[PATCH 5.4 106/214] blkcg: fix memleak for iolatency

Greg Kroah-Hartman
2020-09-01T16:23:01Z

From: Yufen Yu <yuyufen@huawei.com>

[ Upstream commit 27029b4b18aa5d3b060f0bf2c26dae254132cfce ]

Normally, blkcg_iolatency_exit() will free related memory in iolatency
when cleanup queue. But if blk_throtl_init() return error and queue init
fail, blkcg_iolatency_exit() will not do that for us. Then it cause
memory leak.

Fixes: d70675121546 ("block: introduce blk-iolatency io controller")
Signed-off-by: Yufen Yu <yuyufen@huawei.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
block/blk-cgroup.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 1eb8895be4c6b..0c7addcd19859 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -1219,13 +1219,15 @@ int blkcg_init_queue(struct request_queue *q)
if (preloaded)
radix_tree_preload_end();

- ret = blk_iolatency_init(q);
+ ret = blk_throtl_init(q);
if (ret)
goto err_destroy_all;

- ret = blk_throtl_init(q);
- if (ret)
+ ret = blk_iolatency_init(q);
+ if (ret) {
+ blk_throtl_exit(q);
goto err_destroy_all;
+ }
return 0;

err_destroy_all:
--
2.25.1