From: Eric W. Biederman Date: Sun, 22 Feb 2009 08:09:14 +0000 (-0800) Subject: netns: Fix icmp shutdown. X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=959d2726499175c6b724d87fed1dafca7582efe2;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git 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 Acked-by: Denis V. Lunev Signed-off-by: David S. Miller --- diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c index 382800a62b31..3f50807237e0 100644 --- a/net/ipv4/icmp.c +++ b/net/ipv4/icmp.c @@ -1207,7 +1207,7 @@ 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);