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authorStephen Hemminger <shemminger@vyatta.com>2009-10-07 03:18:17 -0700
committerDavid S. Miller <davem@davemloft.net>2009-10-07 03:18:17 -0700
commita21090cff296eb82b6de09304d64de466bdcaefc (patch)
tree9fb1079548ed85e802c3cc46aa525ae51619e88c /net/ipv4
parent1cec9727fbfd7baff2034796154be1a0297bcedd (diff)
ipv4: arp_notify address list bug
This fixes a bug with arp_notify. If arp_notify is enabled, kernel will crash if address is changed and no IP address is assigned. http://bugzilla.kernel.org/show_bug.cgi?id=14330 Reported-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/devinet.c16
1 files changed, 10 insertions, 6 deletions
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index e92f1fd28aa5..5df2f6a0b0f0 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -1077,12 +1077,16 @@ static int inetdev_event(struct notifier_block *this, unsigned long event,
ip_mc_up(in_dev);
/* fall through */
case NETDEV_CHANGEADDR:
- if (IN_DEV_ARP_NOTIFY(in_dev))
- arp_send(ARPOP_REQUEST, ETH_P_ARP,
- in_dev->ifa_list->ifa_address,
- dev,
- in_dev->ifa_list->ifa_address,
- NULL, dev->dev_addr, NULL);
+ /* Send gratuitous ARP to notify of link change */
+ if (IN_DEV_ARP_NOTIFY(in_dev)) {
+ struct in_ifaddr *ifa = in_dev->ifa_list;
+
+ if (ifa)
+ arp_send(ARPOP_REQUEST, ETH_P_ARP,
+ ifa->ifa_address, dev,
+ ifa->ifa_address, NULL,
+ dev->dev_addr, NULL);
+ }
break;
case NETDEV_DOWN:
ip_mc_down(in_dev);