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Diffstat (limited to 'net/ipv4/devinet.c')
-rw-r--r--net/ipv4/devinet.c18
1 files changed, 13 insertions, 5 deletions
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index 7602c79a389b..f38cbbae0ae3 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -1120,6 +1120,16 @@ static struct notifier_block ip_netdev_notifier = {
.notifier_call =inetdev_event,
};
+static inline size_t inet_nlmsg_size(void)
+{
+ return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
+ + nla_total_size(4) /* IFA_ADDRESS */
+ + nla_total_size(4) /* IFA_LOCAL */
+ + nla_total_size(4) /* IFA_BROADCAST */
+ + nla_total_size(4) /* IFA_ANYCAST */
+ + nla_total_size(IFNAMSIZ); /* IFA_LABEL */
+}
+
static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
u32 pid, u32 seq, int event, unsigned int flags)
{
@@ -1208,15 +1218,13 @@ static void rtmsg_ifa(int event, struct in_ifaddr* ifa, struct nlmsghdr *nlh,
u32 seq = nlh ? nlh->nlmsg_seq : 0;
int err = -ENOBUFS;
- skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+ skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
if (skb == NULL)
goto errout;
err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0);
- if (err < 0) {
- kfree_skb(skb);
- goto errout;
- }
+ /* failure implies BUG in inet_nlmsg_size() */
+ BUG_ON(err < 0);
err = rtnl_notify(skb, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
errout: