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-rw-r--r--net/ipv6/route.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 2e44900..0488a24c 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -3730,7 +3730,11 @@ static int ip6_route_dev_notify(struct notifier_block *this,
net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
#endif
- } else if (event == NETDEV_UNREGISTER) {
+ } else if (event == NETDEV_UNREGISTER &&
+ dev->reg_state != NETREG_UNREGISTERED) {
+ /* NETDEV_UNREGISTER could be fired for multiple times by
+ * netdev_wait_allrefs(). Make sure we only call this once.
+ */
in6_dev_put(net->ipv6.ip6_null_entry->rt6i_idev);
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
in6_dev_put(net->ipv6.ip6_prohibit_entry->rt6i_idev);
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