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SubjectWARNING in em28xx_init_extension
From
Hello,

syzbot found the following crash on:

HEAD commit: 2994c077 usb-fuzzer: main usb gadget fuzzer driver
git tree: https://github.com/google/kasan.git usb-fuzzer
console output: https://syzkaller.appspot.com/x/log.txt?x=171c4be3600000
kernel config: https://syzkaller.appspot.com/x/.config?x=69ddefac6929256a
dashboard link: https://syzkaller.appspot.com/bug?extid=76929be61691e7b3904b
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=137d73bd600000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14f0c8cb600000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+76929be61691e7b3904b@syzkaller.appspotmail.com

em28xx 1-1:0.221: Audio interface 221 found (Vendor Class)
em28xx 1-1:0.221: unknown em28xx chip ID (0)
em28xx 1-1:0.221: Config register raw data: 0xfffffffb
em28xx 1-1:0.221: AC97 chip type couldn't be determined
em28xx 1-1:0.221: No AC97 audio processor
------------[ cut here ]------------
list_add corruption. prev->next should be next (ffffffff87779de0), but was
ffffffff8352fdcc. (prev=ffff8881d2ecc240).
WARNING: CPU: 1 PID: 83 at lib/list_debug.c:26 __list_add_valid+0x99/0xf0
lib/list_debug.c:26
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 83 Comm: kworker/1:2 Not tainted 5.3.0+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: usb_hub_wq hub_event
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0xca/0x13e lib/dump_stack.c:113
panic+0x2a3/0x6da kernel/panic.c:219
__warn.cold+0x20/0x4a kernel/panic.c:576
report_bug+0x262/0x2a0 lib/bug.c:186
fixup_bug arch/x86/kernel/traps.c:179 [inline]
fixup_bug arch/x86/kernel/traps.c:174 [inline]
do_error_trap+0x12b/0x1e0 arch/x86/kernel/traps.c:272
do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:291
invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1028
RIP: 0010:__list_add_valid+0x99/0xf0 lib/list_debug.c:26
Code: 48 c7 c7 60 06 db 85 e8 2a 7a 30 ff 0f 0b 48 83 c4 08 31 c0 5d 41 5c
c3 48 89 f1 48 c7 c7 20 07 db 85 4c 89 e6 e8 0c 7a 30 ff <0f> 0b 31 c0 eb
c5 48 89 f2 4c 89 e1 48 89 ee 48 c7 c7 a0 07 db 85
RSP: 0018:ffff8881d93cf120 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff8881d2810120 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8128d3fd RDI: ffffed103b279e16
RBP: ffff8881d2810240 R08: ffff8881d92a3000 R09: fffffbfff11f45af
R10: fffffbfff11f45ae R11: ffffffff88fa2d77 R12: ffffffff87779de0
R13: ffff8881d2810000 R14: ffff8881d281012c R15: ffff8881d2c84400
__list_add include/linux/list.h:60 [inline]
list_add_tail include/linux/list.h:93 [inline]
em28xx_init_extension+0x44/0x1f0
drivers/media/usb/em28xx/em28xx-core.c:1125
em28xx_init_dev.isra.0+0xa7b/0x15d8
drivers/media/usb/em28xx/em28xx-cards.c:3520
em28xx_usb_probe.cold+0xcac/0x2516
drivers/media/usb/em28xx/em28xx-cards.c:3869
usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
really_probe+0x281/0x6d0 drivers/base/dd.c:548
driver_probe_device+0x104/0x210 drivers/base/dd.c:721
__device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
__device_attach+0x217/0x360 drivers/base/dd.c:894
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
device_add+0xae6/0x16f0 drivers/base/core.c:2201
usb_set_configuration+0xdf6/0x1670 drivers/usb/core/message.c:2023
generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266
really_probe+0x281/0x6d0 drivers/base/dd.c:548
driver_probe_device+0x104/0x210 drivers/base/dd.c:721
__device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
__device_attach+0x217/0x360 drivers/base/dd.c:894
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
device_add+0xae6/0x16f0 drivers/base/core.c:2201
usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2536
hub_port_connect drivers/usb/core/hub.c:5098 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5213 [inline]
port_event drivers/usb/core/hub.c:5359 [inline]
hub_event+0x1b5c/0x3640 drivers/usb/core/hub.c:5441
process_one_work+0x92b/0x1530 kernel/workqueue.c:2269
process_scheduled_works kernel/workqueue.c:2331 [inline]
worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417
kthread+0x318/0x420 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
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