This is a note to let you know that I've just added the patch titled
ipv6: avoid unregistering inet6_dev for loopback
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ipv6-avoid-unregistering-inet6_dev-for-loopback.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 60abc0be96e00ca71bac083215ac91ad2e575096 Mon Sep 17 00:00:00 2001
From: WANG Cong <xiyou.wangcong@xxxxxxxxx>
Date: Wed, 21 Jun 2017 14:34:58 -0700
Subject: ipv6: avoid unregistering inet6_dev for loopback
From: WANG Cong <xiyou.wangcong@xxxxxxxxx>
commit 60abc0be96e00ca71bac083215ac91ad2e575096 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 176c39af29bc
("netns: fix addrconf_ifdown kernel panic") we always
override the case for loopback.
Thanks a lot to Andrey for finding a reliable reproducer.
Fixes: 176c39af29bc ("netns: fix addrconf_ifdown kernel panic")
Reported-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Cc: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Cc: Daniel Lezcano <dlezcano@xxxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Signed-off-by: Cong Wang <xiyou.wangcong@xxxxxxxxx>
Acked-by: David Ahern <dsahern@xxxxxxxxx>
Tested-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/ipv6/addrconf.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -3143,6 +3143,7 @@ static int addrconf_notify(struct notifi
{
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;
@@ -3158,7 +3159,7 @@ static int addrconf_notify(struct notifi
case NETDEV_CHANGEMTU:
/* if MTU under 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;
}
@@ -3271,7 +3272,7 @@ static int addrconf_notify(struct notifi
* 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;
Patches currently in stable-queue which might be from xiyou.wangcong@xxxxxxxxx are
queue-4.4/ipv6-avoid-unregistering-inet6_dev-for-loopback.patch
queue-4.4/tcp-reset-sk_rx_dst-in-tcp_disconnect.patch