==================================================================
BUG: KASAN: slab-out-of-bounds in mcp2221_raw_event+0x1070/0x10a0 drivers/hid/hid-mcp2221.c:948
Read of size 1 at addr ffff888055063fff by task kworker/1:3/5895

CPU: 1 UID: 0 PID: 5895 Comm: kworker/1:3 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: usb_hub_wq hub_event
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xcd/0x630 mm/kasan/report.c:482
 kasan_report+0xe0/0x110 mm/kasan/report.c:595
 mcp2221_raw_event+0x1070/0x10a0 drivers/hid/hid-mcp2221.c:948
 __hid_input_report.constprop.0+0x314/0x470 drivers/hid/hid-core.c:2139
 hid_irq_in+0x35e/0x870 drivers/hid/usbhid/hid-core.c:286
 __usb_hcd_giveback_urb+0x38b/0x610 drivers/usb/core/hcd.c:1661
 usb_hcd_giveback_urb+0x39b/0x450 drivers/usb/core/hcd.c:1745
 dummy_timer+0x1809/0x3ad0 drivers/usb/gadget/udc/dummy_hcd.c:1995
 __run_hrtimer kernel/time/hrtimer.c:1777 [inline]
 __hrtimer_run_queues+0x202/0xc40 kernel/time/hrtimer.c:1841
 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1858
 handle_softirqs+0x219/0x950 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0x109/0x170 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+0xa4/0xc0 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:stack_trace_consume_entry+0x4/0x170 kernel/stacktrace.c:86
Code: 00 e9 36 ff ff ff 49 c7 c4 ea ff ff ff eb c7 e8 02 50 cd 09 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa <48> b8 00 00 00 00 00 fc ff df 55 53 48 89 fb 48 83 c7 10 48 89 fa
RSP: 0018:ffffc9000448e508 EFLAGS: 00000282
RAX: ffffffff82190d4f RBX: ffffc9000448e510 RCX: ffffc9000448e464
RDX: 1ffff92000891cab RSI: ffffffff82190d4f RDI: ffffc9000448e5d0
RBP: ffffc9000448e5a0 R08: 0000000000000001 R09: 00000000404a7b0b
R10: 0000000000000002 R11: 0000000000013273 R12: ffffffff81a950b0
R13: ffffc9000448e5d0 R14: 0000000000000000 R15: ffff88802da38000
 arch_stack_walk+0x88/0x100 arch/x86/kernel/stacktrace.c:27
 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
 save_stack+0x160/0x1f0 mm/page_owner.c:165
 __reset_page_owner+0x84/0x1a0 mm/page_owner.c:320
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 __free_frozen_pages+0x7df/0x1170 mm/page_alloc.c:2943
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x4c/0xf0 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:349
 kasan_slab_alloc include/linux/kasan.h:252 [inline]
 slab_post_alloc_hook mm/slub.c:4953 [inline]
 slab_alloc_node mm/slub.c:5263 [inline]
 kmem_cache_alloc_lru_noprof+0x262/0x770 mm/slub.c:5282
 __d_alloc+0x35/0xa80 fs/dcache.c:1730
 d_alloc+0x4a/0x1e0 fs/dcache.c:1809
 lookup_one_qstr_excl+0x175/0x250 fs/namei.c:1743
 __start_dirop fs/namei.c:2866 [inline]
 start_dirop+0x59/0xb0 fs/namei.c:2875
 simple_start_creating+0xf4/0x100 fs/libfs.c:2330
 debugfs_start_creating.part.0+0x86/0x1c0 fs/debugfs/inode.c:394
 debugfs_start_creating fs/debugfs/inode.c:371 [inline]
 debugfs_create_dir+0x72/0x470 fs/debugfs/inode.c:572
 i2c_register_adapter+0x3ff/0x13b0 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+0x5f1/0xc50 drivers/hid/hid-mcp2221.c:1289
 __hid_device_probe drivers/hid/hid-core.c:2775 [inline]
 hid_device_probe+0x5ba/0x8d0 drivers/hid/hid-core.c:2812
 call_driver_probe drivers/base/dd.c:581 [inline]
 really_probe+0x241/0xb20 drivers/base/dd.c:659
 __driver_probe_device+0x1de/0x470 drivers/base/dd.c:801
 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:831
 __device_attach_driver+0x1df/0x350 drivers/base/dd.c:959
 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500
 __device_attach+0x1e4/0x4e0 drivers/base/dd.c:1031
 device_initial_probe+0xaa/0xc0 drivers/base/dd.c:1086
 bus_probe_device+0x64/0x150 drivers/base/bus.c:574
 device_add+0x116e/0x1980 drivers/base/core.c:3689
 hid_add_device+0x31b/0x5c0 drivers/hid/hid-core.c:2951
