==================================================================
BUG: KASAN: slab-out-of-bounds in mcp2221_raw_event+0x1070/0x10a0 drivers/hid/hid-mcp2221.c:948
Read of size 1 at addr ffff88802efbffff by task syz.4.91/6296

CPU: 1 UID: 0 PID: 6296 Comm: syz.4.91 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+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+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:arch_static_branch arch/x86/include/asm/jump_label.h:36 [inline]
RIP: 0010:native_write_msr arch/x86/include/asm/msr.h:139 [inline]
RIP: 0010:wrmsrq arch/x86/include/asm/msr.h:199 [inline]
RIP: 0010:native_x2apic_icr_write arch/x86/include/asm/apic.h:233 [inline]
RIP: 0010:__x2apic_send_IPI_dest arch/x86/kernel/apic/x2apic_phys.c:113 [inline]
RIP: 0010:x2apic_send_IPI+0x9a/0xe0 arch/x86/kernel/apic/x2apic_phys.c:50
Code: 8b 13 0f ae f0 0f ae e8 b9 00 04 00 00 41 83 fc 02 44 89 e0 48 0f 44 c1 48 c1 e2 20 b9 30 08 00 00 48 09 d0 48 c1 ea 20 0f 30 <66> 90 5b 5d 41 5c e9 db f9 2d 0a 5b 31 d2 5d 48 89 c6 bf 30 08 00
RSP: 0018:ffffc90005cefa08 EFLAGS: 00000246
RAX: 00000000000000fb RBX: ffff8880b84201b4 RCX: 0000000000000830
RDX: 0000000000000000 RSI: 00000000000000fb RDI: ffffffff8df61e80
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 00000000000000fb
R13: 1ffff92000b9df47 R14: 1ffff92000b9df01 R15: 0000000000000000
 arch_send_call_function_single_ipi arch/x86/include/asm/smp.h:95 [inline]
 send_call_function_single_ipi kernel/smp.c:120 [inline]
 __smp_call_single_queue+0x28c/0x2f0 kernel/smp.c:413
 generic_exec_single+0xb4/0x390 kernel/smp.c:450
 smp_call_function_single_async+0x68/0xd0 kernel/smp.c:732
 rdmsr_safe_on_cpu+0x104/0x210 arch/x86/lib/msr-smp.c:179
 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: 0033:0x7f6a6018eba9
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:00007f6a60ff1038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f6a603d6090 RCX: 00007f6a6018eba9
RDX: 0000000000018ff8 RSI: 0000200000019680 RDI: 0000000000000008
RBP: 00007f6a60211e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6a603d6128 R14: 00007f6a603d6090 R15: 00007fff5cfe6508
 </TASK>

Allocated by task 1:
 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+0xaa/0xb0 mm/kasan/common.c:405
 kmalloc_noprof include/linux/slab.h:905 [inline]
 kzalloc_noprof include/linux/slab.h:1039 [inline]
 device_private_init drivers/base/core.c:3534 [inline]
 device_add+0xccc/0x1aa0 drivers/base/core.c:3585
 __video_register_device+0x1dd9/0x5ab0 drivers/media/v4l2-core/v4l2-dev.c:1064
 video_register_device include/media/v4l2-dev.h:390 [inline]
 vivid_create_devnodes drivers/media/test-drivers/vivid/vivid-core.c:1709 [inline]
 vivid_create_instance drivers/media/test-drivers/vivid/vivid-core.c:2042 [inline]
 vivid_probe drivers/media/test-drivers/vivid/vivid-core.c:2095 [inline]
 vivid_probe+0x9b0f/0xb890 drivers/media/test-drivers/vivid/vivid-core.c:2080
 platform_probe+0x103/0x1d0 drivers/base/platform.c:1405
 call_driver_probe drivers/base/dd.c:581 [inline]
 really_probe+0x241/0xa90 drivers/base/dd.c:659
 __driver_probe_device+0x1de/0x440 drivers/base/dd.c:801
 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:831
 __driver_attach+0x283/0x580 drivers/base/dd.c:1217
 bus_for_each_dev+0x13e/0x1d0 drivers/base/bus.c:370
 bus_add_driver+0x2e9/0x690 drivers/base/bus.c:678
 driver_register+0x15c/0x4b0 drivers/base/driver.c:249
 vivid_init+0x5eb/0x8c0 drivers/media/test-drivers/vivid/vivid-core.c:2294
 do_one_initcall+0x120/0x6e0 init/main.c:1269
 do_initcall_level init/main.c:1331 [inline]
 do_initcalls init/main.c:1347 [inline]
 do_basic_setup init/main.c:1366 [inline]
 kernel_init_freeable+0x5c2/0x910 init/main.c:1579
 kernel_init+0x1c/0x2b0 init/main.c:1469
 ret_from_fork+0x56a/0x730 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

