==================================================================
BUG: KASAN: slab-out-of-bounds in mcp2221_raw_event+0x1070/0x10a0 drivers/hid/hid-mcp2221.c:948
Read of size 1 at addr ffff888125047fff by task syz.6.4487/32227
CPU: 1 UID: 0 PID: 32227 Comm: syz.6.4487 Not tainted syzkaller #0 PREEMPT(voluntary)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
__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:2139
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:1777 [inline]
__hrtimer_run_queues+0x1ff/0xad0 kernel/time/hrtimer.c:1841
hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1858
handle_softirqs+0x205/0x8d0 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0xfa/0x160 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1052
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:get_current arch/x86/include/asm/current.h:25 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:216
Code: e9 7d df 57 00 be 03 00 00 00 5b e9 02 a4 0b 01 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 34 24 <65> 48 8b 15 a8 6a 19 0b 65 8b 05 b9 6a 19 0b a9 00 01 ff 00 74 1d
RSP: 0018:ffffc900096ffd18 EFLAGS: 00000283
RAX: 00000000000000e9 RBX: 0000000000000001 RCX: ffffc900029ad000
RDX: 0000000000080000 RSI: ffffffff816b11fe RDI: ffffc900096ffd78
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff8aa0cfd7 R11: 0000000000000000 R12: ffffc900096ffd78
R13: 0000000000000001 R14: 000000000bebc200 R15: dffffc0000000000
trace_hrtimer_setup+0x1e/0x220 include/trace/events/timer.h:193
debug_setup_on_stack kernel/time/hrtimer.c:471 [inline]
hrtimer_setup_sleeper_on_stack kernel/time/hrtimer.c:2083 [inline]
hrtimer_nanosleep+0xae/0x380 kernel/time/hrtimer.c:2161
common_nsleep+0xa1/0xd0 kernel/time/posix-timers.c:1352
__do_sys_clock_nanosleep kernel/time/posix-timers.c:1398 [inline]
__se_sys_clock_nanosleep kernel/time/posix-timers.c:1375 [inline]
__x64_sys_clock_nanosleep+0x34d/0x4a0 kernel/time/posix-timers.c:1375
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: 0033:0x7fdb259c1785
Code: 24 0c 89 3c 24 48 89 4c 24 18 e8 f6 54 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 8b 74 24 0c 8b 3c 24 b8 e6 00 00 00 0f 05 <44> 89 c7 48 89 04 24 e8 4f 55 ff ff 48 8b 04 24 48 83 c4 28 f7 d8
RSP: 002b:00007fdb243edf60 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fdb259c1785
RDX: 00007fdb243edfa0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000200000000040
R13: 0000000000000000 R14: 00007fdb25be5fa0 R15: 00007ffd6e79e408
Allocated by task 26080:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
kasan_save_track+0x14/0x30 mm/kasan/common.c:77
unpoison_slab_object mm/kasan/common.c:342 [inline]
__kasan_slab_alloc+0x6e/0x70 mm/kasan/common.c:368
kasan_slab_alloc include/linux/kasan.h:252 [inline]
slab_post_alloc_hook mm/slub.c:4947 [inline]
slab_alloc_node mm/slub.c:5246 [inline]
kmem_cache_alloc_noprof+0x260/0x6c0 mm/slub.c:5253
vm_area_dup+0x25/0x6c0 mm/vma_init.c:123
dup_mmap+0x847/0x2040 mm/mmap.c:1780
dup_mm kernel/fork.c:1489 [inline]
copy_mm kernel/fork.c:1541 [inline]
copy_process+0x707a/0x75a0 kernel/fork.c:2181
kernel_clone+0xfc/0x930 kernel/fork.c:2609
__do_sys_clone+0xce/0x120 kernel/fork.c:2750
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 ffff888125047dc0
which belongs to the cache vm_area_struct of size 256
The buggy address is located 319 bytes to the right of
allocated 256-byte region [ffff888125047dc0, ffff888125047ec0)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x125047
memcg:ffff88812c2fda01
flags: 0x200000000000000(node=0|zone=2)
page_type: f5(slab)
raw: 0200000000000000 ffff8881012a1b40 dead000000000122 0000000000000000
raw: 0000000000000000 00000000000c000c 00000000f5000000 ffff88812c2fda01
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 32210, tgid 32210 (fido_id), ts 2595299401013, free_ts 2587229152339
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1850
prep_new_page mm/page_alloc.c:1858 [inline]
get_page_from_freelist+0x1003/0x2dc0 mm/page_alloc.c:3884
__alloc_frozen_pages_noprof+0x259/0x21f0 mm/page_alloc.c:5183
alloc_pages_mpol+0xe4/0x410 mm/mempolicy.c:2416
alloc_slab_page mm/slub.c:3031 [inline]
allocate_slab mm/slub.c:3204 [inline]
new_slab+0x24a/0x360 mm/slub.c:3258
___slab_alloc+0xd73/0x1a70 mm/slub.c:4628
__kmem_cache_alloc_bulk+0x1fb/0x6d0 mm/slub.c:7338
refill_sheaf mm/slub.c:2609 [inline]
alloc_full_sheaf mm/slub.c:2630 [inline]
__pcs_replace_empty_main+0x2aa/0x430 mm/slub.c:5023
alloc_from_pcs mm/slub.c:5111 [inline]
slab_alloc_node mm/slub.c:5231 [inline]
kmem_cache_alloc_noprof+0x554/0x6c0 mm/slub.c:5253
vm_area_alloc+0x1f/0x160 mm/vma_init.c:32
do_brk_flags+0x296/0x13a0 mm/vma.c:2802
__do_sys_brk+0x6ba/0xa50 mm/mmap.c:194
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
page last free pid 28697 tgid 28697 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1394 [inline]
__free_frozen_pages+0x78f/0x1000 mm/page_alloc.c:2906
vfree+0x1fd/0xb50 mm/vmalloc.c:3440
delayed_vfree_work+0x56/0x70 mm/vmalloc.c:3359
process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3263
process_scheduled_works kernel/workqueue.c:3346 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3427
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x56a/0x700 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Memory state around the buggy address:
ffff888125047e80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
ffff888125047f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888125047f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff888125048000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff888125048080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess):
0: e9 7d df 57 00 jmp 0x57df82
5: be 03 00 00 00 mov $0x3,%esi
a: 5b pop %rbx
b: e9 02 a4 0b 01 jmp 0x10ba412
10: 66 90 xchg %ax,%ax
12: 90 nop
13: 90 nop
14: 90 nop
15: 90 nop
16: 90 nop
17: 90 nop
18: 90 nop
19: 90 nop
1a: 90 nop
1b: 90 nop
1c: 90 nop
1d: 90 nop
1e: 90 nop
1f: 90 nop
20: 90 nop
21: 90 nop
22: f3 0f 1e fa endbr64
26: 48 8b 34 24 mov (%rsp),%rsi
* 2a: 65 48 8b 15 a8 6a 19 mov %gs:0xb196aa8(%rip),%rdx # 0xb196ada <-- trapping instruction
31: 0b
32: 65 8b 05 b9 6a 19 0b mov %gs:0xb196ab9(%rip),%eax # 0xb196af2
39: a9 00 01 ff 00 test $0xff0100,%eax
3e: 74 1d je 0x5d