==================================================================
BUG: KASAN: use-after-free in mcp2221_raw_event+0x1070/0x10a0 drivers/hid/hid-mcp2221.c:948
Read of size 1 at addr ffff88805cf9ffff by task udevd/5870

CPU: 1 UID: 0 PID: 5870 Comm: udevd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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+0x314/0x450 drivers/hid/hid-core.c:2130
 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+0x1814/0x3a30 drivers/usb/gadget/udc/dummy_hcd.c:1995
 __run_hrtimer kernel/time/hrtimer.c:1761 [inline]
 __hrtimer_run_queues+0x202/0xad0 kernel/time/hrtimer.c:1825
 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1842
 handle_softirqs+0x219/0x8e0 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:acl_permission_check fs/namei.c:405 [inline]
RIP: 0010:generic_permission+0x4e1/0x7d0 fs/namei.c:472
Code: 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 e6 02 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 7b 28 49 8d 7f 50 48 89 fa <48> c1 ea 03 80 3c 02 00 0f 85 b9 02 00 00 49 8b 47 50 31 ff 25 00
RSP: 0018:ffffc9000218faa8 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: ffff88807a152d48 RCX: ffffffff82364dff
RDX: ffff88807d916050 RSI: ffffffff82365238 RDI: ffff88807d916050
RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 00000000000041ed
R13: 0000000000000001 R14: 00000000ffffbe12 R15: ffff88807d916000
 kernfs_iop_permission+0x8a/0xc0 fs/kernfs/inode.c:291
 do_inode_permission fs/namei.c:526 [inline]
 inode_permission+0x37a/0x630 fs/namei.c:593
 may_lookup fs/namei.c:1851 [inline]
 link_path_walk+0x9a4/0xe20 fs/namei.c:2445
 path_lookupat+0x15a/0x6d0 fs/namei.c:2653
 filename_lookup+0x224/0x5f0 fs/namei.c:2683
 user_path_at+0x3a/0x60 fs/namei.c:3127
 do_faccessat+0x139/0xba0 fs/open.c:493
 __do_sys_faccessat2 fs/open.c:547 [inline]
 __se_sys_faccessat2 fs/open.c:544 [inline]
 __x64_sys_faccessat2+0x96/0x100 fs/open.c:544
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc47db115da
Code: e8 7b 54 fe ff 44 39 f0 0f 85 74 ff ff ff 44 89 fe 4c 89 ef e8 f7 fc ff ff 89 c5 e9 31 ff ff ff 41 89 ca b8 b7 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 06 c3 0f 1f 44 00 00 48 8b 15 e9 f7 0d 00 f7
RSP: 002b:00007ffe078a85c8 EFLAGS: 00000206 ORIG_RAX: 00000000000001b7
RAX: ffffffffffffffda RBX: 000000000000000b RCX: 00007fc47db115da
RDX: 0000000000000000 RSI: 00007fc47e217e2e RDI: 000000000000000b
RBP: 000055ad56f8da50 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007fc47e217e2e R14: 0000000000000000 R15: 0000000000000009
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5cf9f
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f0(buddy)
raw: 00fff00000000000 ffffea00012ea488 ffffea000173d348 0000000000000000
raw: 0000000000000000 0000000000000000 00000000f0000000 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 0xcc0(GFP_KERNEL), pid 11416, tgid 11414 (syz.2.1396), ts 743206450900, free_ts 787067767970
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1851
 prep_new_page mm/page_alloc.c:1859 [inline]
 get_page_from_freelist+0x132b/0x38e0 mm/page_alloc.c:3858
 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:5148
 __alloc_pages_noprof mm/page_alloc.c:5182 [inline]
 alloc_pages_bulk_noprof+0x71c/0x1410 mm/page_alloc.c:5102
 ___alloc_pages_bulk mm/kasan/shadow.c:345 [inline]
 __kasan_populate_vmalloc mm/kasan/shadow.c:369 [inline]
 kasan_populate_vmalloc+0xf1/0x1f0 mm/kasan/shadow.c:418
 alloc_vmap_area+0x959/0x29c0 mm/vmalloc.c:2092
 __get_vm_area_node+0x1ca/0x330 mm/vmalloc.c:3187
 get_vm_area_caller+0x71/0xa0 mm/vmalloc.c:3238
 vmap+0x135/0x320 mm/vmalloc.c:3510
 bpf_ringbuf_area_alloc kernel/bpf/ringbuf.c:135 [inline]
 bpf_ringbuf_alloc kernel/bpf/ringbuf.c:173 [inline]
 ringbuf_map_alloc kernel/bpf/ringbuf.c:208 [inline]
 ringbuf_map_alloc+0x3da/0x7f0 kernel/bpf/ringbuf.c:190
 map_create+0x592/0x1f80 kernel/bpf/syscall.c:1480
 __sys_bpf+0x44d2/0x4de0 kernel/bpf/syscall.c:6011
 __do_sys_bpf kernel/bpf/syscall.c:6139 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6137 [inline]
 __x64_sys_bpf+0x78/0xc0 kernel/bpf/syscall.c:6137
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 10 tgid 10 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 __free_frozen_pages+0x7d5/0x10f0 mm/page_alloc.c:2895
 kasan_depopulate_vmalloc_pte+0x5b/0x80 mm/kasan/shadow.c:478
 apply_to_pte_range mm/memory.c:3015 [inline]
 apply_to_pmd_range mm/memory.c:3059 [inline]
 apply_to_pud_range mm/memory.c:3095 [inline]
 apply_to_p4d_range mm/memory.c:3131 [inline]
 __apply_to_page_range+0xac1/0x13f0 mm/memory.c:3167
 kasan_release_vmalloc+0xd1/0xe0 mm/kasan/shadow.c:599
 kasan_release_vmalloc_node mm/vmalloc.c:2249 [inline]
 purge_vmap_node+0x1c4/0xa30 mm/vmalloc.c:2266
 __purge_vmap_area_lazy+0xa06/0xc60 mm/vmalloc.c:2356
 drain_vmap_area_work+0x27/0x40 mm/vmalloc.c:2390
 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Memory state around the buggy address:
 ffff88805cf9fe80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88805cf9ff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88805cf9ff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                                ^
 ffff88805cfa0000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88805cfa0080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess), 7 bytes skipped:
   0:	48 c1 ea 03          	shr    $0x3,%rdx
   4:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   8:	0f 85 e6 02 00 00    	jne    0x2f4
   e:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  15:	fc ff df
  18:	4c 8b 7b 28          	mov    0x28(%rbx),%r15
  1c:	49 8d 7f 50          	lea    0x50(%r15),%rdi
  20:	48 89 fa             	mov    %rdi,%rdx
* 23:	48 c1 ea 03          	shr    $0x3,%rdx <-- trapping instruction
  27:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
  2b:	0f 85 b9 02 00 00    	jne    0x2ea
  31:	49 8b 47 50          	mov    0x50(%r15),%rax
  35:	31 ff                	xor    %edi,%edi
  37:	25                   	.byte 0x25