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authorJakub Kicinski <jakub.kicinski@netronome.com>2019-01-18 10:46:26 -0800
committerDavid S. Miller <davem@davemloft.net>2019-01-19 10:09:59 -0800
commit0c4056ee8433487cfcc19621b85586c88ec927c0 (patch)
tree706b013a6ff1715d81bd3054721a8ecdaf9aa16d /net/mpls
parentd77851bf68f48430a136af433783763ea7a35c3a (diff)
downloadlinux-stericsson-0c4056ee8433487cfcc19621b85586c88ec927c0.tar.gz
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>
Diffstat (limited to 'net/mpls')
-rw-r--r--net/mpls/af_mpls.c42
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;