netdev - [PATCH net v2 0/3] net/sched Bind logic fixes for cls_fw, cls_u32 and cls

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Date: Sat, 29 Jul 2023 08:31:59 -0400
From: Jamal Hadi Salim <jhs@...atatu.com>
To: davem@...emloft.net,
	kuba@...nel.org,
	edumazet@...gle.com,
	pabeni@...hat.com
Cc: jiri@...nulli.us,
	xiyou.wangcong@...il.com,
	netdev@...r.kernel.org,
	sec@...is.email,
	ramdhan@...rlabs.sg,
	billy@...rlabs.sg
Subject: [PATCH net v2 0/3] net/sched Bind logic fixes for cls_fw, cls_u32 and cls_route

From: valis <sec@...is.email>

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.

v1 -> v2:
   - Resubmission and SOB by Jamal

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(-)

--
2.34.1