[PATCH 4.18 121/135] dm cache: destroy migration_cache if cache target registration failed

Greg Kroah-Hartman
2018-10-16T17:16:40Z

From: Shenghui Wang <shhuiw@foxmail.com>

commit c7cd55504a5b0fc826a2cd9540845979d24ae542 upstream.

Commit 7e6358d244e47 ("dm: fix various targets to dm_register_target
after module __init resources created") inadvertently introduced this
bug when it moved dm_register_target() after the call to KMEM_CACHE().

Fixes: 7e6358d244e47 ("dm: fix various targets to dm_register_target after module __init resources created")
Cc: stable@vger.kernel.org
Signed-off-by: Shenghui Wang <shhuiw@foxmail.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/md/dm-cache-target.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)

--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -3492,14 +3492,13 @@ static int __init dm_cache_init(void)
int r;

migration_cache = KMEM_CACHE(dm_cache_migration, 0);
- if (!migration_cache) {
- dm_unregister_target(&cache_target);
+ if (!migration_cache)
return -ENOMEM;
- }

r = dm_register_target(&cache_target);
if (r) {
DMERR("cache target registration failed: %d", r);
+ kmem_cache_destroy(migration_cache);
return r;
}