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Subjectkernel BUG at drivers/media/mc/mc-entity.c:LINE!
From
Hello,

syzbot found the following crash on:

HEAD commit: 32b5e2b2 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=101d682ae00000
kernel config: https://syzkaller.appspot.com/x/.config?x=d88612251f7691bd
dashboard link: https://syzkaller.appspot.com/bug?extid=8eb28ed1d916cc03eef6
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15b9ffcee00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16859696e00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+8eb28ed1d916cc03eef6@syzkaller.appspotmail.com

usb 1-1: New USB device found, idVendor=18cd, idProduct=cafe, bcdDevice=
3.bb
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=16
usb 1-1: SerialNumber: syz
usb 1-1: config 0 descriptor??
uvcvideo: Found UVC 0.00 device <unnamed> (18cd:cafe)
uvcvideo 1-1:0.0: Entity type for entity Output 0 was not initialized!
------------[ cut here ]------------
kernel BUG at drivers/media/mc/mc-entity.c:666!
invalid opcode: 0000 [#1] SMP KASAN
CPU: 1 PID: 22 Comm: kworker/1:1 Not tainted 5.4.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: usb_hub_wq hub_event
RIP: 0010:media_create_pad_link+0x40f/0x530 drivers/media/mc/mc-entity.c:666
Code: 83 45 3a 01 45 31 e4 e8 9f 93 59 fd 44 89 e0 48 83 c4 18 5b 5d 41 5c
41 5d 41 5e 41 5f c3 e8 88 93 59 fd 0f 0b e8 81 93 59 fd <0f> 0b e8 7a 93
59 fd 0f 0b e8 53 23 81 fd e9 91 fc ff ff e8 49 23
RSP: 0018:ffff8881d8c2f058 EFLAGS: 00010293
RAX: ffff8881da24e200 RBX: ffff8881cf8dc070 RCX: ffffffff83e4dd4b
RDX: 0000000000000000 RSI: ffffffff83e4e0df RDI: 0000000000000000
RBP: ffff8881cf8da070 R08: ffff8881da24e200 R09: ffffed1039ff2a91
R10: ffffed1039ff2a90 R11: ffff8881cff95483 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000003 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7061237000 CR3: 00000001d148c000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
uvc_mc_create_links drivers/media/usb/uvc/uvc_entity.c:50 [inline]
uvc_mc_register_entities+0x468/0x77a drivers/media/usb/uvc/uvc_entity.c:114
uvc_register_chains drivers/media/usb/uvc/uvc_driver.c:2075 [inline]
uvc_probe.cold+0x2137/0x29de drivers/media/usb/uvc/uvc_driver.c:2201
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+0x1480/0x1c20 drivers/base/core.c:2487
usb_set_configuration+0xe67/0x1740 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+0x1480/0x1c20 drivers/base/core.c:2487
usb_new_device.cold+0x6a4/0xe79 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+0x1e59/0x3860 drivers/usb/core/hub.c:5552
process_one_work+0x92b/0x1530 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 4651c1a0587de7fd ]---
RIP: 0010:media_create_pad_link+0x40f/0x530 drivers/media/mc/mc-entity.c:666
Code: 83 45 3a 01 45 31 e4 e8 9f 93 59 fd 44 89 e0 48 83 c4 18 5b 5d 41 5c
41 5d 41 5e 41 5f c3 e8 88 93 59 fd 0f 0b e8 81 93 59 fd <0f> 0b e8 7a 93
59 fd 0f 0b e8 53 23 81 fd e9 91 fc ff ff e8 49 23
RSP: 0018:ffff8881d8c2f058 EFLAGS: 00010293
RAX: ffff8881da24e200 RBX: ffff8881cf8dc070 RCX: ffffffff83e4dd4b
RDX: 0000000000000000 RSI: ffffffff83e4e0df RDI: 0000000000000000
RBP: ffff8881cf8da070 R08: ffff8881da24e200 R09: ffffed1039ff2a91
R10: ffffed1039ff2a90 R11: ffff8881cff95483 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000003 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7061237000 CR3: 00000001d148c000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
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:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches

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