==================================================================
BUG: KASAN: slab-out-of-bounds in mcp2221_raw_event+0x10b0/0x12a0 drivers/hid/hid-mcp2221.c:964
Read of size 1 at addr ffff8880549ebfff by task syz.3.161/6429

CPU: 0 UID: 0 PID: 6429 Comm: syz.3.161 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+0x41c/0x580 drivers/hid/hid-core.c:2161
 hid_irq_in+0x492/0x710 drivers/hid/usbhid/hid-core.c:287
 __usb_hcd_giveback_urb+0x374/0x530 drivers/usb/core/hcd.c:1657
 dummy_timer+0xac3/0x4b40 drivers/usb/gadget/udc/dummy_hcd.c:2005
 __run_hrtimer kernel/time/hrtimer.c:2032 [inline]
 __hrtimer_run_queues+0x3bc/0xa10 kernel/time/hrtimer.c:2096
 hrtimer_run_softirq+0x17a/0x240 kernel/time/hrtimer.c:2113
 handle_softirqs+0x225/0x840 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:1062 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:mem_cgroup_lruvec include/linux/memcontrol.h:706 [inline]
RIP: 0010:lruvec_stat_mod_folio+0x1f1/0x3e0 mm/memcontrol.c:992
Code: 03 80 3c 28 00 74 08 4c 89 f7 e8 fa 2f f8 ff 4d 8b 26 49 83 c4 48 4d 8d ac 24 58 06 00 00 4d 89 ee 49 c1 ee 03 41 80 3c 2e 00 <74> 08 4c 89 ef e8 d5 2f f8 ff 4d 39 7d 00 0f 85 0e 01 00 00 41 80
RSP: 0018:ffffc90006cd70e8 EFLAGS: 00000246
RAX: 1ffff110038ddda6 RBX: ffffffff823bb4fe RCX: 0000000080000001
RDX: 00000000e45cbcbe RSI: ffffffff8e25db1e RDI: ffffffff8c2ab780
RBP: dffffc0000000000 R08: ffffffff823bb4fe R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8e959c20 R12: ffff88801d6cba08
R13: ffff88801d6cc060 R14: 1ffff11003ad980c R15: ffff88813fffb140
 __folio_mod_stat mm/rmap.c:1336 [inline]
 __folio_remove_rmap mm/rmap.c:1873 [inline]
 folio_remove_rmap_ptes+0x343/0xe40 mm/rmap.c:1900
 try_to_migrate_one+0x1ac9/0x2ac0 mm/rmap.c:2720
 rmap_walk_anon+0x5e3/0x7d0 mm/rmap.c:3001
 try_to_migrate+0x33d/0x400 mm/rmap.c:-1
 migrate_folio_unmap mm/migrate.c:1328 [inline]
 migrate_pages_batch+0x1c00/0x4e50 mm/migrate.c:1907
 migrate_pages_sync mm/migrate.c:2024 [inline]
 migrate_pages+0x1b9f/0x2920 mm/migrate.c:2133
 do_mbind mm/mempolicy.c:1614 [inline]
 kernel_mbind mm/mempolicy.c:1757 [inline]
 __do_sys_mbind mm/mempolicy.c:1831 [inline]
 __se_sys_mbind+0xe82/0x10e0 mm/mempolicy.c:1827
 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: 0033:0x7fc9f919ce59
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:00007fc9f9f89028 EFLAGS: 00000246 ORIG_RAX: 00000000000000ed
RAX: ffffffffffffffda RBX: 00007fc9f9416090 RCX: 00007fc9f919ce59
RDX: 0000000000000000 RSI: 0000000000800000 RDI: 0000200000001000
RBP: 00007fc9f9232e6f R08: 0000000000000000 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc9f9416128 R14: 00007fc9f9416090 R15: 00007fc9f953fa48
 </TASK>

Allocated by task 6292:
 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:4612 [inline]
 slab_alloc_node mm/slub.c:4945 [inline]
 kmem_cache_alloc_node_noprof+0x355/0x610 mm/slub.c:5017
 kmalloc_reserve net/core/skbuff.c:615 [inline]
 __alloc_skb+0x276/0x7a0 net/core/skbuff.c:715
 alloc_skb include/linux/skbuff.h:1384 [inline]
 alloc_uevent_skb+0x7d/0x230 lib/kobject_uevent.c:289
 uevent_net_broadcast_tagged lib/kobject_uevent.c:352 [inline]
 kobject_uevent_net_broadcast+0x184/0x560 lib/kobject_uevent.c:415
 kobject_uevent_env+0x566/0x9e0 lib/kobject_uevent.c:611
