On 2/2/23 15:20, Greg Kroah-Hartman wrote:
> When calling debugfs_lookup() the result must have dput() called on it,
> otherwise the memory will leak over time. To make things simpler, just
> call debugfs_lookup_and_remove() instead which handles all of the logic
> at once.
>
> Cc: Christoph Lameter <cl@xxxxxxxxx>
> Cc: Pekka Enberg <penberg@xxxxxxxxxx>
> Cc: David Rientjes <rientjes@xxxxxxxxxx>
> Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> Cc: Vlastimil Babka <vbabka@xxxxxxx>
> Cc: Roman Gushchin <roman.gushchin@xxxxxxxxx>
> Cc: Hyeonggon Yoo <42.hyeyoo@xxxxxxxxx>
> Cc: linux-mm@xxxxxxxxx
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Thanks, added to slab/for-6.3/fixes
> ---
> mm/slub.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/slub.c b/mm/slub.c
> index 13459c69095a..4880e461fcc5 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -6449,7 +6449,7 @@ static void debugfs_slab_add(struct kmem_cache *s)
>
> void debugfs_slab_release(struct kmem_cache *s)
> {
> - debugfs_remove_recursive(debugfs_lookup(s->name, slab_debugfs_root));
> + debugfs_lookup_and_remove(s->name, slab_debugfs_root);
> }
>
> static int __init slab_debugfs_init(void)
