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Date:   Tue, 5 Feb 2019 10:42:38 +0100
From:   Jiri Pirko <>
To:     Vlad Buslov <>
Subject: Re: [PATCH net-next v3 05/16] net: sched: protect chain template
 accesses with block lock

Mon, Feb 04, 2019 at 01:32:50PM CET, wrote:
>When cls API is called without protection of rtnl lock, parallel
>modification of chain is possible, which means that chain template can be
>changed concurrently in certain circumstances. For example, when chain is
>'deleted' by new user-space chain API, the chain might continue to be used
>if it is referenced by actions, and can be 're-created' again by user. In
>such case same chain structure is reused and its template is changed. To
>protect from described scenario, cache chain template while holding block
>lock. Introduce standalone tc_chain_notify_delete() function that works
>with cached template values, instead of chains themselves.
>Signed-off-by: Vlad Buslov <>

Acked-by: Jiri Pirko <>

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