==================================================================
BUG: KASAN: slab-out-of-bounds in mcp2221_raw_event+0x103c/0x10a0 drivers/hid/hid-mcp2221.c:948
Read of size 1 at addr ffff88813fb1ffff by task syz.1.1774/11165
CPU: 0 UID: 0 PID: 11165 Comm: syz.1.1774 Not tainted syzkaller #0 PREEMPT(voluntary)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
__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/0x1a0 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:1777 [inline]
__hrtimer_run_queues+0x516/0x990 kernel/time/hrtimer.c:1841
hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1858
handle_softirqs+0x1dd/0x8f0 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
RIP: 0010:debug_lockdep_rcu_enabled+0xa/0x40 kernel/rcu/update.c:320
Code: 24 04 e8 a9 fa ff ff 8b 44 24 04 eb aa 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 8b 05 2e 71 72 03 <85> c0 74 20 8b 05 e0 7c 72 03 85 c0 74 16 65 48 8b 05 78 df 70 05
RSP: 0018:ffffc900129efb48 EFLAGS: 00000246
RAX: 0000000000000002 RBX: ffff8881f56390c0 RCX: 0000000000000001
RDX: 0000000000000046 RSI: ffffffff88d3784a RDI: ffffffff878a8920
RBP: ffffc900129efc38 R08: 0000000000000000 R09: fffffbfff158bc1a
R10: ffffffff8ac5e0d7 R11: 0000000000000000 R12: ffff88810a6f1d40
R13: 0000000000000000 R14: ffffffff8cc5e0c0 R15: 0000000000000000
schedule_debug kernel/sched/core.c:5835 [inline]
__schedule+0x200/0x4040 kernel/sched/core.c:6740
__schedule_loop kernel/sched/core.c:6945 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:6960
do_nanosleep+0x206/0x560 kernel/time/hrtimer.c:2116
hrtimer_nanosleep+0x156/0x360 kernel/time/hrtimer.c:2163
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+0x336/0x480 kernel/time/posix-timers.c:1375
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xc9/0x570 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3e7875b58e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007f3e771f5f38 EFLAGS: 00000246 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 00007f3e771f76c0 RCX: 00007f3e7875b58e
RDX: 00007f3e771f5f90 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000040
R13: 0000000000000000 R14: 00007f3e78a15fa0 R15: 00007ffde7ea7218
Allocated by task 8422:
kasan_save_stack+0x30/0x50 mm/kasan/common.c:56
kasan_save_track+0x14/0x30 mm/kasan/common.c:77
unpoison_slab_object mm/kasan/common.c:339 [inline]
__kasan_slab_alloc+0x6e/0x70 mm/kasan/common.c:365
kasan_slab_alloc include/linux/kasan.h:252 [inline]
slab_post_alloc_hook mm/slub.c:4953 [inline]
slab_alloc_node mm/slub.c:5263 [inline]
kmem_cache_alloc_noprof+0x266/0x760 mm/slub.c:5270
getname_flags.part.0+0x4c/0x540 fs/namei.c:146
getname_flags fs/namei.c:3566 [inline]
user_path_at+0x9b/0x100 fs/namei.c:3566
do_utimes_path fs/utimes.c:96 [inline]
do_utimes+0xf5/0x290 fs/utimes.c:141
__do_sys_utimensat fs/utimes.c:160 [inline]
__se_sys_utimensat fs/utimes.c:144 [inline]
__x64_sys_utimensat+0x1c6/0x290 fs/utimes.c:144
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xc9/0x570 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 8422:
kasan_save_stack+0x30/0x50 mm/kasan/common.c:56
kasan_save_track+0x14/0x30 mm/kasan/common.c:77
kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:252 [inline]
__kasan_slab_free+0x43/0x70 mm/kasan/common.c:284
kasan_slab_free include/linux/kasan.h:234 [inline]
slab_free_hook mm/slub.c:2540 [inline]
slab_free mm/slub.c:6670 [inline]
kmem_cache_free+0x124/0x6d0 mm/slub.c:6781
putname+0xf5/0x1a0 fs/namei.c:297
user_path_at+0xc0/0x100 fs/namei.c:3569
do_utimes_path fs/utimes.c:96 [inline]
do_utimes+0xf5/0x290 fs/utimes.c:141
__do_sys_utimensat fs/utimes.c:160 [inline]
__se_sys_utimensat fs/utimes.c:144 [inline]
__x64_sys_utimensat+0x1c6/0x290 fs/utimes.c:144
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xc9/0x570 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88813fb1e600
