netdev - Re: [PATCH net] net/sched: act_tunnel_key: fix OOB write in case of IPv6 ERSPAN tunnels

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Date:   Tue, 20 Oct 2020 17:33:22 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Davide Caratti <dcaratti@...hat.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jiri Pirko <jiri@...nulli.us>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Simon Horman <simon.horman@...ronome.com>,
        Shuang Li <shuali@...hat.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [PATCH net] net/sched: act_tunnel_key: fix OOB write in case of
 IPv6 ERSPAN tunnels

On Tue, Oct 20, 2020 at 3:03 PM Davide Caratti <dcaratti@...hat.com> wrote:
>
> the following command
>
>  # tc action add action tunnel_key \
>  > set src_ip 2001:db8::1 dst_ip 2001:db8::2 id 10 erspan_opts 1:6789:0:0
>
> generates the following splat:
...
> using IPv6 tunnels, act_tunnel_key allocates a fixed amount of memory for
> the tunnel metadata, but then it expects additional bytes to store tunnel
> specific metadata with tunnel_key_copy_opts().
>
> Fix the arguments of __ipv6_tun_set_dst(), so that 'md_size' contains the
> size previously computed by tunnel_key_get_opts_len(), like it's done for
> IPv4 tunnels.

Acked-by: Cong Wang <xiyou.wangcong@...il.com>

Thanks.