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Date:   Tue, 9 Aug 2022 15:11:44 -0400
From:   Jamal Hadi Salim <>
To:     Thadeu Lima de Souza Cascardo <>
Cc:, Cong Wang <>,
        Jiri Pirko <>,
        Zhenpeng Lin <>,
        Kamal Mostafa <>,
Subject: Re: [PATCH] net_sched: cls_route: remove from list when handle is 0

On Tue, Aug 9, 2022 at 1:06 PM Thadeu Lima de Souza Cascardo
<> wrote:
> When a route filter is replaced and the old filter has a 0 handle, the old
> one won't be removed from the hashtable, while it will still be freed.
> The test was there since before commit 1109c00547fc ("net: sched: RCU
> cls_route"), when a new filter was not allocated when there was an old one.
> The old filter was reused and the reinserting would only be necessary if an
> old filter was replaced. That was still wrong for the same case where the
> old handle was 0.
> Remove the old filter from the list independently from its handle value.
> This fixes CVE-2022-2588, also reported as ZDI-CAN-17440.
> Reported-by: Zhenpeng Lin <>
> Signed-off-by: Thadeu Lima de Souza Cascardo <>
> Reviewed-by: Kamal Mostafa <>
> Cc: <>
> Cc: Jamal Hadi Salim <>

Acked-by: Jamal Hadi Salim <>


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