netdev - [PATCH net 0/3] net/sched Bind logic fixes for cls_fw, cls_u32 and cls

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Message-Id: <20230721174856.3045-1-sec@valis.email>
Date: Fri, 21 Jul 2023 17:48:53 +0000
From: valis <sec@...is.email>
To: netdev@...r.kernel.org
Cc: jhs@...atatu.com,
	xiyou.wangcong@...il.com,
	jiri@...nulli.us,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	pctammela@...atatu.com,
	victor@...atatu.com,
	ramdhan@...rlabs.sg,
	billy@...rlabs.sg
Subject: [PATCH net 0/3] net/sched Bind logic fixes for cls_fw, cls_u32 and cls_route

Three classifiers (cls_fw, cls_u32 and cls_route) always copy 
tcf_result struct into the new instance of the filter on update.

This causes a problem when updating a filter bound to a class,
as tcf_unbind_filter() is always called on the old instance in the 
success path, decreasing filter_cnt of the still referenced class 
and allowing it to be deleted, leading to a use-after-free.

This patch set fixes this issue in all affected classifiers by no longer
copying the tcf_result struct from the old filter.

valis (3):
  net/sched: cls_u32: No longer copy tcf_result on update to avoid
    use-after-free
  net/sched: cls_fw: No longer copy tcf_result on update to avoid
    use-after-free
  net/sched: cls_route: No longer copy tcf_result on update to avoid
    use-after-free

 net/sched/cls_fw.c    | 1 -
 net/sched/cls_route.c | 1 -
 net/sched/cls_u32.c   | 1 -
 3 files changed, 3 deletions(-)

-- 
2.30.2