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Date:   Sun, 4 Oct 2020 14:50:58 +0000
From:   "Varghese, Martin (Nokia - IN/Bangalore)" <>
To:     Guillaume Nault <>,
        David Miller <>,
        Jakub Kicinski <>
CC:     "" <>,
        Davide Caratti <>
Subject: RE: [PATCH net] net/core: check length before updating Ethertype in

On Fri, 2020-10-02 at 21:53 +0200, Guillaume Nault wrote:
> Openvswitch allows to drop a packet's Ethernet header, therefore
>skb_mpls_push() and skb_mpls_pop() might be called with ethernet=true and mac_len=0. In that case the pointer passed to skb_mod_eth_type()     >doesn't point to an Ethernet header and the new Ethertype is written at unexpected locations.

>Fix this by verifying that mac_len is big enough to contain an Ethernet header.

>Fixes: fa4e0f8855fc ("net/sched: fix corrupted L2 header with MPLS 'push' and 'pop' actions")
>Signed-off-by: Guillaume Nault <>

Is this check redundant. I believe Openvswitch already takes care of it ?

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