 usbhid_probe+0xd5d/0x1410 drivers/hid/usbhid/hid-core.c:1435
 usb_probe_interface+0x303/0xa80 drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:581 [inline]
 really_probe+0x241/0xb20 drivers/base/dd.c:659
 __driver_probe_device+0x1de/0x470 drivers/base/dd.c:801
 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:831
 __device_attach_driver+0x1df/0x350 drivers/base/dd.c:959
 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500
 __device_attach+0x1e4/0x4e0 drivers/base/dd.c:1031
 device_initial_probe+0xaa/0xc0 drivers/base/dd.c:1086
 bus_probe_device+0x64/0x150 drivers/base/bus.c:574
 device_add+0x116e/0x1980 drivers/base/core.c:3689
 usb_set_configuration+0x1187/0x1e50 drivers/usb/core/message.c:2210
 usb_generic_driver_probe+0xb1/0x110 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+0x241/0xb20 drivers/base/dd.c:659
 __driver_probe_device+0x1de/0x470 drivers/base/dd.c:801
 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:831
 __device_attach_driver+0x1df/0x350 drivers/base/dd.c:959
 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500
 __device_attach+0x1e4/0x4e0 drivers/base/dd.c:1031
 device_initial_probe+0xaa/0xc0 drivers/base/dd.c:1086
 bus_probe_device+0x64/0x150 drivers/base/bus.c:574
 device_add+0x116e/0x1980 drivers/base/core.c:3689
 usb_new_device+0xd07/0x1a90 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+0x313a/0x52f0 drivers/usb/core/hub.c:5953
 process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257
 process_scheduled_works kernel/workqueue.c:3340 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>

Allocated by task 5827:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
 kasan_save_track+0x14/0x30 mm/kasan/common.c:77
 unpoison_slab_object mm/kasan/common.c:339 [inline]
 __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:365
 kasan_slab_alloc include/linux/kasan.h:252 [inline]
 slab_post_alloc_hook mm/slub.c:4953 [inline]
 slab_alloc_node mm/slub.c:5263 [inline]
 kmem_cache_alloc_noprof+0x25e/0x770 mm/slub.c:5270
 lsm_inode_alloc security/security.c:228 [inline]
 security_inode_alloc+0x3b/0x2b0 security/security.c:1189
 inode_init_always_gfp+0xced/0x1040 fs/inode.c:306
 inode_init_always include/linux/fs.h:2883 [inline]
 alloc_inode+0x86/0x240 fs/inode.c:353
 new_inode+0x22/0x1c0 fs/inode.c:1175
 debugfs_get_inode fs/debugfs/inode.c:72 [inline]
 debugfs_create_dir+0xc4/0x470 fs/debugfs/inode.c:578
 nsim_dev_debugfs_init drivers/net/netdevsim/dev.c:349 [inline]
 nsim_drv_probe+0xccc/0x15c0 drivers/net/netdevsim/dev.c:1683
 call_driver_probe drivers/base/dd.c:581 [inline]
 really_probe+0x241/0xb20 drivers/base/dd.c:659
 __driver_probe_device+0x1de/0x470 drivers/base/dd.c:801
 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:831
 __device_attach_driver+0x1df/0x350 drivers/base/dd.c:959
 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500
 __device_attach+0x1e4/0x4e0 drivers/base/dd.c:1031
 device_initial_probe+0xaa/0xc0 drivers/base/dd.c:1086
 bus_probe_device+0x64/0x150 drivers/base/bus.c:574
 device_add+0x116e/0x1980 drivers/base/core.c:3689
 nsim_bus_dev_new drivers/net/netdevsim/bus.c:463 [inline]
 new_device_store+0x41b/0x730 drivers/net/netdevsim/bus.c:191
 bus_attr_store+0x74/0xb0 drivers/base/bus.c:172
 sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:142
 kernfs_fop_write_iter+0x3af/0x570 fs/kernfs/file.c:352
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x7d3/0x11d0 fs/read_write.c:686
 ksys_write+0x12a/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888055063f50
 which belongs to the cache lsm_inode_cache of size 80
The buggy address is located 95 bytes to the right of
 allocated 80-byte region [ffff888055063f50, ffff888055063fa0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880550633f0 pfn:0x55063
