[PATCH] mm/slub: fix kobject leak in sysfs_slab_add error path

[Hongling Zeng]

When kobject_init_and_add() fails in sysfs_slab_add(), the kobject
is not properly cleaned up, causing a memory leak.

According to the kobject API documentation, when kobject_init_and_add()
returns an error, the caller must call kobject_put() to properly clean
up the memory associated with the object. The current code only frees
the 'name' string but forgets to release the kobject reference.

Fix this by calling kobject_put() before jumping to the error label.

Fixes: 54b6a731025f ("slub: fix leak of 'name' in sysfs_slab_add")
Signed-off-by: Hongling Zeng <zenghongling@xxxxxxxxxx>
---
 mm/slub.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mm/slub.c b/mm/slub.c
index 9ec774dc7009..fec2cd08d129 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -9690,8 +9690,10 @@ static int sysfs_slab_add(struct kmem_cache *s)
 
 	s->kobj.kset = kset;
 	err = kobject_init_and_add(&s->kobj, &slab_ktype, NULL, "%s", name);
-	if (err)
+	if (err) {
+		kobject_put(&s->kobj);
 		goto out;
+	}
 
 	if (!unmergeable) {
 		/* Setup first alias */
-- 
2.25.1