==================================================================
BUG: KASAN: use-after-free in mcp2221_raw_event+0x103c/0x10a0 drivers/hid/hid-mcp2221.c:948
Read of size 1 at addr ffff88811c627fff by task kworker/0:5/9531

CPU: 0 UID: 0 PID: 9531 Comm: kworker/0:5 Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: usb_hub_wq hub_event
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0x156/0x4c9 mm/kasan/report.c:482
 kasan_report+0xdf/0x1a0 mm/kasan/report.c:595
 mcp2221_raw_event+0x103c/0x10a0 drivers/hid/hid-mcp2221.c:948
 __hid_input_report.constprop.0+0x314/0x460 drivers/hid/hid-core.c:2139
 hid_irq_in+0x52e/0x6b0 drivers/hid/usbhid/hid-core.c:286
 __usb_hcd_giveback_urb+0x38d/0x610 drivers/usb/core/hcd.c:1657
 usb_hcd_giveback_urb+0x3ca/0x4a0 drivers/usb/core/hcd.c:1741
 dummy_timer+0xd85/0x3670 drivers/usb/gadget/udc/dummy_hcd.c:1995
 __run_hrtimer kernel/time/hrtimer.c:1777 [inline]
 __hrtimer_run_queues+0x516/0x990 kernel/time/hrtimer.c:1841
 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1858
 handle_softirqs+0x1dd/0x8f0 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xed/0x150 kernel/softirq.c:723
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0x8f/0xb0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline]
RIP: 0010:rcu_is_watching+0x41/0xc0 kernel/rcu/tree.c:751
Code: cc 8c 89 c5 83 f8 07 0f 87 82 00 00 00 48 8d 3c ed e0 cb f6 88 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 <75> 5c 48 03 1c ed e0 cb f6 88 48 b8 00 00 00 00 00 fc ff df 48 89
RSP: 0018:ffffc900167f6578 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: ffffffff8ccc9628 RCX: 0000000000000002
RDX: 1ffffffff11ed97c RSI: ffffffff878e9720 RDI: ffffffff88f6cbe0
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000200 R11: 0000000000044cf9 R12: 0000000000000002
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 trace_lock_acquire include/trace/events/lock.h:24 [inline]
 lock_acquire+0x2c4/0x330 kernel/locking/lockdep.c:5831
 rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 rcu_read_lock include/linux/rcupdate.h:867 [inline]
 class_rcu_constructor include/linux/rcupdate.h:1195 [inline]
 unwind_next_frame+0xd1/0x1ea0 arch/x86/kernel/unwind_orc.c:495
 arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
 save_stack+0x162/0x1e0 mm/page_owner.c:165
 __reset_page_owner+0x84/0x190 mm/page_owner.c:320
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1433 [inline]
 __free_frozen_pages+0x7d1/0x1010 mm/page_alloc.c:2973
 selinux_genfs_get_sid security/selinux/hooks.c:1359 [inline]
 inode_doinit_with_dentry+0x9a6/0x1330 security/selinux/hooks.c:1557
 selinux_d_instantiate+0x26/0x40 security/selinux/hooks.c:6545
 security_d_instantiate+0x62/0xc0 security/security.c:3601
 d_make_persistent+0x6a/0x190 fs/dcache.c:2790
 debugfs_create_dir+0x19b/0x440 fs/debugfs/inode.c:591
 i2c_register_adapter+0x3ff/0x1240 drivers/i2c/i2c-core-base.c:1580
 i2c_add_adapter drivers/i2c/i2c-core-base.c:1673 [inline]
 i2c_add_adapter+0x10a/0x1a0 drivers/i2c/i2c-core-base.c:1653
 devm_i2c_add_adapter+0x1b/0x90 drivers/i2c/i2c-core-base.c:1845
 mcp2221_probe.cold+0x5de/0xab3 drivers/hid/hid-mcp2221.c:1289
 __hid_device_probe drivers/hid/hid-core.c:2775 [inline]
 hid_device_probe+0x50e/0x800 drivers/hid/hid-core.c:2812
 call_driver_probe drivers/base/dd.c:581 [inline]
 really_probe+0x241/0xa60 drivers/base/dd.c:659