The buggy address belongs to the object at ffff88802efbfc00
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 751 bytes to the right of
 allocated 272-byte region [ffff88802efbfc00, ffff88802efbfd10)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2efbc
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 ffff88801b841c80 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801b841c80 dead000000000122 0000000000000000
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea0000bbef01 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 10935422673, 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+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_slab_page mm/slub.c:2492 [inline]
 allocate_slab mm/slub.c:2660 [inline]
 new_slab+0x247/0x330 mm/slub.c:2714
 ___slab_alloc+0xcf2/0x1750 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]
 __do_kmalloc_node mm/slub.c:4375 [inline]
 __kvmalloc_node_noprof+0x3b1/0x620 mm/slub.c:5067
 v4l2_ctrl_new+0x97d/0x2180 drivers/media/v4l2-core/v4l2-ctrls-core.c:2031
 v4l2_ctrl_new_std+0x1be/0x290 drivers/media/v4l2-core/v4l2-ctrls-core.c:2185
 vivid_create_controls+0x19d5/0x3e10 drivers/media/test-drivers/vivid/vivid-ctrls.c:1946
 vivid_create_instance drivers/media/test-drivers/vivid/vivid-core.c:1933 [inline]
 vivid_probe drivers/media/test-drivers/vivid/vivid-core.c:2095 [inline]
 vivid_probe+0x515f/0xb890 drivers/media/test-drivers/vivid/vivid-core.c:2080
 platform_probe+0x103/0x1d0 drivers/base/platform.c:1405
 call_driver_probe drivers/base/dd.c:581 [inline]
 really_probe+0x241/0xa90 drivers/base/dd.c:659
 __driver_probe_device+0x1de/0x440 drivers/base/dd.c:801
 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:831
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88802efbfe80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88802efbff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88802efbff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                                                ^
 ffff88802efc0000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88802efc0080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess):
   0:	8b 13                	mov    (%rbx),%edx
   2:	0f ae f0             	mfence
   5:	0f ae e8             	lfence
   8:	b9 00 04 00 00       	mov    $0x400,%ecx
   d:	41 83 fc 02          	cmp    $0x2,%r12d
  11:	44 89 e0             	mov    %r12d,%eax
  14:	48 0f 44 c1          	cmove  %rcx,%rax
  18:	48 c1 e2 20          	shl    $0x20,%rdx
  1c:	b9 30 08 00 00       	mov    $0x830,%ecx
  21:	48 09 d0             	or     %rdx,%rax
  24:	48 c1 ea 20          	shr    $0x20,%rdx
  28:	0f 30                	wrmsr
* 2a:	66 90                	xchg   %ax,%ax <-- trapping instruction
  2c:	5b                   	pop    %rbx
  2d:	5d                   	pop    %rbp
  2e:	41 5c                	pop    %r12
  30:	e9 db f9 2d 0a       	jmp    0xa2dfa10
  35:	5b                   	pop    %rbx
  36:	31 d2                	xor    %edx,%edx
  38:	5d                   	pop    %rbp
  39:	48 89 c6             	mov    %rax,%rsi
  3c:	bf                   	.byte 0xbf
  3d:	30 08                	xor    %cl,(%rax)