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    Subject[PATCH 4.20 53/76] mpls: Return error for RTA_GATEWAY attribute
    Date
    4.20-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: David Ahern <dsahern@gmail.com>

    [ Upstream commit be48220edd48ca0d569782992840488a52373a24 ]

    MPLS does not support nexthops with an MPLS address family.
    Specifically, it does not handle RTA_GATEWAY attribute. Make it
    clear by returning an error.

    Fixes: 03c0566542f4c ("mpls: Netlink commands to add, remove, and dump routes")
    Signed-off-by: David Ahern <dsahern@gmail.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    net/mpls/af_mpls.c | 3 +++
    1 file changed, 3 insertions(+)

    --- a/net/mpls/af_mpls.c
    +++ b/net/mpls/af_mpls.c
    @@ -1838,6 +1838,9 @@ static int rtm_to_route_config(struct sk
    goto errout;
    break;
    }
    + case RTA_GATEWAY:
    + NL_SET_ERR_MSG(extack, "MPLS does not support RTA_GATEWAY attribute");
    + goto errout;
    case RTA_VIA:
    {
    if (nla_get_via(nla, &cfg->rc_via_alen,

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