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>
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@ -1077,12 +1077,16 @@ static int inetdev_event(struct notifier_block *this, unsigned long event,
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ip_mc_up(in_dev);
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/* fall through */
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case NETDEV_CHANGEADDR:
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if (IN_DEV_ARP_NOTIFY(in_dev))
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arp_send(ARPOP_REQUEST, ETH_P_ARP,
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in_dev->ifa_list->ifa_address,
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dev,
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in_dev->ifa_list->ifa_address,
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NULL, dev->dev_addr, NULL);
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/* Send gratuitous ARP to notify of link change */
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if (IN_DEV_ARP_NOTIFY(in_dev)) {
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struct in_ifaddr *ifa = in_dev->ifa_list;
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if (ifa)
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arp_send(ARPOP_REQUEST, ETH_P_ARP,
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ifa->ifa_address, dev,
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ifa->ifa_address, NULL,
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dev->dev_addr, NULL);
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}
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break;
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case NETDEV_DOWN:
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ip_mc_down(in_dev);
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