================================================================== BUG: KFENCE: use-after-free read in __lock_acquire+0x111/0x7c80 kernel/locking/lockdep.c:-1 Use-after-free read at 0xffff88823bdba098 (in kfence-#220): __lock_acquire+0x111/0x7c80 kernel/locking/lockdep.c:-1 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xa8/0xf0 kernel/locking/spinlock.c:162 get_entry drivers/media/common/siano/smscoreapi.c:1633 [inline] smscore_getbuffer+0xa9/0x440 drivers/media/common/siano/smscoreapi.c:1646 smsusb_submit_urb drivers/media/usb/siano/smsusb.c:155 [inline] do_submit_urb+0x98/0x360 drivers/media/usb/siano/smsusb.c:75 process_one_work kernel/workqueue.c:2634 [inline] process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 kfence-#220: 0xffff88823bdba000-0xffff88823bdba64f, size=1616, cache=kmalloc-2k allocated by task 2262 on cpu 1 at 1490.172954s: kfence_alloc include/linux/kfence.h:129 [inline] slab_alloc_node mm/slub.c:3481 [inline] __kmem_cache_alloc_node+0x1ff/0x260 mm/slub.c:3534 kmalloc_trace+0x2a/0xe0 mm/slab_common.c:1098 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:721 [inline] smscore_register_device+0x63/0x10f0 drivers/media/common/siano/smscoreapi.c:650 smsusb_init_device drivers/media/usb/siano/smsusb.c:455 [inline] smsusb_probe+0x1362/0x1da0 drivers/media/usb/siano/smsusb.c:569 usb_probe_interface+0x5a4/0xb00 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x25b/0xb40 drivers/base/dd.c:658 __driver_probe_device+0x18c/0x330 drivers/base/dd.c:800 driver_probe_device+0x4f/0x420 drivers/base/dd.c:830 __device_attach_driver+0x2ca/0x520 drivers/base/dd.c:958 bus_for_each_drv+0x24b/0x2d0 drivers/base/bus.c:459 __device_attach+0x2b5/0x400 drivers/base/dd.c:1030 bus_probe_device+0x180/0x260 drivers/base/bus.c:534 device_add+0x85b/0xc20 drivers/base/core.c:3683 usb_set_configuration+0x1a79/0x20c0 drivers/usb/core/message.c:2207 usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:238 usb_probe_device+0x13d/0x280 drivers/usb/core/driver.c:293 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x25b/0xb40 drivers/base/dd.c:658 __driver_probe_device+0x18c/0x330 drivers/base/dd.c:800 driver_probe_device+0x4f/0x420 drivers/base/dd.c:830 __device_attach_driver+0x2ca/0x520 drivers/base/dd.c:958 bus_for_each_drv+0x24b/0x2d0 drivers/base/bus.c:459 __device_attach+0x2b5/0x400 drivers/base/dd.c:1030 bus_probe_device+0x180/0x260 drivers/base/bus.c:534 device_add+0x85b/0xc20 drivers/base/core.c:3683 usb_new_device+0xa31/0x1630 drivers/usb/core/hub.c:2660 hub_port_connect drivers/usb/core/hub.c:5529 [inline] hub_port_connect_change drivers/usb/core/hub.c:5669 [inline] port_event drivers/usb/core/hub.c:5833 [inline] hub_event+0x2962/0x49c0 drivers/usb/core/hub.c:5915 process_one_work kernel/workqueue.c:2634 [inline] process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 freed by task 2262 on cpu 1 at 1490.948053s: smscore_unregister_device+0x603/0x6e0 drivers/media/common/siano/smscoreapi.c:1242 smsusb_term_device+0x18f/0x220 drivers/media/usb/siano/smsusb.c:349 smsusb_init_device drivers/media/usb/siano/smsusb.c:491 [inline] smsusb_probe+0x1708/0x1da0 drivers/media/usb/siano/smsusb.c:569 usb_probe_interface+0x5a4/0xb00 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x25b/0xb40 drivers/base/dd.c:658 __driver_probe_device+0x18c/0x330 drivers/base/dd.c:800 