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Subject[patch 74/86] Staging: asus_oled: fix NULL-ptr crash on unloading
3.2-stable review patch.  If anyone has any objections, please let me know.

------------------
From: Pekka Paalanen <pq@iki.fi>

commit 3589e74595a4332ebf77b5ed006f3c6686071ecd upstream.

Asus_oled triggers the following bug on module unloading:

usbcore: deregistering interface driver asus-oled
BUG: unable to handle kernel NULL pointer dereference at 0000000000000038
IP: [<ffffffff8111292b>] sysfs_delete_link+0x30/0x66
Call Trace:
[<ffffffff81225373>] device_remove_class_symlinks+0x6b/0x70
[<ffffffff812256a8>] device_del+0x9f/0x1ab
[<ffffffff812257c5>] device_unregister+0x11/0x1e
[<ffffffffa000cb82>] asus_oled_disconnect+0x4f/0x9e [asus_oled]
[<ffffffff81277430>] usb_unbind_interface+0x54/0x103
[<ffffffff812276c4>] __device_release_driver+0xa2/0xeb
[<ffffffff81227794>] driver_detach+0x87/0xad
[<ffffffff812269e9>] bus_remove_driver+0x91/0xc1
[<ffffffff81227fb4>] driver_unregister+0x66/0x6e
[<ffffffff812771ed>] usb_deregister+0xbb/0xc4
[<ffffffffa000ce87>] asus_oled_exit+0x2f/0x31 [asus_oled]
[<ffffffff81068365>] sys_delete_module+0x1b8/0x21b
[<ffffffff810ae3de>] ? do_munmap+0x2ef/0x313
[<ffffffff813699bb>] system_call_fastpath+0x16/0x1b
This is due to an incorrect destruction sequence in asus_oled_exit().

Fix the order, fixes the bug. Tested on an Asus G50V laptop only.

Cc: Jakub Schmidtke <sjakub@gmail.com>
Signed-off-by: Pekka Paalanen <pq@iki.fi>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/staging/asus_oled/asus_oled.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
--- a/drivers/staging/asus_oled/asus_oled.c
+++ b/drivers/staging/asus_oled/asus_oled.c
@@ -811,10 +811,9 @@ error:

static void __exit asus_oled_exit(void)
{
+ usb_deregister(&oled_driver);
class_remove_file(oled_class, &class_attr_version.attr);
class_destroy(oled_class);
-
- usb_deregister(&oled_driver);
}

module_init(asus_oled_init);



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