diff options
Diffstat (limited to 'net/ipv6')
| -rw-r--r-- | net/ipv6/addrconf.c | 49 |
1 files changed, 47 insertions, 2 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index 93d5ad2b1a69..339a82cfe5f2 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -5179,6 +5179,52 @@ static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) return inet6_dump_addr(skb, cb, type); } +static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb, + const struct nlmsghdr *nlh, + struct nlattr **tb, + struct netlink_ext_ack *extack) +{ + struct ifaddrmsg *ifm; + int i, err; + + if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { + NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request"); + return -EINVAL; + } + + ifm = nlmsg_data(nlh); + if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { + NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request"); + return -EINVAL; + } + + if (!netlink_strict_get_check(skb)) + return nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, + ifa_ipv6_policy, extack); + + err = nlmsg_parse_strict(nlh, sizeof(*ifm), tb, IFA_MAX, + ifa_ipv6_policy, extack); + if (err) + return err; + + for (i = 0; i <= IFA_MAX; i++) { + if (!tb[i]) + continue; + + switch (i) { + case IFA_TARGET_NETNSID: + case IFA_ADDRESS: + case IFA_LOCAL: + break; + default: + NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request"); + return -EINVAL; + } + } + + return 0; +} + static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, struct netlink_ext_ack *extack) { @@ -5199,8 +5245,7 @@ static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, struct sk_buff *skb; int err; - err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, - extack); + err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack); if (err < 0) return err; |