diff options
| author | Jakub Kicinski <jakub.kicinski@netronome.com> | 2019-01-18 10:46:26 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-01-19 10:09:59 -0800 |
| commit | 0c4056ee8433487cfcc19621b85586c88ec927c0 (patch) | |
| tree | 706b013a6ff1715d81bd3054721a8ecdaf9aa16d | |
| parent | d77851bf68f48430a136af433783763ea7a35c3a (diff) | |
| download | linux-0c4056ee8433487cfcc19621b85586c88ec927c0.tar.bz2 | |
net: mpls: netconf: perform strict checks also for doit handlers
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>
| -rw-r--r-- | net/mpls/af_mpls.c | 42 |
1 files changed, 39 insertions, 3 deletions
diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c index 733c86db551b..2662a23c658e 100644 --- a/net/mpls/af_mpls.c +++ b/net/mpls/af_mpls.c @@ -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; |