[PATCH RT 11/22] mm/slub: close possible memory-leak in kmem_cache_alloc_bulk()

[Julia Cartwright]

From: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>

4.9.115-rt94-rc1 stable review patch.
If you have any objection to the inclusion of this patch, let me know.

--- 8< --- 8< --- 8< ---
Under certain circumstances we could leak elements which were moved to
the local "to_free" list. The damage is limited since I can't find
any users here.

Cc: stable-rt@xxxxxxxxxxxxxxx
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
(cherry picked from commit 5022166d3b225bf5e343efb3ea01b3c5a41d69ba)
Signed-off-by: Julia Cartwright <julia@xxxxxx>
---
 mm/slub.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/slub.c b/mm/slub.c
index 67eb368b9314..738b2bccbd5f 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3209,6 +3209,7 @@ int kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size,
 	return i;
 error:
 	local_irq_enable();
+	free_delayed(&to_free);
 	slab_post_alloc_hook(s, flags, i, p);
 	__kmem_cache_free_bulk(s, i, p);
 	return 0;
-- 
2.18.0