==================================================================
BUG: KASAN: slab-out-of-bounds in mcp2221_raw_event+0x10b0/0x12a0 drivers/hid/hid-mcp2221.c:964
Read of size 1 at addr ffff8880a424bfff by task syz.4.4543/22305

CPU: 1 UID: 0 PID: 22305 Comm: syz.4.4543 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 <IRQ>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description+0x55/0x1e0 mm/kasan/report.c:378
 print_report+0x58/0x70 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 mcp2221_raw_event+0x10b0/0x12a0 drivers/hid/hid-mcp2221.c:964
 __hid_input_report+0x428/0x590 drivers/hid/hid-core.c:2161
 hid_irq_in+0x495/0x710 drivers/hid/usbhid/hid-core.c:286
 __usb_hcd_giveback_urb+0x376/0x540 drivers/usb/core/hcd.c:1655
 dummy_timer+0xbc0/0x4650 drivers/usb/gadget/udc/dummy_hcd.c:2005
 __run_hrtimer kernel/time/hrtimer.c:1930 [inline]
 __hrtimer_run_queues+0x3c0/0xa20 kernel/time/hrtimer.c:1994
 hrtimer_run_softirq+0x17a/0x240 kernel/time/hrtimer.c:2011
 handle_softirqs+0x22a/0x840 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:752
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1061
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x221/0x350 kernel/locking/lockdep.c:5872
Code: ff ff ff e8 31 bf 05 0a f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 0b 9a 96 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d 18 e3 91
RSP: 0018:ffffc900057479a8 EFLAGS: 00000282
RAX: 3f15c861b0553000 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 000000001e0a8a00 RSI: ffffffff8e216dde RDI: ffffffff8c28b8e0
RBP: ffffffff8218905f R08: ffffffff8218905f R09: ffff8880206c6538
R10: ffffc90005747aa0 R11: fffff52000ae8f5b R12: 0000000000000001
R13: ffff8880206c6538 R14: 0000000000000001 R15: 0000000000000246
 __might_fault+0xcb/0x130 mm/memory.c:7340
 _inline_copy_from_user include/linux/uaccess.h:169 [inline]
 _copy_from_user+0x28/0xb0 lib/usercopy.c:18
 copy_from_user include/linux/uaccess.h:223 [inline]
 copy_msghdr_from_user net/socket.c:2628 [inline]
 recvmsg_copy_msghdr net/socket.c:2884 [inline]
 ___sys_recvmsg+0x175/0x590 net/socket.c:2956
 do_recvmmsg+0x334/0x800 net/socket.c:3055
 __sys_recvmmsg net/socket.c:3129 [inline]
 __do_sys_recvmmsg net/socket.c:3152 [inline]
 __se_sys_recvmmsg net/socket.c:3145 [inline]
 __x64_sys_recvmmsg+0x198/0x250 net/socket.c:3145
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f55bd99ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f55be859028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f55bdc16090 RCX: 00007f55bd99ce59
RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000004
RBP: 00007f55bda32d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f55bdc16128 R14: 00007f55bdc16090 R15: 00007f55bdd3fa48
 </TASK>

Allocated by task 22078:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 unpoison_slab_object mm/kasan/common.c:340 [inline]
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4570 [inline]
 slab_alloc_node mm/slub.c:4899 [inline]
 kmem_cache_alloc_noprof+0x2bc/0x650 mm/slub.c:4906
 __kernfs_new_node+0xea/0x970 fs/kernfs/dir.c:664
 kernfs_new_node+0x102/0x210 fs/kernfs/dir.c:748
 __kernfs_create_file+0x4b/0x2e0 fs/kernfs/file.c:1057
 sysfs_add_file_mode_ns+0x238/0x300 fs/sysfs/file.c:313
 create_files fs/sysfs/group.c:82 [inline]
 internal_create_group+0x673/0x1190 fs/sysfs/group.c:189
 internal_create_groups fs/sysfs/group.c:229 [inline]
 sysfs_create_groups+0x59/0x120 fs/sysfs/group.c:255