 __driver_probe_device+0x1de/0x400 drivers/base/dd.c:801
 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:831
 __device_attach_driver+0x1df/0x340 drivers/base/dd.c:959
 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500
 __device_attach+0x1e4/0x4d0 drivers/base/dd.c:1031
 device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1086
 bus_probe_device+0x64/0x160 drivers/base/bus.c:574
 device_add+0x11d9/0x1950 drivers/base/core.c:3689
 hid_add_device+0x2bf/0x440 drivers/hid/hid-core.c:2951
 usbhid_probe+0xd57/0x1350 drivers/hid/usbhid/hid-core.c:1450
 usb_probe_interface+0x303/0x8f0 drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:581 [inline]
 really_probe+0x241/0xa60 drivers/base/dd.c:659
 __driver_probe_device+0x1de/0x400 drivers/base/dd.c:801
 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:831
 __device_attach_driver+0x1df/0x340 drivers/base/dd.c:959
 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500
 __device_attach+0x1e4/0x4d0 drivers/base/dd.c:1031
 device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1086
 bus_probe_device+0x64/0x160 drivers/base/bus.c:574
 device_add+0x11d9/0x1950 drivers/base/core.c:3689
 usb_set_configuration+0xd97/0x1c60 drivers/usb/core/message.c:2210
 usb_generic_driver_probe+0xa1/0xe0 drivers/usb/core/generic.c:250
 usb_probe_device+0xef/0x400 drivers/usb/core/driver.c:291
 call_driver_probe drivers/base/dd.c:581 [inline]
 really_probe+0x241/0xa60 drivers/base/dd.c:659
 __driver_probe_device+0x1de/0x400 drivers/base/dd.c:801
 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:831
 __device_attach_driver+0x1df/0x340 drivers/base/dd.c:959
 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500
 __device_attach+0x1e4/0x4d0 drivers/base/dd.c:1031
 device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1086
 bus_probe_device+0x64/0x160 drivers/base/bus.c:574
 device_add+0x11d9/0x1950 drivers/base/core.c:3689
 usb_new_device.cold+0x685/0x115c drivers/usb/core/hub.c:2695
 hub_port_connect drivers/usb/core/hub.c:5567 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
 port_event drivers/usb/core/hub.c:5871 [inline]
 hub_event+0x314d/0x4af0 drivers/usb/core/hub.c:5953
 process_one_work+0x9c2/0x1840 kernel/workqueue.c:3257
 process_scheduled_works kernel/workqueue.c:3340 [inline]
 worker_thread+0x5da/0xe40 kernel/workqueue.c:3421
 kthread+0x3b3/0x730 kernel/kthread.c:463
 ret_from_fork+0x6c3/0xa20 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888100000000 pfn:0x11c627
flags: 0x200000000000000(node=0|zone=2)
raw: 0200000000000000 dead000000000100 dead000000000122 0000000000000000
raw: ffff888100000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x2cc2(GFP_KERNEL|__GFP_HIGHMEM|__GFP_NOWARN), pid 9531, tgid 9531 (kworker/0:5), ts 1263668051762, free_ts 1264269841080
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1e1/0x250 mm/page_alloc.c:1884
 prep_new_page mm/page_alloc.c:1892 [inline]
 get_page_from_freelist+0xd57/0x3b20 mm/page_alloc.c:3945
 __alloc_frozen_pages_noprof+0x269/0x2230 mm/page_alloc.c:5240
 __alloc_pages_noprof mm/page_alloc.c:5274 [inline]
 alloc_pages_bulk_noprof+0x73f/0x12c0 mm/page_alloc.c:5194
 alloc_pages_bulk_mempolicy_noprof+0x250/0x1270 mm/mempolicy.c:2794
 vm_area_alloc_pages mm/vmalloc.c:3693 [inline]
