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Subjectusb/media/au0828: use-after-free in au0828_rc_unregister
Hi!

I've got the following report while fuzzing the kernel with syzkaller.

On commit 3e0cc09a3a2c40ec1ffb6b4e12da86e98feccb11 (4.14-rc5+).

au0828: recv_control_msg() Failed receiving control message, error -71.
au0828: recv_control_msg() Failed receiving control message, error -71.
au0828: recv_control_msg() Failed receiving control message, error -71.
au8522_writereg: writereg error (reg == 0x106, val == 0x0001, ret == -5)
usb 1-1: selecting invalid altsetting 5
au0828: Failure setting usb interface0 to as5
au0828: au0828_usb_probe() au0282_dev_register failed to register on V4L2
==================================================================
BUG: KASAN: use-after-free in au0828_rc_unregister+0xaa/0xc0
Read of size 8 at addr ffff8800626e2b90 by task kworker/1:1/1491

CPU: 1 PID: 1491 Comm: kworker/1:1 Not tainted
4.14.0-rc5-43687-g06ab8a23e0e6 #545
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
Workqueue: usb_hub_wq hub_event
Call Trace:
__dump_stack lib/dump_stack.c:16
dump_stack+0x292/0x395 lib/dump_stack.c:52
print_address_description+0x78/0x280 mm/kasan/report.c:252
kasan_report_error mm/kasan/report.c:351
kasan_report+0x23d/0x350 mm/kasan/report.c:409
__asan_report_load8_noabort+0x19/0x20 mm/kasan/report.c:430
au0828_rc_unregister+0xaa/0xc0 drivers/media/usb/au0828/au0828-input.c:367
au0828_usb_disconnect+0x63/0x130 drivers/media/usb/au0828/au0828-core.c:189
au0828_usb_probe+0xb3e/0xf20 drivers/media/usb/au0828/au0828-core.c:660
usb_probe_interface+0x35d/0x8e0 drivers/usb/core/driver.c:361
really_probe drivers/base/dd.c:413
driver_probe_device+0x610/0xa00 drivers/base/dd.c:557
__device_attach_driver+0x230/0x290 drivers/base/dd.c:653
bus_for_each_drv+0x161/0x210 drivers/base/bus.c:463
__device_attach+0x26b/0x3c0 drivers/base/dd.c:710
device_initial_probe+0x1f/0x30 drivers/base/dd.c:757
bus_probe_device+0x1eb/0x290 drivers/base/bus.c:523
device_add+0xd0b/0x1660 drivers/base/core.c:1835
usb_set_configuration+0x104e/0x1870 drivers/usb/core/message.c:1932
generic_probe+0x73/0xe0 drivers/usb/core/generic.c:174
usb_probe_device+0xaf/0xe0 drivers/usb/core/driver.c:266
really_probe drivers/base/dd.c:413
driver_probe_device+0x610/0xa00 drivers/base/dd.c:557
__device_attach_driver+0x230/0x290 drivers/base/dd.c:653
bus_for_each_drv+0x161/0x210 drivers/base/bus.c:463
__device_attach+0x26b/0x3c0 drivers/base/dd.c:710
device_initial_probe+0x1f/0x30 drivers/base/dd.c:757
bus_probe_device+0x1eb/0x290 drivers/base/bus.c:523
device_add+0xd0b/0x1660 drivers/base/core.c:1835
usb_new_device+0x7b8/0x1020 drivers/usb/core/hub.c:2457
hub_port_connect drivers/usb/core/hub.c:4903
hub_port_connect_change drivers/usb/core/hub.c:5009
port_event drivers/usb/core/hub.c:5115
hub_event+0x194d/0x3740 drivers/usb/core/hub.c:5195
process_one_work+0xc73/0x1d90 kernel/workqueue.c:2119
worker_thread+0x221/0x1850 kernel/workqueue.c:2253
kthread+0x363/0x440 kernel/kthread.c:231
ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431

The buggy address belongs to the page:
page:ffffea000189b880 count:0 mapcount:0 mapping: (null) index:0x0
flags: 0x100000000000000()
raw: 0100000000000000 0000000000000000 0000000000000000 00000000ffffffff
raw: 0000000000000000 dead000000000200 ffff88006c00d980 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
ffff8800626e2a80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff8800626e2b00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8800626e2b80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
^
ffff8800626e2c00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff8800626e2c80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================

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