netdev - Re: [PATCH] net: sched: use temporary variable for actions indexes

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Message-ID: <20190801133947.GA32368@mellanox.com>
Date:   Thu, 1 Aug 2019 13:39:49 +0000
From:   Dmytro Linkin <dmitrolin@...lanox.com>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, jiri@...nulli.us, jhs@...atatu.com,
        xiyou.wangcong@...il.com, Vlad Buslov <vladbu@...lanox.com>
Subject: Re: [PATCH] net: sched: use temporary variable for actions indexes

On Thu, Aug 01, 2019 at 01:02:51PM +0000, dmitrolin@...lanox.com wrote:
> From: Dmytro Linkin <dmitrolin@...lanox.com>
> 
> Currently init call of all actions (except ipt) init their 'parm'
> structure as a direct pointer to nla data in skb. This leads to race
> condition when some of the filter actions were initialized successfully
> (and were assigned with idr action index that was written directly
> into nla data), but then were deleted and retried (due to following
> action module missing or classifier-initiated retry), in which case
> action init code tries to insert action to idr with index that was
> assigned on previous iteration. During retry the index can be reused
> by another action that was inserted concurrently, which causes
> unintended action sharing between filters.
> To fix described race condition, save action idr index to temporary
> stack-allocated variable instead on nla data.
> 
> Fixes: 0190c1d452a9 ("net: sched: atomically check-allocate action")
> Signed-off-by: Dmytro Linkin <dmitrolin@...lanox.com>
> Signed-off-by: Vlad Buslov <vladbu@...lanox.com>
> ---

Hi,
Forgot to add target branch - net

Sincerely,
Dmytro