 netdev_queue_add_kobject net/core/net-sysfs.c:1992 [inline]
 netdev_queue_update_kobjects+0x33a/0x6b0 net/core/net-sysfs.c:2035
 register_queue_kobjects net/core/net-sysfs.c:2098 [inline]
 netdev_register_kobject+0x258/0x310 net/core/net-sysfs.c:2341
 register_netdevice+0x1433/0x1eb0 net/core/dev.c:11440
 vxcan_newlink+0x491/0x5d0 drivers/net/can/vxcan.c:262
 rtnl_newlink_create+0x310/0xb00 net/core/rtnetlink.c:3913
 __rtnl_newlink net/core/rtnetlink.c:4044 [inline]
 rtnl_newlink+0x167f/0x1bd0 net/core/rtnetlink.c:4159
 rtnetlink_rcv_msg+0x802/0xc00 net/core/rtnetlink.c:7076
 netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2556
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x7bb/0x940 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1900
 sock_sendmsg_nosec+0x13a/0x180 net/socket.c:775
 __sock_sendmsg net/socket.c:790 [inline]
 __sys_sendto+0x408/0x5a0 net/socket.c:2252
 __do_sys_sendto net/socket.c:2259 [inline]
 __se_sys_sendto net/socket.c:2255 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2255
 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 6292:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 kasan_save_free_info+0x40/0x50 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:2705 [inline]
 slab_free mm/slub.c:6405 [inline]
 kfree+0x1c5/0x640 mm/slub.c:6720
 skb_kfree_head net/core/skbuff.c:1077 [inline]
 skb_free_head net/core/skbuff.c:1089 [inline]
 skb_release_data+0x85e/0xab0 net/core/skbuff.c:1116
 skb_release_all net/core/skbuff.c:1191 [inline]
 __kfree_skb+0x5d/0x210 net/core/skbuff.c:1205
 netlink_broadcast_filtered+0xd9d/0xea0 net/netlink/af_netlink.c:1541
 netlink_broadcast+0x37/0x50 net/netlink/af_netlink.c:1563
 uevent_net_broadcast_tagged lib/kobject_uevent.c:373 [inline]
 kobject_uevent_net_broadcast+0x4bc/0x560 lib/kobject_uevent.c:415
 kobject_uevent_env+0x566/0x9e0 lib/kobject_uevent.c:611
 netdev_queue_add_kobject net/core/net-sysfs.c:1992 [inline]
 netdev_queue_update_kobjects+0x33a/0x6b0 net/core/net-sysfs.c:2035
 register_queue_kobjects net/core/net-sysfs.c:2098 [inline]
 netdev_register_kobject+0x258/0x310 net/core/net-sysfs.c:2341
 register_netdevice+0x1433/0x1eb0 net/core/dev.c:11440
 vxcan_newlink+0x491/0x5d0 drivers/net/can/vxcan.c:262
 rtnl_newlink_create+0x310/0xb00 net/core/rtnetlink.c:3913
 __rtnl_newlink net/core/rtnetlink.c:4044 [inline]
 rtnl_newlink+0x167f/0x1bd0 net/core/rtnetlink.c:4159
 rtnetlink_rcv_msg+0x802/0xc00 net/core/rtnetlink.c:7076
 netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2556
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x7bb/0x940 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1900
 sock_sendmsg_nosec+0x13a/0x180 net/socket.c:775
 __sock_sendmsg net/socket.c:790 [inline]
 __sys_sendto+0x408/0x5a0 net/socket.c:2252
 __do_sys_sendto net/socket.c:2259 [inline]
 __se_sys_sendto net/socket.c:2255 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2255
 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

The buggy address belongs to the object at ffff8880549eba80
 which belongs to the cache skbuff_small_head of size 704
The buggy address is located 703 bytes to the right of
 allocated 704-byte region [ffff8880549eba80, ffff8880549ebd40)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x549e8
