Commit 96f80d12 authored Jul 15, 2012 by Sjur Brændeland Committed by David S. Miller Jul 16, 2012

caif: Fix access to freed pernet memory



unregister_netdevice_notifier() must be called before
unregister_pernet_subsys() to avoid accessing already freed
pernet memory. This fixes the following oops when doing rmmod:

Call Trace:
 [<ffffffffa0f802bd>] caif_device_notify+0x4d/0x5a0 [caif]
 [<ffffffff81552ba9>] unregister_netdevice_notifier+0xb9/0x100
 [<ffffffffa0f86dcc>] caif_device_exit+0x1c/0x250 [caif]
 [<ffffffff810e7734>] sys_delete_module+0x1a4/0x300
 [<ffffffff810da82d>] ? trace_hardirqs_on_caller+0x15d/0x1e0
 [<ffffffff813517de>] ? trace_hardirqs_on_thunk+0x3a/0x3
 [<ffffffff81696bad>] system_call_fastpath+0x1a/0x1f

RIP
 [<ffffffffa0f7f561>] caif_get+0x51/0xb0 [caif]

Signed-off-by: Sjur Brændeland <sjur.brandeland@stericsson.com>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent ef209f15

net/caif/caif_dev.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -561,9 +561,9 @@ static int __init caif_device_init(void)

		static void __exit caif_device_exit(void)
		{
		unregister_pernet_subsys(&caif_net_ops);
		unregister_netdevice_notifier(&caif_device_notifier);
		dev_remove_pack(&caif_packet_type);
		unregister_pernet_subsys(&caif_net_ops);
		}

		module_init(caif_device_init);

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