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    Subject[PATCH 5.10 031/130] vrf: Reset IPCB/IP6CB when processing outbound pkts in vrf dev xmit
    Date
    From: Stephen Suryaputra <ssuryaextr@gmail.com>

    commit ee201011c1e1563c114a55c86eb164b236f18e84 upstream.

    IPCB/IP6CB need to be initialized when processing outbound v4 or v6 pkts
    in the codepath of vrf device xmit function so that leftover garbage
    doesn't cause futher code that uses the CB to incorrectly process the
    pkt.

    One occasion of the issue might occur when MPLS route uses the vrf
    device as the outgoing device such as when the route is added using "ip
    -f mpls route add <label> dev <vrf>" command.

    The problems seems to exist since day one. Hence I put the day one
    commits on the Fixes tags.

    Fixes: 193125dbd8eb ("net: Introduce VRF device driver")
    Fixes: 35402e313663 ("net: Add IPv6 support to VRF device")
    Cc: stable@vger.kernel.org
    Signed-off-by: Stephen Suryaputra <ssuryaextr@gmail.com>
    Reviewed-by: David Ahern <dsahern@kernel.org>
    Link: https://lore.kernel.org/r/20211130162637.3249-1-ssuryaextr@gmail.com
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/net/vrf.c | 2 ++
    1 file changed, 2 insertions(+)

    --- a/drivers/net/vrf.c
    +++ b/drivers/net/vrf.c
    @@ -497,6 +497,7 @@ static netdev_tx_t vrf_process_v6_outbou
    /* strip the ethernet header added for pass through VRF device */
    __skb_pull(skb, skb_network_offset(skb));

    + memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
    ret = vrf_ip6_local_out(net, skb->sk, skb);
    if (unlikely(net_xmit_eval(ret)))
    dev->stats.tx_errors++;
    @@ -580,6 +581,7 @@ static netdev_tx_t vrf_process_v4_outbou
    RT_SCOPE_LINK);
    }

    + memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
    ret = vrf_ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
    if (unlikely(net_xmit_eval(ret)))
    vrf_dev->stats.tx_errors++;

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