==================================================================
BUG: KASAN: use-after-free in mcp2221_raw_event+0x103c/0x10a0 drivers/hid/hid-mcp2221.c:948
Read of size 1 at addr ffff888142e63fff by task kworker/0:2/5212

CPU: 0 UID: 0 PID: 5212 Comm: kworker/0:2 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: events legacy_dvb_usb_read_remote_control
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0x156/0x4c9 mm/kasan/report.c:482
 kasan_report+0xdf/0x1e0 mm/kasan/report.c:595
 mcp2221_raw_event+0x103c/0x10a0 drivers/hid/hid-mcp2221.c:948
 __hid_input_report.constprop.0+0x314/0x460 drivers/hid/hid-core.c:2139
 hid_irq_in+0x52e/0x6b0 drivers/hid/usbhid/hid-core.c:286
 __usb_hcd_giveback_urb+0x38d/0x610 drivers/usb/core/hcd.c:1657
 usb_hcd_giveback_urb+0x3ca/0x4a0 drivers/usb/core/hcd.c:1741
 dummy_timer+0xd85/0x3670 drivers/usb/gadget/udc/dummy_hcd.c:1995
 __run_hrtimer kernel/time/hrtimer.c:1785 [inline]
 __hrtimer_run_queues+0x50e/0xa70 kernel/time/hrtimer.c:1849
 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1866
 handle_softirqs+0x1de/0x9d0 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xed/0x150 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+0x8f/0xb0 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:console_flush_one_record+0xac3/0xe50 kernel/printk/printk.c:3270
Code: 00 e8 51 5d 28 00 9c 5d 81 e5 00 02 00 00 31 ff 48 89 ee e8 7f 65 20 00 48 85 ed 0f 85 d7 01 00 00 e8 91 6a 20 00 fb 4c 89 e8 <48> c1 e8 03 42 80 3c 38 00 0f 85 64 03 00 00 48 8b 0c 24 48 8b 6b
RSP: 0018:ffffc9000322f830 EFLAGS: 00000293
RAX: ffffffff89c75f58 RBX: ffffffff89c75f00 RCX: ffffffff81914f61
RDX: ffff888118d03a00 RSI: ffffffff81914f6f RDI: ffff888118d03a00
RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 000000000002f548
R13: ffffffff89c75f58 R14: ffffc9000322f8b0 R15: dffffc0000000000
 console_flush_all kernel/printk/printk.c:3343 [inline]
 __console_flush_and_unlock kernel/printk/printk.c:3373 [inline]
 console_unlock+0x103/0x260 kernel/printk/printk.c:3413
 vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2479
 _printk+0xcf/0x110 kernel/printk/printk.c:2504
 legacy_dvb_usb_read_remote_control.cold+0x11/0x16 drivers/media/usb/dvb-usb/dvb-usb-remote.c:124
 process_one_work+0x9d7/0x1920 kernel/workqueue.c:3275
 process_scheduled_works kernel/workqueue.c:3358 [inline]
 worker_thread+0x5da/0xe40 kernel/workqueue.c:3439
 kthread+0x370/0x450 kernel/kthread.c:467
 ret_from_fork+0x6c3/0xcb0 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888100000000 pfn:0x142e63
flags: 0x200000000000000(node=0|zone=2)
raw: 0200000000000000 dead000000000100 dead000000000122 0000000000000000
raw: ffff888100000000 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 0x440dc0(GFP_KERNEL_ACCOUNT|__GFP_ZERO|__GFP_COMP), pid 2968, tgid 2968 (syz-executor), ts 1703671099649, free_ts 1706853718778
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x153/0x170 mm/page_alloc.c:1889
 prep_new_page mm/page_alloc.c:1897 [inline]
 get_page_from_freelist+0xf10/0x39f0 mm/page_alloc.c:3962
 __alloc_frozen_pages_noprof+0x273/0x2860 mm/page_alloc.c:5250
 alloc_pages_mpol+0xe8/0x410 mm/mempolicy.c:2484
 alloc_frozen_pages_noprof mm/mempolicy.c:2555 [inline]
 alloc_pages_noprof+0x131/0x390 mm/mempolicy.c:2575
 pagetable_alloc_noprof include/linux/mm.h:3404 [inline]
 __pte_alloc_one_noprof include/asm-generic/pgalloc.h:76 [inline]
 pte_alloc_one+0x1e/0x3e0 arch/x86/mm/pgtable.c:18
 __pte_alloc+0x6d/0x3f0 mm/memory.c:466
 copy_pte_range mm/memory.c:1250 [inline]
 copy_pmd_range mm/memory.c:1405 [inline]
 copy_pud_range mm/memory.c:1442 [inline]
 copy_p4d_range mm/memory.c:1466 [inline]
 copy_page_range+0x1643/0x2630 mm/memory.c:1552
 dup_mmap+0xcb9/0x1f30 mm/mmap.c:1841
 dup_mm kernel/fork.c:1530 [inline]
 copy_mm kernel/fork.c:1582 [inline]
 copy_process+0x459f/0x7800 kernel/fork.c:2223
 kernel_clone+0xfc/0x9a0 kernel/fork.c:2654
 __do_sys_clone+0xd9/0x120 kernel/fork.c:2795
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x106/0x7b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 15050 tgid 15050 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1433 [inline]
 __free_frozen_pages+0x7b1/0xfb0 mm/page_alloc.c:2978
 __pagetable_free include/linux/mm.h:3414 [inline]
 pagetable_free include/linux/mm.h:3438 [inline]
 pagetable_dtor_free include/linux/mm.h:3542 [inline]
 __tlb_remove_table include/asm-generic/tlb.h:221 [inline]
 __tlb_remove_table_free mm/mmu_gather.c:228 [inline]
 tlb_remove_table_rcu+0x2b2/0x390 mm/mmu_gather.c:291
 rcu_do_batch kernel/rcu/tree.c:2617 [inline]
 rcu_core+0x5a2/0x10d0 kernel/rcu/tree.c:2869
 handle_softirqs+0x1de/0x9d0 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xed/0x150 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+0x8f/0xb0 arch/x86/kernel/apic/apic.c:1056
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697

Memory state around the buggy address:
 ffff888142e63e80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888142e63f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888142e63f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                                ^
 ffff888142e64000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888142e64080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess):
   0:	00 e8                	add    %ch,%al
   2:	51                   	push   %rcx
   3:	5d                   	pop    %rbp
   4:	28 00                	sub    %al,(%rax)
   6:	9c                   	pushf
   7:	5d                   	pop    %rbp
   8:	81 e5 00 02 00 00    	and    $0x200,%ebp
   e:	31 ff                	xor    %edi,%edi
  10:	48 89 ee             	mov    %rbp,%rsi
  13:	e8 7f 65 20 00       	call   0x206597
  18:	48 85 ed             	test   %rbp,%rbp
  1b:	0f 85 d7 01 00 00    	jne    0x1f8
  21:	e8 91 6a 20 00       	call   0x206ab7
  26:	fb                   	sti
  27:	4c 89 e8             	mov    %r13,%rax
* 2a:	48 c1 e8 03          	shr    $0x3,%rax <-- trapping instruction
  2e:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1)
  33:	0f 85 64 03 00 00    	jne    0x39d
  39:	48 8b 0c 24          	mov    (%rsp),%rcx
  3d:	48                   	rex.W
  3e:	8b                   	.byte 0x8b
  3f:	6b                   	.byte 0x6b