==================================================================
BUG: KASAN: slab-out-of-bounds in mcp2221_raw_event+0x1070/0x10a0 drivers/hid/hid-mcp2221.c:948
Read of size 1 at addr ffff88810d303fff by task syz.9.4037/24160

CPU: 1 UID: 0 PID: 24160 Comm: syz.9.4037 Not tainted syzkaller #0 PREEMPT(voluntary) 
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+0x38b/0x610 drivers/usb/core/hcd.c:1661
 usb_hcd_giveback_urb+0x39b/0x450 drivers/usb/core/hcd.c:1745
 dummy_timer+0x1809/0x3a00 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+0x208/0x8d0 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0xfa/0x160 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+0x90/0xb0 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:lock_release+0x183/0x2f0 kernel/locking/lockdep.c:5893
Code: 0f c1 05 28 8a 38 0b 83 f8 01 0f 85 1d 01 00 00 9c 58 f6 c4 02 0f 85 08 01 00 00 41 f7 c5 00 02 00 00 74 01 fb 48 8b 44 24 10 <65> 48 2b 05 7d 4a 38 0b 0f 85 58 01 00 00 48 83 c4 18 5b 41 5c 41
RSP: 0018:ffffc90012bffa98 EFLAGS: 00000206
RAX: 14e3f6e865668400 RBX: ffffffff8919e000 RCX: ffffc90012bffaa4
RDX: 0000000000000000 RSI: ffffffff88d07f66 RDI: ffffffff878966e0
RBP: ffff88810569d700 R08: 54bb54405b3d45ab R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff873f1317
R13: 0000000000000287 R14: ffff88810569d700 R15: 0000000000000001
 sched_submit_work kernel/sched/core.c:7024 [inline]
 schedule+0x2dc/0x3a0 kernel/sched/core.c:7057
 futex_do_wait+0x88/0x180 kernel/futex/waitwake.c:358
 __futex_wait+0x1b9/0x2f0 kernel/futex/waitwake.c:687
 futex_wait+0xe8/0x380 kernel/futex/waitwake.c:715
 do_futex+0x229/0x350 kernel/futex/syscalls.c:102
 __do_sys_futex kernel/futex/syscalls.c:179 [inline]
 __se_sys_futex kernel/futex/syscalls.c:160 [inline]
 __x64_sys_futex+0x1e0/0x4c0 kernel/futex/syscalls.c:160
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4d0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1a0eabec29
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:00007fff279a3018 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00000000001f6c8a RCX: 00007f1a0eabec29
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f1a0ed05fac
RBP: 000000000000015e R08: 00007f1a0f842000 R09: 00000006279a330f
R10: 00007fff279a3110 R11: 0000000000000246 R12: 00007f1a0ed05fac
R13: 00007fff279a3110 R14: 00000000001f6de8 R15: 00007fff279a3130
 </TASK>

Allocated by task 2862:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:388 [inline]
 __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:405
 kasan_kmalloc include/linux/kasan.h:260 [inline]
 __do_kmalloc_node mm/slub.c:4376 [inline]
 __kmalloc_node_track_caller_noprof+0x212/0x4c0 mm/slub.c:4395
 kmemdup_noprof+0x29/0x60 mm/util.c:138
 kmemdup_noprof include/linux/fortify-string.h:765 [inline]
 shmem_symlink+0x249/0x780 mm/shmem.c:4174
 vfs_symlink fs/namei.c:4730 [inline]
 vfs_symlink+0x400/0x680 fs/namei.c:4714
 do_symlinkat+0x16d/0x2e0 fs/namei.c:4756
 __do_sys_symlink fs/namei.c:4777 [inline]
 __se_sys_symlink fs/namei.c:4775 [inline]
 __x64_sys_symlink+0x75/0x90 fs/namei.c:4775
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4d0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88810d303fc0
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 44 bytes to the right of
 allocated 19-byte region [ffff88810d303fc0, ffff88810d303fd3)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88810d303680 pfn:0x10d303
flags: 0x200000000000200(workingset|node=0|zone=2)
page_type: f5(slab)
raw: 0200000000000200 ffff888100041780 ffffea0004f91890 ffffea0004c87610
raw: ffff88810d303680 000000000040003f 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 0x52800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP), pid 912, tgid 912 (kworker/u8:4), ts 7559554685, free_ts 0
 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+0xf98/0x2ce0 mm/page_alloc.c:3858
 __alloc_frozen_pages_noprof+0x259/0x21e0 mm/page_alloc.c:5148
 alloc_pages_mpol+0xe4/0x410 mm/mempolicy.c:2416
 alloc_slab_page mm/slub.c:2492 [inline]
 allocate_slab mm/slub.c:2660 [inline]
 new_slab+0x247/0x330 mm/slub.c:2714
 ___slab_alloc+0xc55/0x1620 mm/slub.c:3901
 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3992
 __slab_alloc_node mm/slub.c:4067 [inline]
 slab_alloc_node mm/slub.c:4228 [inline]
 __kmalloc_cache_noprof+0x209/0x3c0 mm/slub.c:4402
 kmalloc_noprof include/linux/slab.h:905 [inline]
 slab_free_hook mm/slub.c:2374 [inline]
 slab_free mm/slub.c:4695 [inline]
 kmem_cache_free+0x123/0x470 mm/slub.c:4797
 __cleanup_sighand kernel/fork.c:1632 [inline]
 __cleanup_sighand+0x73/0xa0 kernel/fork.c:1624
 __exit_signal kernel/exit.c:218 [inline]
 release_task+0xd07/0x1ca0 kernel/exit.c:267
 exit_notify kernel/exit.c:778 [inline]
 do_exit+0x12c1/0x2bf0 kernel/exit.c:973
 call_usermodehelper_exec_async+0x379/0x4c0 kernel/umh.c:122
 ret_from_fork+0x56d/0x700 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88810d303e80: 00 00 00 00 fc fc fc fc fa fb fb fb fc fc fc fc
 ffff88810d303f00: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
>ffff88810d303f80: fa fb fb fb fc fc fc fc 00 00 03 fc fc fc fc fc
                                                                ^
 ffff88810d304000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88810d304080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess):
   0:	0f c1 05 28 8a 38 0b 	xadd   %eax,0xb388a28(%rip)        # 0xb388a2f
   7:	83 f8 01             	cmp    $0x1,%eax
   a:	0f 85 1d 01 00 00    	jne    0x12d
  10:	9c                   	pushf
  11:	58                   	pop    %rax
  12:	f6 c4 02             	test   $0x2,%ah
  15:	0f 85 08 01 00 00    	jne    0x123
  1b:	41 f7 c5 00 02 00 00 	test   $0x200,%r13d
  22:	74 01                	je     0x25
  24:	fb                   	sti
  25:	48 8b 44 24 10       	mov    0x10(%rsp),%rax
* 2a:	65 48 2b 05 7d 4a 38 	sub    %gs:0xb384a7d(%rip),%rax        # 0xb384aaf <-- trapping instruction
  31:	0b
  32:	0f 85 58 01 00 00    	jne    0x190
  38:	48 83 c4 18          	add    $0x18,%rsp
  3c:	5b                   	pop    %rbx
  3d:	41 5c                	pop    %r12
  3f:	41                   	rex.B