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SubjectBUG: corrupted list in uvc_scan_chain_forward
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Hello,

syzbot found the following crash on:

HEAD commit: ae179410 usb: gadget: add raw-gadget interface
git tree: https://github.com/google/kasan.git usb-fuzzer
console output: https://syzkaller.appspot.com/x/log.txt?x=168765c6e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=4b345df402514029
dashboard link: https://syzkaller.appspot.com/bug?extid=636c17630dbe1250025a
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12b316aee00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13332d49e00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+636c17630dbe1250025a@syzkaller.appspotmail.com

usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 1-1: Product: syz
usb 1-1: Manufacturer: syz
usb 1-1: SerialNumber: syz
usb 1-1: config 0 descriptor??
uvcvideo: Found UVC 0.00 device syz (18cd:cafe)
list_add double add: new=ffff8881cdea0010, prev=ffff8881cdea0010,
next=ffff8881d718f218.
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:29!
invalid opcode: 0000 [#1] SMP KASAN
CPU: 0 PID: 95 Comm: kworker/0:2 Not tainted 5.5.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: usb_hub_wq hub_event
RIP: 0010:__list_add_valid.cold+0x26/0x3c lib/list_debug.c:29
Code: 57 ff ff ff 4c 89 e1 48 c7 c7 c0 fa fb 85 e8 4b 20 40 ff 0f 0b 48 89
f2 4c 89 e1 48 89 ee 48 c7 c7 00 fc fb 85 e8 34 20 40 ff <0f> 0b 48 89 f1
48 c7 c7 80 fb fb 85 4c 89 e6 e8 20 20 40 ff 0f 0b
RSP: 0018:ffff8881d5d8f080 EFLAGS: 00010286
RAX: 0000000000000058 RBX: ffff8881cdea0010 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff812959ad RDI: ffffed103abb1e02
RBP: ffff8881cdea0010 R08: 0000000000000058 R09: fffffbfff1269aae
R10: fffffbfff1269aad R11: ffffffff8934d56f R12: ffff8881d718f218
R13: ffff8881cdea0000 R14: dffffc0000000000 R15: ffff8881d718f218
FS: 0000000000000000(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f514c22d000 CR3: 00000001c6507000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__list_add include/linux/list.h:60 [inline]
list_add_tail include/linux/list.h:93 [inline]
uvc_scan_chain_forward.isra.0+0x4df/0x637
drivers/media/usb/uvc/uvc_driver.c:1526
uvc_scan_chain drivers/media/usb/uvc/uvc_driver.c:1640 [inline]
uvc_scan_device drivers/media/usb/uvc/uvc_driver.c:1824 [inline]
uvc_probe.cold+0x1aee/0x29de drivers/media/usb/uvc/uvc_driver.c:2197
usb_probe_interface+0x310/0x800 drivers/usb/core/driver.c:361
really_probe+0x290/0xad0 drivers/base/dd.c:548
driver_probe_device+0x223/0x350 drivers/base/dd.c:721
__device_attach_driver+0x1d1/0x290 drivers/base/dd.c:828
bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
__device_attach+0x217/0x390 drivers/base/dd.c:894
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
device_add+0x1459/0x1bf0 drivers/base/core.c:2487
usb_set_configuration+0xe47/0x17d0 drivers/usb/core/message.c:2023
generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
usb_probe_device+0xaf/0x140 drivers/usb/core/driver.c:266
really_probe+0x290/0xad0 drivers/base/dd.c:548
driver_probe_device+0x223/0x350 drivers/base/dd.c:721
__device_attach_driver+0x1d1/0x290 drivers/base/dd.c:828
bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
__device_attach+0x217/0x390 drivers/base/dd.c:894
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
device_add+0x1459/0x1bf0 drivers/base/core.c:2487
usb_new_device.cold+0x540/0xcd0 drivers/usb/core/hub.c:2537
hub_port_connect drivers/usb/core/hub.c:5184 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5324 [inline]
port_event drivers/usb/core/hub.c:5470 [inline]
hub_event+0x21cb/0x4300 drivers/usb/core/hub.c:5552
process_one_work+0x945/0x15c0 kernel/workqueue.c:2264
worker_thread+0x96/0xe20 kernel/workqueue.c:2410
kthread+0x318/0x420 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Modules linked in:
---[ end trace 8c363b461f6a7f0a ]---
RIP: 0010:__list_add_valid.cold+0x26/0x3c lib/list_debug.c:29
Code: 57 ff ff ff 4c 89 e1 48 c7 c7 c0 fa fb 85 e8 4b 20 40 ff 0f 0b 48 89
f2 4c 89 e1 48 89 ee 48 c7 c7 00 fc fb 85 e8 34 20 40 ff <0f> 0b 48 89 f1
48 c7 c7 80 fb fb 85 4c 89 e6 e8 20 20 40 ff 0f 0b
RSP: 0018:ffff8881d5d8f080 EFLAGS: 00010286


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this bug report. See:
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syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches

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