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net: mpls: netconf: perform strict checks also for doit handlers

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Make RTM_GETNETCONF's doit handler use strict checks when
NETLINK_F_STRICT_CHK is set.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2019-01-18 10:46:26 -08:00 committed by David S. Miller
parent d77851bf68
commit 0c4056ee84
1 changed files with 39 additions and 3 deletions
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42
net/mpls/af_mpls.c
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@ -1209,21 +1209,57 @@ static const struct nla_policy devconf_mpls_policy[NETCONFA_MAX + 1] = {
[NETCONFA_IFINDEX] = { .len = sizeof(int) },
};
static int mpls_netconf_valid_get_req(struct sk_buff *skb,
const struct nlmsghdr *nlh,
struct nlattr **tb,
struct netlink_ext_ack *extack)
{
int i, err;
if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
NL_SET_ERR_MSG_MOD(extack,
"Invalid header for netconf get request");
return -EINVAL;
}
if (!netlink_strict_get_check(skb))
return nlmsg_parse(nlh, sizeof(struct netconfmsg), tb,
NETCONFA_MAX, devconf_mpls_policy, extack);
err = nlmsg_parse_strict(nlh, sizeof(struct netconfmsg), tb,
NETCONFA_MAX, devconf_mpls_policy, extack);
if (err)
return err;
for (i = 0; i <= NETCONFA_MAX; i++) {
if (!tb[i])
continue;
switch (i) {
case NETCONFA_IFINDEX:
break;
default:
NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
return -EINVAL;
}
}
return 0;
}
static int mpls_netconf_get_devconf(struct sk_buff *in_skb,
struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
struct net *net = sock_net(in_skb->sk);
struct nlattr *tb[NETCONFA_MAX + 1];
struct netconfmsg *ncm;
struct net_device *dev;
struct mpls_dev *mdev;
struct sk_buff *skb;
int ifindex;
int err;
err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
devconf_mpls_policy, extack);
err = mpls_netconf_valid_get_req(in_skb, nlh, tb, extack);
if (err < 0)
goto errout;