Unverified Commit 4a0348cc authored by openeuler-ci-bot's avatar openeuler-ci-bot Committed by Gitee
Browse files

!14602 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/XUFZLCXU36RDFU7H77ST44SMDL257VQK/ 
 
https://gitee.com/src-openeuler/kernel/issues/IBEAKO 
 
Link:https://gitee.com/openeuler/kernel/pulls/14602

 

Reviewed-by: default avatarZhang Peng <zhangpeng362@huawei.com>
Signed-off-by: default avatarZhang Peng <zhangpeng362@huawei.com>
parents 396d5e2b dd81c5fe

block/blk-cgroup.c

+5 −1
Original line number Diff line number Diff line
@@ -1325,10 +1325,14 @@ void blkcg_unpin_online(struct cgroup_subsys_state *blkcg_css) 
	struct blkcg *blkcg = css_to_blkcg(blkcg_css);



	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);

}