 __vmalloc_area_node mm/vmalloc.c:3863 [inline]
 __vmalloc_node_range_noprof+0x54b/0x1530 mm/vmalloc.c:4051
 __vmalloc_node_noprof+0xad/0xf0 mm/vmalloc.c:4111
 __vmalloc_noprof+0xa3/0x120 mm/vmalloc.c:4127
 __vmalloc_array_noprof mm/util.c:633 [inline]
 vmalloc_array_noprof+0x43/0x70 mm/util.c:644
 dvb_dmxdev_init+0xbd/0x4c0 drivers/media/dvb-core/dmxdev.c:1417
 dvb_usb_adapter_dvb_init+0x658/0x860 drivers/media/usb/dvb-usb/dvb-usb-dvb.c:192
 dvb_usb_adapter_init drivers/media/usb/dvb-usb/dvb-usb-init.c:86 [inline]
 dvb_usb_init drivers/media/usb/dvb-usb/dvb-usb-init.c:186 [inline]
 dvb_usb_device_init.cold+0xbdb/0x14c3 drivers/media/usb/dvb-usb/dvb-usb-init.c:310
 gp8psk_usb_probe+0x4d/0x80 drivers/media/usb/dvb-usb/gp8psk.c:304
 usb_probe_interface+0x303/0x8f0 drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:581 [inline]
 really_probe+0x241/0xa60 drivers/base/dd.c:659
 __driver_probe_device+0x1de/0x400 drivers/base/dd.c:801
page last free pid 9531 tgid 9531 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1433 [inline]
 __free_frozen_pages+0x7d1/0x1010 mm/page_alloc.c:2973
 vfree.part.0+0x12b/0x9d0 mm/vmalloc.c:3466
 vfree+0x55/0x80 mm/vmalloc.c:3443
 dvb_dmxdev_release+0x20e/0x790 drivers/media/dvb-core/dmxdev.c:1473
 dvb_usb_adapter_dvb_exit+0x9d/0x240 drivers/media/usb/dvb-usb/dvb-usb-dvb.c:224
 dvb_usb_adapter_exit drivers/media/usb/dvb-usb/dvb-usb-init.c:128 [inline]
 dvb_usb_exit drivers/media/usb/dvb-usb/dvb-usb-init.c:143 [inline]
 dvb_usb_device_exit+0x24d/0x520 drivers/media/usb/dvb-usb/dvb-usb-init.c:338
 usb_unbind_interface+0x1dd/0x9e0 drivers/usb/core/driver.c:458
 device_remove drivers/base/dd.c:571 [inline]
 device_remove+0x12a/0x180 drivers/base/dd.c:563
 __device_release_driver drivers/base/dd.c:1282 [inline]
 device_release_driver_internal+0x42e/0x600 drivers/base/dd.c:1305
 bus_remove_device+0x22f/0x440 drivers/base/bus.c:616
 device_del+0x376/0x9b0 drivers/base/core.c:3878
 usb_disable_device+0x367/0x810 drivers/usb/core/message.c:1418
 usb_disconnect+0x2e2/0x9a0 drivers/usb/core/hub.c:2345
 hub_port_connect drivers/usb/core/hub.c:5407 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
 port_event drivers/usb/core/hub.c:5871 [inline]
 hub_event+0x1d0c/0x4af0 drivers/usb/core/hub.c:5953
 process_one_work+0x9c2/0x1840 kernel/workqueue.c:3257
 process_scheduled_works kernel/workqueue.c:3340 [inline]
 worker_thread+0x5da/0xe40 kernel/workqueue.c:3421

Memory state around the buggy address:
 ffff88811c627e80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88811c627f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88811c627f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                                ^
 ffff88811c628000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88811c628080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess):
   0:	cc                   	int3
   1:	8c 89 c5 83 f8 07    	mov    %cs,0x7f883c5(%rcx)
   7:	0f 87 82 00 00 00    	ja     0x8f
   d:	48 8d 3c ed e0 cb f6 	lea    -0x77093420(,%rbp,8),%rdi
  14:	88
  15:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  1c:	fc ff df
  1f:	48 89 fa             	mov    %rdi,%rdx
  22:	48 c1 ea 03          	shr    $0x3,%rdx
  26:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
* 2a:	75 5c                	jne    0x88 <-- trapping instruction
  2c:	48 03 1c ed e0 cb f6 	add    -0x77093420(,%rbp,8),%rbx
  33:	88
  34:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  3b:	fc ff df
  3e:	48                   	rex.W
  3f:	89                   	.byte 0x89