Hello, When fuzzing the Linux kernel driver v5.18.0, the following crash was triggered. HEAD commit: 4b0986a3613c92f4ec1bdc7f60ec66fea135991f (HEAD, tag: v5.18) git tree: upstream kernel config: https://pastebin.com/KecL2gaG C reproducer: https://pastebin.com/F9uLd7Ax console output: https://pastebin.com/c7CR3ZN1 Basically, in the c reproducer, we use the gadget module to emulate the process of attaching a usb device (vendor id: 0x15c2, product id:0x36, with function: midi). To reproduce this crash, we utilize a third-party library to emulate the attaching process: https://github.com/linux-usb-gadgets/libusbgx. Just clone this repository, make install it, and compile the c reproducer with ``` gcc crash.c -lusbgx -o crash ``` will do the trick. It seems that when usb_probe_interface calls the imon probe modules, the imon_init_intf1 function did something wrong, causeing the kernel to produce such an error message. The crash report is as follow: ``` imon:imon_probe: failed to initialize context! imon 2-1:1.0: unable to register, err -19 ------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(lock->magic != lock) WARNING: CPU: 2 PID: 2324 at kernel/locking/mutex.c:582 __mutex_lock_common kernel/locking/mutex.c:582 [inline] WARNING: CPU: 2 PID: 2324 at kernel/locking/mutex.c:582 __mutex_lock+0xf56/0x1f50 kernel/locking/mutex.c:747 Modules linked in: CPU: 2 PID: 2324 Comm: kworker/2:2 Not tainted 5.19.0-rc4-00208-g69cb6c6556ad #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 Workqueue: usb_hub_wq hub_event RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:582 [inline] RIP: 0010:__mutex_lock+0xf56/0x1f50 kernel/locking/mutex.c:747 Code: 08 84 d2 0f 85 c7 0f 00 00 8b 15 5d 50 4e 03 85 d2 0f 85 d9 f1 ff ff 48 c7 c6 00 83 47 86 48 c7 c7 40 81 47 86 e8 38 12 d1 ff <0f> 0b e9 bf f1 ff ff 0f 0b e9 6b f4 ff ff 48 8b 85 d0 fe ff ff 48 RSP: 0018:ffffc90002e2ef60 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffffc9000dec9000 RSI: ffff8881108fb900 RDI: fffff520005c5dde RBP: ffffc90002e2f0c0 R08: ffffffff812c3638 R09: 0000000000000000 R10: 0000000000000005 R11: ffffed1023524ef1 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff88811011ede0 R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff88811a900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000001000003ff CR3: 000000010f696000 CR4: 0000000000350ee0 Call Trace: <TASK> imon_init_intf1 drivers/media/rc/imon.c:2323 [inline] imon_probe+0x1e0/0x2bf0 drivers/media/rc/imon.c:2451 usb_probe_interface+0x310/0x800 drivers/usb/core/driver.c:396``` really_probe+0x23e/0xa80 drivers/base/dd.c:579 __driver_probe_device+0x338/0x4d0 drivers/base/dd.c:764 driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:794 __device_attach_driver+0x20b/0x2f0 drivers/base/dd.c:917 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:427 __device_attach+0x283/0x490 drivers/base/dd.c:989 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:487 device_add+0xc9b/0x1da0 drivers/base/core.c:3417 usb_set_configuration+0x1019/0x1900 drivers/usb/core/message.c:2170 usb_generic_driver_probe+0x9d/0xe0 drivers/usb/core/generic.c:238 usb_probe_device+0xd9/0x2a0 drivers/usb/core/driver.c:293 call_driver_probe drivers/base/dd.c:555 [inline] really_probe drivers/base/dd.c:634 [inline] really_probe+0x23e/0xa80 drivers/base/dd.c:579 __driver_probe_device+0x338/0x4d0 drivers/base/dd.c:764 driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:794 __device_attach_driver+0x20b/0x2f0 drivers/base/dd.c:917 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:427 __device_attach+0x283/0x490 drivers/base/dd.c:989 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:487 device_add+0xc9b/0x1da0 drivers/base/core.c:3417 usb_new_device.cold+0x4b8/0x10ca drivers/usb/core/hub.c:2566 hub_port_connect drivers/usb/core/hub.c:5363 [inline] hub_port_connect_change drivers/usb/core/hub.c:5507 [inline] port_event drivers/usb/core/hub.c:5663 [inline] hub_event+0x232d/0x4180 drivers/usb/core/hub.c:5745 process_one_work+0x9cc/0x1650 kernel/workqueue.c:2289 worker_thread+0x623/0x1070 kernel/workqueue.c:2436 kthread+0x2ef/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 </TASK> ```
