netdev - Re: [net-next PATCH v2] net/sched: cls

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Date:   Tue, 10 Aug 2021 10:41:34 +0300
From:   Ido Schimmel <idosch@...sch.org>
To:     Mark Bloch <mbloch@...dia.com>
Cc:     netdev@...r.kernel.org, xiyou.wangcong@...il.com,
        vladbu@...dia.com, cong.wang@...edance.com, jhs@...atatu.com,
        jiri@...nulli.us
Subject: Re: [net-next PATCH v2] net/sched: cls_api, reset flags on replay

On Tue, Aug 10, 2021 at 03:43:05AM +0000, Mark Bloch wrote:
> tc_new_tfilter() can replay a request if it got EAGAIN. The cited commit
> didn't account for this when it converted TC action ->init() API
> to use flags instead of parameters. This can lead to passing stale flags
> down the call chain which results in trying to lock rtnl when it's
> already locked, deadlocking the entire system.
> 
> Fix by making sure to reset flags on each replay.

[...]

> Fixes: 695176bfe5de ("net_sched: refactor TC action init API")
> Signed-off-by: Mark Bloch <mbloch@...dia.com>
> Reviewed-by: Vlad Buslov <vladbu@...dia.com>

Reviewed-by: Ido Schimmel <idosch@...dia.com>
Tested-by: Ido Schimmel <idosch@...dia.com>