driver_probe_device+0x4f/0x420 drivers/base/dd.c:830 __device_attach_driver+0x2ca/0x520 drivers/base/dd.c:958 bus_for_each_drv+0x24b/0x2d0 drivers/base/bus.c:459 __device_attach+0x2b5/0x400 drivers/base/dd.c:1030 bus_probe_device+0x180/0x260 drivers/base/bus.c:534 device_add+0x85b/0xc20 drivers/base/core.c:3683 usb_set_configuration+0x1a79/0x20c0 drivers/usb/core/message.c:2207 usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:238 usb_probe_device+0x13d/0x280 drivers/usb/core/driver.c:293 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x25b/0xb40 drivers/base/dd.c:658 __driver_probe_device+0x18c/0x330 drivers/base/dd.c:800 driver_probe_device+0x4f/0x420 drivers/base/dd.c:830 __device_attach_driver+0x2ca/0x520 drivers/base/dd.c:958 bus_for_each_drv+0x24b/0x2d0 drivers/base/bus.c:459 __device_attach+0x2b5/0x400 drivers/base/dd.c:1030 bus_probe_device+0x180/0x260 drivers/base/bus.c:534 device_add+0x85b/0xc20 drivers/base/core.c:3683 usb_new_device+0xa31/0x1630 drivers/usb/core/hub.c:2660 hub_port_connect drivers/usb/core/hub.c:5529 [inline] hub_port_connect_change drivers/usb/core/hub.c:5669 [inline] port_event drivers/usb/core/hub.c:5833 [inline] hub_event+0x2962/0x49c0 drivers/usb/core/hub.c:5915 process_one_work kernel/workqueue.c:2634 [inline] process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 CPU: 1 PID: 5781 Comm: kworker/1:3 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Workqueue: events do_submit_urb RIP: 0010:__lock_acquire+0x111/0x7c80 kernel/locking/lockdep.c:5005 Code: 48 c1 e8 03 42 80 3c 00 00 74 1f 48 8b bc 24 88 00 00 00 e8 91 ea 75 00 48 8b bc 24 88 00 00 00 49 b8 00 00 00 00 00 fc ff df <48> 81 3f c0 83 91 90 75 03 45 31 e4 44 89 6c 24 38 44 89 a4 24 b8 RSP: 0018:ffffc900042f7600 EFLAGS: 00010046 RAX: 1ffff110477b7413 RBX: 1ffff9200085eee4 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88823bdba098 RBP: ffffc900042f7848 R08: dffffc0000000000 R09: 0000000000000001 R10: dffffc0000000000 R11: fffffbfff1c9516e R12: 0000000000000001 R13: 0000000000000001 R14: ffff88802da55a00 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff88823bdba098 CR3: 000000001ca51000 CR4: 00000000003506e0 Call Trace: lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xa8/0xf0 kernel/locking/spinlock.c:162 get_entry drivers/media/common/siano/smscoreapi.c:1633 [inline] smscore_getbuffer+0xa9/0x440 drivers/media/common/siano/smscoreapi.c:1646 smsusb_submit_urb drivers/media/usb/siano/smsusb.c:155 [inline] do_submit_urb+0x98/0x360 drivers/media/usb/siano/smsusb.c:75 process_one_work kernel/workqueue.c:2634 [inline] process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 ================================================================== ---------------- Code disassembly (best guess): 0: 48 c1 e8 03 shr $0x3,%rax 4: 42 80 3c 00 00 cmpb $0x0,(%rax,%r8,1) 9: 74 1f je 0x2a b: 48 8b bc 24 88 00 00 mov 0x88(%rsp),%rdi 12: 00 13: e8 91 ea 75 00 call 0x75eaa9 18: 48 8b bc 24 88 00 00 mov 0x88(%rsp),%rdi 1f: 00 20: 49 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%r8 27: fc ff df * 2a: 48 81 3f c0 83 91 90 cmpq $0xffffffff909183c0,(%rdi) <-- trapping instruction 31: 75 03 jne 0x36 33: 45 31 e4 xor %r12d,%r12d 36: 44 89 6c 24 38 mov %r13d,0x38(%rsp) 3b: 44 rex.R 3c: 89 .byte 0x89 3d: a4 movsb %ds:(%rsi),%es:(%rdi) 3e: 24 b8 and $0xb8,%al