==================================================================
BUG: KASAN: use-after-free in mcp2221_raw_event+0x1070/0x10a0 drivers/hid/hid-mcp2221.c:948
Read of size 1 at addr ffff888060a67fff by task syz.3.780/9027

CPU: 1 UID: 0 PID: 9027 Comm: syz.3.780 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
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+0x311/0x450 drivers/hid/hid-core.c:2130
 hid_irq_in+0x35e/0x870 drivers/hid/usbhid/hid-core.c:286
 __usb_hcd_giveback_urb+0x388/0x610 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+0x1ff/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:finish_task_switch.isra.0+0x22a/0xc10 kernel/sched/core.c:5225
Code: fb 09 00 00 44 8b 05 09 8c 22 0f 45 85 c0 0f 85 be 01 00 00 4c 89 e7 e8 a4 f6 ff ff e8 4f 65 3a 00 fb 65 48 8b 1d ae c3 4d 12 <48> 8d bb 18 16 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1
RSP: 0018:ffffc900038c76f0 EFLAGS: 00000202
RAX: 00000000000095f7 RBX: ffff88806d052440 RCX: ffffffff81c380af
RDX: 0000000000000000 RSI: ffffffff8de52fc1 RDI: ffffffff8c163380
RBP: ffffc900038c7738 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90ab7697 R11: 0000000000000000 R12: ffff8880b853a300
R13: ffff888023b74880 R14: ffff8880b843a300 R15: ffff8880b853b130
 context_switch kernel/sched/core.c:5360 [inline]
 __schedule+0x1198/0x5de0 kernel/sched/core.c:6961
 __schedule_loop kernel/sched/core.c:7043 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:7058
 schedule_timeout+0x257/0x290 kernel/time/sleep_timeout.c:75
 do_wait_for_common kernel/sched/completion.c:100 [inline]
 __wait_for_common+0x2ff/0x4e0 kernel/sched/completion.c:121
 rdmsr_safe_on_cpu+0x1dc/0x210 arch/x86/lib/msr-smp.c:181
 msr_read+0x19d/0x250 arch/x86/kernel/msr.c:66
 vfs_read+0x1e4/0xcf0 fs/read_write.c:570
 ksys_read+0x12a/0x250 fs/read_write.c:715
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7effd4b8eec9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007effd5abb038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007effd4de5fa0 RCX: 00007effd4b8eec9
RDX: 0000000000018ff8 RSI: 0000200000002700 RDI: 0000000000000004
RBP: 00007effd4c11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007effd4de6038 R14: 00007effd4de5fa0 R15: 00007ffdfc194438
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x2000000a9 pfn:0x60a67
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea000174f008 ffffea0001829988 0000000000000000
raw: 00000002000000a9 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 0x500cc2(GFP_HIGHUSER|__GFP_ACCOUNT), pid 8964, tgid 8962 (syz.3.763), ts 336138364474, free_ts 336138781959
 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_mpol+0x1fb/0x550 mm/mempolicy.c:2416
 alloc_frozen_pages_noprof mm/mempolicy.c:2487 [inline]
 alloc_pages_noprof+0x131/0x390 mm/mempolicy.c:2507
 anon_pipe_get_page fs/pipe.c:124 [inline]
 anon_pipe_write+0xbc2/0x1a90 fs/pipe.c:513
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x7d0/0x11d0 fs/read_write.c:686
 ksys_write+0x1f8/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 8963 tgid 8962 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
 __folio_put+0x329/0x450 mm/swap.c:112
 folio_put include/linux/mm.h:1360 [inline]
 put_page include/linux/mm.h:1429 [inline]
 anon_pipe_put_page fs/pipe.c:139 [inline]
 anon_pipe_buf_release+0x40a/0x520 fs/pipe.c:147
 pipe_buf_release include/linux/pipe_fs_i.h:282 [inline]
 pipe_update_tail fs/pipe.c:242 [inline]
 anon_pipe_read+0x5cd/0x1210 fs/pipe.c:361
 io_iter_do_read io_uring/rw.c:828 [inline]
 __io_read+0x354/0x14a0 io_uring/rw.c:944
 io_read+0x1e/0x70 io_uring/rw.c:1023
 __io_issue_sqe+0xe5/0x7c0 io_uring/io_uring.c:1771
 io_issue_sqe+0x86/0xe50 io_uring/io_uring.c:1794
 io_queue_sqe io_uring/io_uring.c:2023 [inline]
 io_submit_sqe io_uring/io_uring.c:2283 [inline]
 io_submit_sqes+0x94b/0x25c0 io_uring/io_uring.c:2396
 __do_sys_io_uring_enter+0xd6a/0x1630 io_uring/io_uring.c:3463
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888060a67e80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888060a67f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888060a67f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                                ^
 ffff888060a68000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888060a68080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess):
   0:	fb                   	sti
   1:	09 00                	or     %eax,(%rax)
   3:	00 44 8b 05          	add    %al,0x5(%rbx,%rcx,4)
   7:	09 8c 22 0f 45 85 c0 	or     %ecx,-0x3f7abaf1(%rdx,%riz,1)
   e:	0f 85 be 01 00 00    	jne    0x1d2
  14:	4c 89 e7             	mov    %r12,%rdi
  17:	e8 a4 f6 ff ff       	call   0xfffff6c0
  1c:	e8 4f 65 3a 00       	call   0x3a6570
  21:	fb                   	sti
  22:	65 48 8b 1d ae c3 4d 	mov    %gs:0x124dc3ae(%rip),%rbx        # 0x124dc3d8
  29:	12
* 2a:	48 8d bb 18 16 00 00 	lea    0x1618(%rbx),%rdi <-- trapping instruction
  31:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  38:	fc ff df
  3b:	48 89 fa             	mov    %rdi,%rdx
  3e:	48                   	rex.W
  3f:	c1                   	.byte 0xc1