 device_add_groups drivers/base/core.c:2837 [inline]
 device_add_attrs+0x1bf/0x5b0 drivers/base/core.c:2912
 device_add+0x496/0xbb0 drivers/base/core.c:3645
 netdev_register_kobject+0x178/0x310 net/core/net-sysfs.c:2343
 register_netdevice+0x1456/0x1ec0 net/core/dev.c:11423
 register_netdev+0x40/0x60 net/core/dev.c:11539
 loopback_net_init+0x75/0x150 drivers/net/loopback.c:218
 ops_init+0x35c/0x5c0 net/core/net_namespace.c:137
 setup_net+0x118/0x340 net/core/net_namespace.c:446
 copy_net_ns+0x50e/0x730 net/core/net_namespace.c:579
 create_new_namespaces+0x3e7/0x6a0 kernel/nsproxy.c:132
 copy_namespaces+0x438/0x4b0 kernel/nsproxy.c:195
 copy_process+0x1f49/0x4440 kernel/fork.c:2267
 kernel_clone+0x2d7/0x940 kernel/fork.c:2722
 __do_sys_clone kernel/fork.c:2863 [inline]
 __se_sys_clone kernel/fork.c:2847 [inline]
 __x64_sys_clone+0x1b6/0x230 kernel/fork.c:2847
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 15:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:253 [inline]
 __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2689 [inline]
 slab_free mm/slub.c:6251 [inline]
 kmem_cache_free+0x182/0x650 mm/slub.c:6378
 rcu_do_batch kernel/rcu/tree.c:2617 [inline]
 rcu_core+0x7cd/0x1070 kernel/rcu/tree.c:2869
 handle_softirqs+0x22a/0x840 kernel/softirq.c:622
 run_ksoftirqd+0x36/0x60 kernel/softirq.c:1076
 smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160
 kthread+0x389/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Last potentially related work creation:
 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
 __call_rcu_common kernel/rcu/tree.c:3131 [inline]
 call_rcu+0xee/0x890 kernel/rcu/tree.c:3251
 kernfs_put+0x259/0x520 fs/kernfs/dir.c:618
 kernfs_remove_by_name_ns+0xc8/0x140 fs/kernfs/dir.c:1799
 kernfs_remove_by_name include/linux/kernfs.h:639 [inline]
 remove_files fs/sysfs/group.c:28 [inline]
 sysfs_remove_group+0xfc/0x2e0 fs/sysfs/group.c:328
 sysfs_remove_groups+0x54/0xb0 fs/sysfs/group.c:352
 device_remove_groups drivers/base/core.c:2844 [inline]
 device_remove_attrs+0x1cb/0x280 drivers/base/core.c:2974
 device_del+0x51f/0x8f0 drivers/base/core.c:3894
 unregister_netdevice_many_notify+0x1d5f/0x22c0 net/core/dev.c:12456
 unregister_netdevice_many net/core/dev.c:12484 [inline]
 default_device_exit_batch+0x962/0x9e0 net/core/dev.c:13076
 ops_exit_list net/core/net_namespace.c:205 [inline]
 ops_undo_list+0x52b/0x940 net/core/net_namespace.c:252
 cleanup_net+0x56b/0x800 net/core/net_namespace.c:702
 process_one_work kernel/workqueue.c:3314 [inline]
 process_scheduled_works+0xb5d/0x1860 kernel/workqueue.c:3397
 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3478
 kthread+0x389/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

The buggy address belongs to the object at ffff8880a424bf00
 which belongs to the cache kernfs_node_cache of size 176
The buggy address is located 79 bytes to the right of
 allocated 176-byte region [ffff8880a424bf00, ffff8880a424bfb0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xa424b
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801c2be000 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800110011 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 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 20412, tgid 20412 (syz-executor), ts 1043034883249, free_ts 1042847714546
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x22d/0x280 mm/page_alloc.c:1853
