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mm/slub: fix memory leak with using debugfs_lookup()

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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@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Cc: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Acked-by: Roman Gushchin <roman.gushchin@linux.dev>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
This commit is contained in:
Greg Kroah-Hartman 2023-02-02 15:20:22 +01:00 committed by Vlastimil Babka
parent 88603b6dc4
commit aa4a86055b
1 changed files with 1 additions and 1 deletions
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2
mm/slub.c
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@ -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)