Commit b7aba372 authored by WANG Cong's avatar WANG Cong Committed by Ben Hutchings

ipv6: avoid unregistering inet6_dev for loopback

commit 60abc0be upstream.

The per netns loopback_dev->ip6_ptr is unregistered and set to
NULL when its mtu is set to smaller than IPV6_MIN_MTU, this
leads to that we could set rt->rt6i_idev NULL after a
rt6_uncached_list_flush_dev() and then crash after another
call.

In this case we should just bring its inet6_dev down, rather
than unregistering it, at least prior to commit 176c39af
("netns: fix addrconf_ifdown kernel panic") we always
override the case for loopback.

Thanks a lot to Andrey for finding a reliable reproducer.

Fixes: 176c39af ("netns: fix addrconf_ifdown kernel panic")
Reported-by: default avatarAndrey Konovalov <andreyknvl@google.com>
Cc: Andrey Konovalov <andreyknvl@google.com>
Cc: Daniel Lezcano <dlezcano@fr.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Signed-off-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
Acked-by: default avatarDavid Ahern <dsahern@gmail.com>
Tested-by: default avatarAndrey Konovalov <andreyknvl@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
[bwh: Backported to 3.16: the NETDEV_CHANGEMTU case used to fall-through to the
 NETDEV_DOWN case here, so replace that with a separate call to addrconf_ifdown()]
Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
parent 29530235
......@@ -2823,6 +2823,7 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
{
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
struct inet6_dev *idev = __in6_dev_get(dev);
struct net *net = dev_net(dev);
int run_pending = 0;
int err;
......@@ -2916,7 +2917,7 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
* IPV6_MIN_MTU stop IPv6 on this interface.
*/
if (dev->mtu < IPV6_MIN_MTU)
addrconf_ifdown(dev, 1);
addrconf_ifdown(dev, dev != net->loopback_dev);
}
break;
......@@ -2937,6 +2938,8 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
* if MTU under IPV6_MIN_MTU.
* Stop IPv6 on this interface.
*/
addrconf_ifdown(dev, dev != net->loopback_dev);
break;
case NETDEV_DOWN:
case NETDEV_UNREGISTER:
......
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