 prep_new_page mm/page_alloc.c:1861 [inline]
 get_page_from_freelist+0x2593/0x2610 mm/page_alloc.c:3941
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5221
 alloc_slab_page mm/slub.c:3278 [inline]
 allocate_slab+0x77/0x660 mm/slub.c:3467
 new_slab mm/slub.c:3525 [inline]
 refill_objects+0x339/0x3d0 mm/slub.c:7272
 refill_sheaf mm/slub.c:2816 [inline]
 __pcs_replace_empty_main+0x321/0x720 mm/slub.c:4652
 alloc_from_pcs mm/slub.c:4750 [inline]
 slab_alloc_node mm/slub.c:4884 [inline]
 kmem_cache_alloc_noprof+0x37d/0x650 mm/slub.c:4906
 __kernfs_new_node+0xea/0x970 fs/kernfs/dir.c:664
 kernfs_new_node+0x102/0x210 fs/kernfs/dir.c:748
 __kernfs_create_file+0x4b/0x2e0 fs/kernfs/file.c:1057
 sysfs_add_file_mode_ns+0x238/0x300 fs/sysfs/file.c:313
 create_files fs/sysfs/group.c:82 [inline]
 internal_create_group+0x673/0x1190 fs/sysfs/group.c:189
 internal_create_groups fs/sysfs/group.c:229 [inline]
 sysfs_create_groups+0x59/0x120 fs/sysfs/group.c:255
 device_add_groups drivers/base/core.c:2837 [inline]
 device_add_attrs+0xdd/0x5b0 drivers/base/core.c:2901
 device_add+0x496/0xbb0 drivers/base/core.c:3645
 netdev_register_kobject+0x178/0x310 net/core/net-sysfs.c:2343
page last free pid 20480 tgid 20480 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1397 [inline]
 __free_frozen_pages+0xc1c/0xd30 mm/page_alloc.c:2938
 vfree+0x1d1/0x2f0 mm/vmalloc.c:3472
 kvm_arch_free_memslot+0x13e/0x170 arch/x86/kvm/x86.c:13556
 kvm_free_memslot virt/kvm/kvm_main.c:942 [inline]
 kvm_free_memslots+0x15b/0x200 virt/kvm/kvm_main.c:963
 kvm_destroy_vm virt/kvm/kvm_main.c:1298 [inline]
 kvm_put_kvm+0x8b2/0xa50 virt/kvm/kvm_main.c:1331
 kvm_vm_release+0x43/0x50 virt/kvm/kvm_main.c:1354
 __fput+0x44f/0xa60 fs/file_table.c:510
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
 exit_to_user_mode_loop+0x193/0x680 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x353/0x580 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff8880a424be80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff8880a424bf00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880a424bf80: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc
                                                                ^
 ffff8880a424c000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880a424c080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	ff                   	ljmp   (bad)
   1:	e8 31 bf 05 0a       	call   0xa05bf37
   6:	f7 44 24 08 00 02 00 	testl  $0x200,0x8(%rsp)
   d:	00
   e:	0f 84 3a ff ff ff    	je     0xffffff4e
  14:	65 48 8b 05 0b 9a 96 	mov    %gs:0x11969a0b(%rip),%rax        # 0x11969a27
  1b:	11
  1c:	48 3b 44 24 58       	cmp    0x58(%rsp),%rax
  21:	75 33                	jne    0x56
  23:	fb                   	sti
  24:	48 83 c4 60          	add    $0x60,%rsp
* 28:	5b                   	pop    %rbx <-- trapping instruction
  29:	41 5c                	pop    %r12
  2b:	41 5d                	pop    %r13
  2d:	41 5e                	pop    %r14
  2f:	41 5f                	pop    %r15
  31:	5d                   	pop    %rbp
  32:	c3                   	ret
  33:	cc                   	int3
  34:	cc                   	int3
  35:	cc                   	int3
  36:	cc                   	int3
  37:	cc                   	int3
  38:	48                   	rex.W
  39:	8d                   	.byte 0x8d
  3a:	3d                   	.byte 0x3d
  3b:	18 e3                	sbb    %ah,%bl
  3d:	91                   	xchg   %eax,%ecx