ipv4: Flush per-ns routing cache more sanely.

Flush the routing cache only of entries that match the
network namespace in which the purge event occurred.

Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index d3a1112b9d9..9f8bb68911e 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -987,7 +987,11 @@ static int fib_netdev_event(struct notifier_block *this, unsigned long event, vo
                 rt_cache_flush(dev_net(dev), 0);
                 break;
         case NETDEV_UNREGISTER_BATCH:
-                rt_cache_flush_batch();
+                /* The batch unregister is only called on the first
+                 * device in the list of devices being unregistered.
+                 * Therefore we should not pass dev_net(dev) in here.
+                 */
+                rt_cache_flush_batch(NULL);
                 break;
         }
         return NOTIFY_DONE;