aboutsummaryrefslogtreecommitdiff
path: root/net/core/rtnetlink.c
diff options
context:
space:
mode:
authorThomas Graf <tgraf@suug.ch>2008-02-23 19:54:36 -0800
committerDavid S. Miller <davem@davemloft.net>2008-02-23 19:54:36 -0800
commit1840bb13c22f5b8fd2e242e36c8d6ea3f312be67 (patch)
tree3bf1c4276a409b2984607b683c6d8d44fccaeed7 /net/core/rtnetlink.c
parent759afc31332aed66bde20743e7e2d1e47b08aaeb (diff)
downloadlinux-stericsson-1840bb13c22f5b8fd2e242e36c8d6ea3f312be67.tar.gz
[RTNL]: Validate hardware and broadcast address attribute for RTM_NEWLINK
RTM_NEWLINK allows for already existing links to be modified. For this purpose do_setlink() is called which expects address attributes with a payload length of at least dev->addr_len. This patch adds the necessary validation for the RTM_NEWLINK case. The address length for links to be created is not checked for now as the actual attribute length is used when copying the address to the netdevice structure. It might make sense to report an error if less than addr_len bytes are provided but enforcing this might break drivers trying to be smart with not transmitting all zero addresses. Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
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);