flags: 0xfff00000000200(workingset|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000200 ffff88801bafd280 ffffea00019f1ad0 ffffea00014c5a50
raw: ffff8880550633f0 0000000000240023 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5827, tgid 5827 (syz-executor), ts 102484955754, free_ts 36724503581
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1af/0x220 mm/page_alloc.c:1846
 prep_new_page mm/page_alloc.c:1854 [inline]
 get_page_from_freelist+0xd0b/0x31a0 mm/page_alloc.c:3915
 __alloc_frozen_pages_noprof+0x25f/0x2430 mm/page_alloc.c:5210
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2486
 alloc_slab_page mm/slub.c:3075 [inline]
 allocate_slab mm/slub.c:3248 [inline]
 new_slab+0x2c3/0x430 mm/slub.c:3302
 ___slab_alloc+0xe18/0x1c90 mm/slub.c:4656
 __slab_alloc.constprop.0+0x63/0x110 mm/slub.c:4779
 __slab_alloc_node mm/slub.c:4855 [inline]
 slab_alloc_node mm/slub.c:5251 [inline]
 kmem_cache_alloc_noprof+0x44d/0x770 mm/slub.c:5270
 lsm_inode_alloc security/security.c:228 [inline]
 security_inode_alloc+0x3b/0x2b0 security/security.c:1189
 inode_init_always_gfp+0xced/0x1040 fs/inode.c:306
 inode_init_always include/linux/fs.h:2883 [inline]
 alloc_inode+0x86/0x240 fs/inode.c:353
 new_inode_pseudo include/linux/fs.h:2964 [inline]
 sock_alloc+0x40/0x280 net/socket.c:637
 __sock_create+0xc2/0x8a0 net/socket.c:1569
 sock_create net/socket.c:1663 [inline]
 __sys_socket_create net/socket.c:1700 [inline]
 __sys_socket+0x14d/0x260 net/socket.c:1747
 __do_sys_socket net/socket.c:1761 [inline]
 __se_sys_socket net/socket.c:1759 [inline]
 __x64_sys_socket+0x72/0xb0 net/socket.c:1759
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
page last free pid 1 tgid 1 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 __free_frozen_pages+0x7df/0x1170 mm/page_alloc.c:2943
 __free_pages mm/page_alloc.c:5329 [inline]
 free_contig_range+0x183/0x4a0 mm/page_alloc.c:7197
 destroy_args+0xb95/0x14e0 mm/debug_vm_pgtable.c:983
 debug_vm_pgtable+0x2220/0x38d0 mm/debug_vm_pgtable.c:1372
 do_one_initcall+0x123/0x680 init/main.c:1378
 do_initcall_level init/main.c:1440 [inline]
 do_initcalls init/main.c:1456 [inline]
 do_basic_setup init/main.c:1475 [inline]
 kernel_init_freeable+0x5c8/0x920 init/main.c:1688
 kernel_init+0x1c/0x2b0 init/main.c:1578
 ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246

Memory state around the buggy address:
 ffff888055063e80: 00 00 00 00 00 00 00 00 fc fc fc fc 00 00 00 00
 ffff888055063f00: 00 00 00 00 00 00 fc fc fc fc 00 00 00 00 00 00
>ffff888055063f80: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc
                                                                ^
 ffff888055064000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888055064080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	e9 36 ff ff ff       	jmp    0xffffff3b
   5:	49 c7 c4 ea ff ff ff 	mov    $0xffffffffffffffea,%r12
   c:	eb c7                	jmp    0xffffffd5
   e:	e8 02 50 cd 09       	call   0x9cd5015
  13:	66 90                	xchg   %ax,%ax
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	90                   	nop
  1c:	90                   	nop
  1d:	90                   	nop
  1e:	90                   	nop
  1f:	90                   	nop
  20:	90                   	nop
  21:	90                   	nop
  22:	90                   	nop
  23:	90                   	nop
  24:	90                   	nop
  25:	f3 0f 1e fa          	endbr64
* 29:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax <-- trapping instruction
  30:	fc ff df
  33:	55                   	push   %rbp
  34:	53                   	push   %rbx
  35:	48 89 fb             	mov    %rdi,%rbx
  38:	48 83 c7 10          	add    $0x10,%rdi
  3c:	48 89 fa             	mov    %rdi,%rdx