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| author | Sjur Brændeland <sjur.brandeland@stericsson.com> | 2012-07-15 10:10:14 +0000 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2012-08-19 18:15:22 +0100 |
| commit | 9fbc36b812a7f55972682b4b175d2284f487df77 (patch) | |
| tree | abf3c69cc690c31238e954f14597df87df9889a4 | |
| parent | e44b8b47d096751cb15a81b4c0f83a05fc1f49c8 (diff) | |
| download | lwn-9fbc36b812a7f55972682b4b175d2284f487df77.tar.gz lwn-9fbc36b812a7f55972682b4b175d2284f487df77.zip | |
caif: Fix access to freed pernet memory
[ Upstream commit 96f80d123eff05c3cd4701463786b87952a6c3ac ]
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>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
| -rw-r--r-- | net/caif/caif_dev.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/caif/caif_dev.c b/net/caif/caif_dev.c index 68223e4c4bf0..4e9115d593a5 100644 --- a/net/caif/caif_dev.c +++ b/net/caif/caif_dev.c @@ -428,9 +428,9 @@ 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); |