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801f6d8b40 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800130013 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801f6d8b40 dead000000000100 dead000000000122
head: 0000000000000000 0000000800130013 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffffffffffff01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 68, tgid 68 (kworker/u8:4), ts 85932790162, free_ts 24879091431
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1859
 prep_new_page mm/page_alloc.c:1867 [inline]
 get_page_from_freelist+0x21fa/0x2270 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5304
 alloc_slab_page mm/slub.c:3294 [inline]
 allocate_slab+0x79/0x5e0 mm/slub.c:3408
 new_slab mm/slub.c:3454 [inline]
 refill_objects+0x2d5/0x350 mm/slub.c:7338
 refill_sheaf mm/slub.c:2832 [inline]
 __pcs_replace_empty_main+0x2bf/0x6b0 mm/slub.c:4703
 alloc_from_pcs mm/slub.c:4801 [inline]
 slab_alloc_node mm/slub.c:4933 [inline]
 kmem_cache_alloc_node_noprof+0x42f/0x610 mm/slub.c:5017
 kmalloc_reserve net/core/skbuff.c:615 [inline]
 __alloc_skb+0x276/0x7a0 net/core/skbuff.c:715
 alloc_skb include/linux/skbuff.h:1384 [inline]
 ndisc_alloc_skb+0xa0/0x480 net/ipv6/ndisc.c:420
 ndisc_ns_create+0x21c/0x650 net/ipv6/ndisc.c:626
 ndisc_send_ns+0xba/0x160 net/ipv6/ndisc.c:668
 addrconf_dad_work+0xa8d/0x15c0 net/ipv6/addrconf.c:4317
 process_one_work kernel/workqueue.c:3322 [inline]
 process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
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:1406 [inline]
 free_pages_prepare+0x960/0xa60 mm/page_alloc.c:1451
 __free_contig_range_common+0x174/0x340 mm/page_alloc.c:6897
 destroy_args+0x4e5/0x570 mm/debug_vm_pgtable.c:993
 debug_vm_pgtable+0x3f8/0x410 mm/debug_vm_pgtable.c:1368
 do_one_initcall+0x250/0x870 init/main.c:1347
 do_initcall_level+0x10a/0x1a0 init/main.c:1409
 do_initcalls+0x59/0xa0 init/main.c:1425
 kernel_init_freeable+0x29d/0x3e0 init/main.c:1658
 kernel_init+0x1d/0x1d0 init/main.c:1548
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Memory state around the buggy address:
 ffff8880549ebe80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880549ebf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880549ebf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                                                ^
 ffff8880549ec000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880549ec080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess):
   0:	03 80 3c 28 00 74    	add    0x7400283c(%rax),%eax
   6:	08 4c 89 f7          	or     %cl,-0x9(%rcx,%rcx,4)
   a:	e8 fa 2f f8 ff       	call   0xfff83009
   f:	4d 8b 26             	mov    (%r14),%r12
  12:	49 83 c4 48          	add    $0x48,%r12
  16:	4d 8d ac 24 58 06 00 	lea    0x658(%r12),%r13
  1d:	00
  1e:	4d 89 ee             	mov    %r13,%r14
  21:	49 c1 ee 03          	shr    $0x3,%r14
  25:	41 80 3c 2e 00       	cmpb   $0x0,(%r14,%rbp,1)
* 2a:	74 08                	je     0x34 <-- trapping instruction
  2c:	4c 89 ef             	mov    %r13,%rdi
  2f:	e8 d5 2f f8 ff       	call   0xfff83009
  34:	4d 39 7d 00          	cmp    %r15,0x0(%r13)
  38:	0f 85 0e 01 00 00    	jne    0x14c
  3e:	41                   	rex.B
  3f:	80                   	.byte 0x80