ipv6: Don't call with rt6_uncached_list_flush_dev

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>

1 files changed, 7 insertions, 5 deletions

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index cb32ce250db0..ed04e29a6aa3 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -142,6 +142,9 @@ static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *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;
@@ -151,14 +154,12 @@ static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *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);
@@ -2622,7 +2623,8 @@ void rt6_ifdown(struct net *net, struct net_device *dev)
 
         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 {