configfs-gadget.g1 gadget.32: uvc: uvc_function_bind()
Oops: general protection fault, probably for non-canonical address 0xdffffc00000000ec: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000760-0x0000000000000767]
CPU: 2 UID: 0 PID: 5917 Comm: syz.2.9 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:uvcg_video_init.cold+0x5f/0x135 drivers/usb/gadget/function/uvc_video.c:824
Code: e0 2a 80 3c 02 00 74 08 48 89 df e8 ea 2c 24 01 48 8b 2b b8 ff ff 37 00 48 c1 e0 2a 48 8d bd 60 07 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 b1 00 00 00 48 8d bd 90 07 00 00 b8 ff ff 37 00
RSP: 0018:ffffc90006467860 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff888025172840 RCX: ffffc9000d231000
RDX: 00000000000000ec RSI: ffffffff81550dd6 RDI: 0000000000000760
RBP: 0000000000000000 R08: 0000000000000007 R09: fffffffffffff000
R10: fffffffffffffffc R11: 0000000000000000 R12: ffff8880251728a0
R13: 0000000000000001 R14: ffff8880251726a0 R15: ffff888013c2a528
FS:  0000000000000000(0000) GS:ffff888096de3000(0063) knlGS:00000000f5426b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00007f1bb8957af0 CR3: 000000006cfb5000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 uvc_function_bind+0x136e/0x1939 drivers/usb/gadget/function/f_uvc.c:874
 usb_add_function+0x219/0x890 drivers/usb/gadget/composite.c:333
 configfs_composite_bind+0xd83/0x1960 drivers/usb/gadget/configfs.c:1802
 gadget_bind_driver+0x28c/0xbf0 drivers/usb/gadget/udc/core.c:1662
 call_driver_probe drivers/base/dd.c:628 [inline]
 really_probe+0x241/0xa60 drivers/base/dd.c:706
 __driver_probe_device+0x20e/0x450 drivers/base/dd.c:868
 driver_probe_device+0x4a/0x140 drivers/base/dd.c:898
 __driver_attach+0x21f/0x5b0 drivers/base/dd.c:1292
 bus_for_each_dev+0x13e/0x1d0 drivers/base/bus.c:383
 bus_add_driver+0x305/0x5b0 drivers/base/bus.c:763
 driver_register+0x1e2/0x360 drivers/base/driver.c:174
 usb_gadget_register_driver_owner+0x132/0x210 drivers/usb/gadget/udc/core.c:1752
 gadget_dev_desc_UDC_store+0x1b0/0x2e0 drivers/usb/gadget/configfs.c:300
 flush_write_buffer fs/configfs/file.c:207 [inline]
 configfs_write_iter+0x302/0x4e0 fs/configfs/file.c:229
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6ac/0x1050 fs/read_write.c:687
 ksys_write+0x12a/0x250 fs/read_write.c:739
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0xe7/0x970 arch/x86/entry/syscall_32.c:307
 do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:332
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7f66fec
Code: Unable to access opcode bytes at 0xf7f66fc2.
RSP: 002b:00000000f542650c EFLAGS: 00000292 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000080002100
RDX: 000000000000000c RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:uvcg_video_init.cold+0x5f/0x135 drivers/usb/gadget/function/uvc_video.c:824
Code: e0 2a 80 3c 02 00 74 08 48 89 df e8 ea 2c 24 01 48 8b 2b b8 ff ff 37 00 48 c1 e0 2a 48 8d bd 60 07 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 b1 00 00 00 48 8d bd 90 07 00 00 b8 ff ff 37 00
RSP: 0018:ffffc90006467860 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff888025172840 RCX: ffffc9000d231000
RDX: 00000000000000ec RSI: ffffffff81550dd6 RDI: 0000000000000760
RBP: 0000000000000000 R08: 0000000000000007 R09: fffffffffffff000
R10: fffffffffffffffc R11: 0000000000000000 R12: ffff8880251728a0
R13: 0000000000000001 R14: ffff8880251726a0 R15: ffff888013c2a528
FS:  0000000000000000(0000) GS:ffff888096be3000(0063) knlGS:00000000f5426b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f7f855c0 CR3: 000000006cfb5000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
   0:	e0 2a                	loopne 0x2c
   2:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   6:	74 08                	je     0x10
   8:	48 89 df             	mov    %rbx,%rdi
   b:	e8 ea 2c 24 01       	call   0x1242cfa
  10:	48 8b 2b             	mov    (%rbx),%rbp
  13:	b8 ff ff 37 00       	mov    $0x37ffff,%eax
  18:	48 c1 e0 2a          	shl    $0x2a,%rax
  1c:	48 8d bd 60 07 00 00 	lea    0x760(%rbp),%rdi
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 b1 00 00 00    	jne    0xe5
  34:	48 8d bd 90 07 00 00 	lea    0x790(%rbp),%rdi
  3b:	b8 ff ff 37 00       	mov    $0x37ffff,%eax