Unverified Commit f032f68e authored by openeuler-ci-bot's avatar openeuler-ci-bot Committed by Gitee
Browse files

!14598 blk-cgroup: Fix UAF in blkcg_unpin_online() 

Merge Pull Request from: @ci-robot 
 
PR sync from: Yu Kuai <yukuai3@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/5WY2QC4ATH2JEXMA2SDREDVGNOGESVBB/ 
 
https://gitee.com/src-openeuler/kernel/issues/IBEAKO 
 
Link:https://gitee.com/openeuler/kernel/pulls/14598

 

Reviewed-by: default avatarLi Nan <linan122@huawei.com>
Signed-off-by: default avatarLi Nan <linan122@huawei.com>
parents 9be6ae39 99e417c4

include/linux/blk-cgroup.h

+5 −1
Original line number Diff line number Diff line
@@ -425,10 +425,14 @@ static inline void blkcg_pin_online(struct blkcg *blkcg) 
static inline void blkcg_unpin_online(struct blkcg *blkcg)

{

	do {

		struct blkcg *parent;



		if (!refcount_dec_and_test(&blkcg->online_pin))

			break;



		parent = blkcg_parent(blkcg);

		blkcg_destroy_blkgs(blkcg);

		blkcg = blkcg_parent(blkcg);

		blkcg = parent;

	} while (blkcg);

}