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    Subject[PATCH 3.13.y-ckt 92/96] rtnetlink: release net refcnt on error in do_setlink()
    Date
    3.13.11-ckt13 -stable review patch.  If anyone has any objections, please let me know.

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

    From: Nicolas Dichtel <nicolas.dichtel@6wind.com>

    [ Upstream commit e0ebde0e131b529fd721b24f62872def5ec3718c ]

    rtnl_link_get_net() holds a reference on the 'struct net', we need to release
    it in case of error.

    CC: Eric W. Biederman <ebiederm@xmission.com>
    Fixes: b51642f6d77b ("net: Enable a userns root rtnl calls that are safe for unprivilged users")
    Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
    Reviewed-by: "Eric W. Biederman" <ebiederm@xmission.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Kamal Mostafa <kamal@canonical.com>
    ---
    net/core/rtnetlink.c | 1 +
    1 file changed, 1 insertion(+)

    diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
    index 8463178..7dca4b4 100644
    --- a/net/core/rtnetlink.c
    +++ b/net/core/rtnetlink.c
    @@ -1391,6 +1391,7 @@ static int do_setlink(const struct sk_buff *skb,
    goto errout;
    }
    if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) {
    + put_net(net);
    err = -EPERM;
    goto errout;
    }
    --
    1.9.1


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