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authorDavid S. Miller <davem@davemloft.net>2016-03-13 23:28:00 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-04-20 15:42:03 +0900
commit54789759917f127cfadcca730f44ea67d557a9b0 (patch)
tree939e0f0561270b3e38772bb348e91d075599c0c0 /net/ipv4/devinet.c
parentacbea202fbba11c52df2fd4040c19bb796fd37fa (diff)
ipv4: Don't do expensive useless work during inetdev destroy.
[ Upstream commit fbd40ea0180a2d328c5adc61414dc8bab9335ce2 ] When an inetdev is destroyed, every address assigned to the interface is removed. And in this scenerio we do two pointless things which can be very expensive if the number of assigned interfaces is large: 1) Address promotion. We are deleting all addresses, so there is no point in doing this. 2) A full nf conntrack table purge for every address. We only need to do this once, as is already caught by the existing masq_dev_notifier so masq_inet_event() can skip this. Reported-by: Solar Designer <solar@openwall.com> Signed-off-by: David S. Miller <davem@davemloft.net> Tested-by: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/ipv4/devinet.c')
-rw-r--r--net/ipv4/devinet.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index f6303b17546b..0212591b0077 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -334,6 +334,9 @@ static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
ASSERT_RTNL();
+ if (in_dev->dead)
+ goto no_promotions;
+
/* 1. Deleting primary ifaddr forces deletion all secondaries
* unless alias promotion is set
**/
@@ -380,6 +383,7 @@ static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
fib_del_ifaddr(ifa, ifa1);
}
+no_promotions:
/* 2. Unlink it */
*ifap = ifa1->ifa_next;