Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH] mm/slub: fix memory leak with using debugfs_lookup() | Date | Thu, 2 Feb 2023 15:20:22 +0100 |
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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> --- 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) -- 2.39.1
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