netdev - Re: [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 22:49:45 +0700
From: M A Ramdhan <ramdhan@...rlabs.sg>
To: Jamal Hadi Salim <jhs@...atatu.com>
Cc: davem@...emloft.net, kuba@...nel.org, edumazet@...gle.com, 
	pabeni@...hat.com, jiri@...nulli.us, xiyou.wangcong@...il.com, 
	netdev@...r.kernel.org, sec@...is.email, billy@...rlabs.sg
Subject: Re: [PATCH net v2 0/3] net/sched Bind logic fixes for cls_fw, cls_u32
 and cls_route

On Sat, Jul 29, 2023 at 7:32 PM Jamal Hadi Salim <jhs@...atatu.com> wrote:
>
> 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(-)
>
For the series,
Tested-by: M A Ramdhan <ramdhan@...rlabs.sg>
Reviewed-by: M A Ramdhan <ramdhan@...rlabs.sg>

> --
> 2.34.1