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authorEric W. Biederman <ebiederm@aristanetworks.com>2009-02-22 00:09:14 -0800
committerDavid S. Miller <davem@davemloft.net>2009-03-03 01:14:15 -0800
commit6eb0777228f31932fc941eafe8b08848466630a1 (patch)
tree41154f46d5a87add0e60cff21ebd2c88493813f0
parent176c39af29bc4edaf37f663553eeaacd47b5bc9c (diff)
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netns: Fix icmp shutdown.
Recently I had a kernel panic in icmp_send during a network namespace cleanup. There were packets in the arp queue that failed to be sent and we attempted to generate an ICMP host unreachable message, but failed because icmp_sk_exit had already been called. The network devices are removed from a network namespace and their arp queues are flushed before we do attempt to shutdown subsystems so this error should have been impossible. It turns out icmp_init is using register_pernet_device instead of register_pernet_subsys. Which resulted in icmp being shut down while we still had the possibility of packets in flight, making a nasty NULL pointer deference in interrupt context possible. Changing this to register_pernet_subsys fixes the problem in my testing. Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com> Acked-by: Denis V. Lunev <den@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/ipv4/icmp.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index 705b33b184a3..fc562d29cc46 100644
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -1205,7 +1205,7 @@ static struct pernet_operations __net_initdata icmp_sk_ops = {
int __init icmp_init(void)
{
- return register_pernet_device(&icmp_sk_ops);
+ return register_pernet_subsys(&icmp_sk_ops);
}
EXPORT_SYMBOL(icmp_err_convert);