which belongs to the cache names_cache of size 4096
The buggy address is located 2559 bytes to the right of
allocated 4096-byte region [ffff88813fb1e600, ffff88813fb1f600)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x13fb18
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x200000000000040(head|node=0|zone=2)
page_type: f5(slab)
raw: 0200000000000040 ffff8881012a1000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000070007 00000000f5000000 0000000000000000
head: 0200000000000040 ffff8881012a1000 dead000000000122 0000000000000000
head: 0000000000000000 0000000000070007 00000000f5000000 0000000000000000
head: 0200000000000003 ffffea0004fec601 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 8422, tgid 8422 (udevd), ts 1089819499455, free_ts 1089027154072
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1e1/0x250 mm/page_alloc.c:1846
prep_new_page mm/page_alloc.c:1854 [inline]
get_page_from_freelist+0xd57/0x3b20 mm/page_alloc.c:3915
__alloc_frozen_pages_noprof+0x269/0x2230 mm/page_alloc.c:5210
alloc_pages_mpol+0xe8/0x410 mm/mempolicy.c:2486
alloc_slab_page mm/slub.c:3075 [inline]
allocate_slab mm/slub.c:3248 [inline]
new_slab+0x2c4/0x440 mm/slub.c:3302
___slab_alloc+0xda3/0x1ca0 mm/slub.c:4656
__slab_alloc.isra.0+0x63/0x110 mm/slub.c:4779
__slab_alloc_node mm/slub.c:4855 [inline]
slab_alloc_node mm/slub.c:5251 [inline]
kmem_cache_alloc_noprof+0x4ad/0x760 mm/slub.c:5270
getname_flags.part.0+0x4c/0x540 fs/namei.c:146
getname_flags+0x93/0xf0 include/linux/audit.h:345
getname include/linux/fs.h:2498 [inline]
getname_maybe_null include/linux/fs.h:2505 [inline]
getname_maybe_null include/linux/fs.h:2502 [inline]
vfs_fstatat+0xe1/0xf0 fs/stat.c:370
__do_sys_newfstatat+0x9d/0x120 fs/stat.c:542
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xc9/0x570 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 2859 tgid 2859 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1395 [inline]
__free_frozen_pages+0x7d1/0x1010 mm/page_alloc.c:2943
discard_slab mm/slub.c:3346 [inline]
__put_partials+0x127/0x160 mm/slub.c:3886
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x47/0xe0 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x1a0/0x1f0 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x4e/0x70 mm/kasan/common.c:349
kasan_slab_alloc include/linux/kasan.h:252 [inline]
slab_post_alloc_hook mm/slub.c:4953 [inline]
slab_alloc_node mm/slub.c:5263 [inline]
kmem_cache_alloc_node_noprof+0x292/0x7d0 mm/slub.c:5315
__alloc_skb+0x156/0x410 net/core/skbuff.c:679
alloc_skb include/linux/skbuff.h:1383 [inline]
netlink_alloc_large_skb+0x69/0x150 net/netlink/af_netlink.c:1184
netlink_sendmsg+0x680/0xda0 net/netlink/af_netlink.c:1869
sock_sendmsg_nosec net/socket.c:727 [inline]
__sock_sendmsg net/socket.c:742 [inline]
____sys_sendmsg+0xa54/0xc30 net/socket.c:2592
___sys_sendmsg+0x190/0x1e0 net/socket.c:2646
__sys_sendmsg+0x170/0x220 net/socket.c:2678
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xc9/0x570 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff88813fb1fe80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88813fb1ff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88813fb1ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff88813fb20000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88813fb20080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess):
0: 24 04 and $0x4,%al
2: e8 a9 fa ff ff call 0xfffffab0
7: 8b 44 24 04 mov 0x4(%rsp),%eax
b: eb aa jmp 0xffffffb7
d: 0f 1f 00 nopl (%rax)
10: 90 nop
11: 90 nop
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: f3 0f 1e fa endbr64
24: 8b 05 2e 71 72 03 mov 0x372712e(%rip),%eax # 0x3727158
* 2a: 85 c0 test %eax,%eax <-- trapping instruction
2c: 74 20 je 0x4e
2e: 8b 05 e0 7c 72 03 mov 0x3727ce0(%rip),%eax # 0x3727d14
34: 85 c0 test %eax,%eax
36: 74 16 je 0x4e
38: 65 48 8b 05 78 df 70 mov %gs:0x570df78(%rip),%rax # 0x570dfb8
3f: 05