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Date:   Mon, 09 Mar 2020 18:02:52 -0700 (PDT)
From:   David Miller <>
Subject: Re: [PATCH net] macvlan: add cond_resched() during multicast

From: Mahesh Bandewar <>
Date: Mon,  9 Mar 2020 15:57:07 -0700

> The Rx bound multicast packets are deferred to a workqueue and
> macvlan can also suffer from the same attack that was discovered
> by Syzbot for IPvlan. This solution is not as effective as in
> IPvlan. IPvlan defers all (Tx and Rx) multicast packet processing
> to a workqueue while macvlan does this way only for the Rx. This
> fix should address the Rx codition to certain extent.
> Tx is still suseptible. Tx multicast processing happens when
> .ndo_start_xmit is called, hence we cannot add cond_resched().
> However, it's not that severe since the user which is generating
>  / flooding will be affected the most.
> Fixes: 412ca1550cbe ("macvlan: Move broadcasts into a work queue")
> Signed-off-by: Mahesh Bandewar <>

Applied and queued up for -stable.

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