[PATCH 4.2 17/54] ipv6: Dont call with rt6_uncached_list_flush_dev

Greg Kroah-Hartman
2015-10-23T17:46:46Z

From: "Eric W. Biederman" <ebiederm@xmission.com>

[ Upstream commit e332bc67cf5e5e5b71a1aec9750d0791aac65183 ]

As originally written rt6_uncached_list_flush_dev makes no sense when
called with dev == NULL as it attempts to flush all uncached routes
regardless of network namespace when dev == NULL. Which is simply
incorrect behavior.

Furthermore at the point rt6_ifdown is called with dev == NULL no more
network devices exist in the network namespace so even if the code in
rt6_uncached_list_flush_dev were to attempt something sensible it
would be meaningless.

Therefore remove support in rt6_uncached_list_flush_dev for handling
network devices where dev == NULL, and only call rt6_uncached_list_flush_dev
when rt6_ifdown is called with a network device.

Fixes: 8d0b94afdca8 ("ipv6: Keep track of DST_NOCACHE routes in case of iface down/unregister")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Reviewed-by: Martin KaFai Lau <kafai@fb.com>
Tested-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/ipv6/route.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)

--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -139,6 +139,9 @@ static void rt6_uncached_list_flush_dev(
struct net_device *loopback_dev = net->loopback_dev;
int cpu;

+ if (dev == loopback_dev)
+ return;
+
for_each_possible_cpu(cpu) {
struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
struct rt6_info *rt;
@@ -148,14 +151,12 @@ static void rt6_uncached_list_flush_dev(
struct inet6_dev *rt_idev = rt->rt6i_idev;
struct net_device *rt_dev = rt->dst.dev;

- if (rt_idev && (rt_idev->dev == dev || !dev) &&
- rt_idev->dev != loopback_dev) {
+ if (rt_idev->dev == dev) {
rt->rt6i_idev = in6_dev_get(loopback_dev);
in6_dev_put(rt_idev);
}

- if (rt_dev && (rt_dev == dev || !dev) &&
- rt_dev != loopback_dev) {
+ if (rt_dev == dev) {
rt->dst.dev = loopback_dev;
dev_hold(rt->dst.dev);
dev_put(rt_dev);
@@ -2577,7 +2578,8 @@ void rt6_ifdown(struct net *net, struct

fib6_clean_all(net, fib6_ifdown, &adn);
icmp6_clean_all(fib6_ifdown, &adn);
- rt6_uncached_list_flush_dev(net, dev);
+ if (dev)
+ rt6_uncached_list_flush_dev(net, dev);
}

struct rt6_mtu_change_arg {