!kobj->state_initialized)
WARN(1, KERN_WARNING
"kobject: '%s' (%p): is not initialized, yet kobject_put() is being called.\n",
kobject_name(kobj), kobj);
- kref_put(&kobj->kref, kobject_release);
+ if (kref_put(&kobj->kref, kobject_release))
+ return true;
}
+
+ return false;
}
EXPORT_SYMBOL(kobject_put);
--
2.31.1
