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Subject[PATCH v2 0/3] Refactor __kmem_cache_create() and fix memory leak
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I found a memory leak of kobj->name in sysfs_slab_add() which is introduced
by 80da026a8e5d ("mm/slub: fix slab double-free in case of duplicate sysfs filename").
Following the rules stated in the comment for kobject_init_and_add():

If this function returns an error, kobject_put() must be called to
properly clean up the memory associated with the object.

We should use kobject_put() to free kobject.

But we can't simply add kobject_put() since it will free kmem_cache too.
If we use kobject_put(), we need to skip other release functions.

In this series, We refactor the code to separate sysfs_slab_add() and
debugfs_slab_add() from __kmem_cache_create(), and then use kobject_put()
to free kobject in sysfs_slab_add(). This can fix the memory leak of
kobject->name.

v1->v2: Fix build error reported by kernel test robot <lkp@intel.com>.

Liu Shixin (3):
mm/slab_common: Move cache_name to create_cache()
mm/slub: Refactor __kmem_cache_create()
mm/slub: Fix memory leak of kobj->name in sysfs_slab_add()

include/linux/slub_def.h | 11 +++++++++
mm/slab_common.c | 44 ++++++++++++++++++----------------
mm/slub.c | 52 ++++++++++------------------------------
3 files changed, 48 insertions(+), 59 deletions(-)

--
2.25.1

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