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Diffstat (limited to 'net/core/rtnetlink.c')
-rw-r--r--net/core/rtnetlink.c25
1 files changed, 19 insertions, 6 deletions
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index e170179cc66f..2bd9c5f7627d 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -722,6 +722,21 @@ static struct net *get_net_ns_by_pid(pid_t pid)
return net;
}
+static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
+{
+ if (dev) {
+ if (tb[IFLA_ADDRESS] &&
+ nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
+ return -EINVAL;
+
+ if (tb[IFLA_BROADCAST] &&
+ nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
struct nlattr **tb, char *ifname, int modified)
{
@@ -894,12 +909,7 @@ static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
goto errout;
}
- if (tb[IFLA_ADDRESS] &&
- nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
- goto errout_dev;
-
- if (tb[IFLA_BROADCAST] &&
- nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
+ if ((err = validate_linkmsg(dev, tb)) < 0)
goto errout_dev;
err = do_setlink(dev, ifm, tb, ifname, 0);
@@ -1020,6 +1030,9 @@ replay:
else
dev = NULL;
+ if ((err = validate_linkmsg(dev, tb)) < 0)
+ return err;
+
if (tb[IFLA_LINKINFO]) {
err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
tb[IFLA_LINKINFO], ifla_info_policy);