==================================================================
BUG: KASAN: slab-out-of-bounds in mcp2221_raw_event+0x1062/0x1240 drivers/hid/hid-mcp2221.c:858
Read of size 1 at addr ffff88806ccb3fff by task kworker/0:1/9
CPU: 0 PID: 9 Comm: kworker/0:1 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: usb_hub_wq hub_event
Call Trace:
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:364 [inline]
print_report+0xa8/0x210 mm/kasan/report.c:468
kasan_report+0x117/0x150 mm/kasan/report.c:581
mcp2221_raw_event+0x1062/0x1240 drivers/hid/hid-mcp2221.c:858
hid_input_report+0x400/0x510 drivers/hid/hid-core.c:2103
hid_irq_in+0x479/0x6d0 drivers/hid/usbhid/hid-core.c:284
__usb_hcd_giveback_urb+0x35f/0x520 drivers/usb/core/hcd.c:1650
dummy_timer+0x8de/0x3320 drivers/usb/gadget/udc/dummy_hcd.c:2003
__run_hrtimer kernel/time/hrtimer.c:1754 [inline]
__hrtimer_run_queues+0x520/0xc40 kernel/time/hrtimer.c:1818
hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1835
handle_softirqs+0x280/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__sanitizer_cov_trace_pc+0x5c/0x60 kernel/kcov.c:234
Code: f8 15 00 00 83 fa 02 75 21 48 8b 91 00 16 00 00 48 8b 32 48 8d 7e 01 8b 89 fc 15 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2 08 0f 1f 00 f3 0f 1e fa 48 8b 04 24 65 48 8b 15 40 8a 7c 7e 65 8b
RSP: 0018:ffffc900000e66a8 EFLAGS: 00000287
RAX: ffffffff8a746277 RBX: ffff8881456a8000 RCX: 0000000000100000
RDX: ffffc90017968000 RSI: 00000000000dbee1 RDI: 00000000000dbee2
RBP: 0000000000000000 R08: ffffffff8e8b666f R09: 1ffffffff1d16ccd
R10: dffffc0000000000 R11: fffffbfff1d16cce R12: ffff888142f1cc80
R13: ffff88805b88cdc0 R14: 0000000000000001 R15: dffffc0000000000
uevent_net_broadcast_untagged lib/kobject_uevent.c:324 [inline]
kobject_uevent_net_broadcast+0x2c7/0x530 lib/kobject_uevent.c:409
kobject_uevent_env+0x550/0x8b0 lib/kobject_uevent.c:608
device_add+0x5e8/0xc50 drivers/base/core.c:3666
cdev_device_add+0x1d6/0x390 fs/char_dev.c:556
i2cdev_attach_adapter+0x2eb/0x4d0 drivers/i2c/i2c-dev.c:676
notifier_call_chain+0x197/0x380 kernel/notifier.c:93
blocking_notifier_call_chain+0x6a/0x90 kernel/notifier.c:388
bus_notify+0x13e/0x180 drivers/base/bus.c:1039
device_add+0x5de/0xc50 drivers/base/core.c:3665
i2c_register_adapter+0x372/0xfb0 drivers/i2c/i2c-core-base.c:1551
devm_i2c_add_adapter+0x1b/0x80 drivers/i2c/i2c-core-base.c:1842
mcp2221_probe+0x300/0x760 drivers/hid/hid-mcp2221.c:1198
__hid_device_probe drivers/hid/hid-core.c:2652 [inline]
hid_device_probe+0x293/0x5b0 drivers/hid/hid-core.c:2689
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x25b/0xb20 drivers/base/dd.c:718
__driver_probe_device+0x1ef/0x390 drivers/base/dd.c:880
driver_probe_device+0x4f/0x420 drivers/base/dd.c:910
__device_attach_driver+0x2ca/0x510 drivers/base/dd.c:1038
bus_for_each_drv+0x252/0x2e0 drivers/base/bus.c:459
__device_attach+0x2c2/0x420 drivers/base/dd.c:1110
bus_probe_device+0x180/0x260 drivers/base/bus.c:573
device_add+0x88e/0xc50 drivers/base/core.c:3700
hid_add_device+0x38d/0x530 drivers/hid/hid-core.c:2835
usbhid_probe+0xe02/0x1220 drivers/hid/usbhid/hid-core.c:1447
usb_probe_interface+0x5c9/0xb20 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x25b/0xb20 drivers/base/dd.c:718
__driver_probe_device+0x1ef/0x390 drivers/base/dd.c:880
driver_probe_device+0x4f/0x420 drivers/base/dd.c:910
__device_attach_driver+0x2ca/0x510 drivers/base/dd.c:1038
bus_for_each_drv+0x252/0x2e0 drivers/base/bus.c:459
__device_attach+0x2c2/0x420 drivers/base/dd.c:1110
bus_probe_device+0x180/0x260 drivers/base/bus.c:573
device_add+0x88e/0xc50 drivers/base/core.c:3700
usb_set_configuration+0x1a79/0x20c0 drivers/usb/core/message.c:2265
usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:238
usb_probe_device+0x13d/0x270 drivers/usb/core/driver.c:293
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x25b/0xb20 drivers/base/dd.c:718
__driver_probe_device+0x1ef/0x390 drivers/base/dd.c:880
driver_probe_device+0x4f/0x420 drivers/base/dd.c:910
__device_attach_driver+0x2ca/0x510 drivers/base/dd.c:1038
bus_for_each_drv+0x252/0x2e0 drivers/base/bus.c:459
__device_attach+0x2c2/0x420 drivers/base/dd.c:1110
bus_probe_device+0x180/0x260 drivers/base/bus.c:573
device_add+0x88e/0xc50 drivers/base/core.c:3700
usb_new_device+0xa3c/0x1660 drivers/usb/core/hub.c:2660
hub_port_connect drivers/usb/core/hub.c:5529 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5669 [inline]
port_event drivers/usb/core/hub.c:5833 [inline]
hub_event+0x29bf/0x49f0 drivers/usb/core/hub.c:5915
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
The buggy address belongs to the object at ffff88806ccb3e00
which belongs to the cache maple_node of size 256
The buggy address is located 255 bytes to the right of
allocated 256-byte region [ffff88806ccb3e00, ffff88806ccb3f00)
The buggy address belongs to the physical page:
page:ffffea0001b32c80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x6ccb2
head:ffffea0001b32c80 order:1 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff888018645000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0x152800(GFP_NOWAIT|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 5789, tgid 5789 (udevd), ts 82390619126, free_ts 81063210572
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1581
prep_new_page mm/page_alloc.c:1588 [inline]
get_page_from_freelist+0x1951/0x19e0 mm/page_alloc.c:3220
__alloc_pages+0x1f0/0x460 mm/page_alloc.c:4500
alloc_slab_page+0x5d/0x160 mm/slub.c:1881
allocate_slab mm/slub.c:2028 [inline]
new_slab+0x87/0x2d0 mm/slub.c:2081
___slab_alloc+0xc5d/0x12f0 mm/slub.c:3253
__slab_alloc mm/slub.c:3339 [inline]
__slab_alloc_node mm/slub.c:3392 [inline]
slab_alloc_node mm/slub.c:3485 [inline]
slab_alloc mm/slub.c:3503 [inline]
__kmem_cache_alloc_lru mm/slub.c:3510 [inline]
kmem_cache_alloc+0x1b3/0x2d0 mm/slub.c:3519
mt_alloc_one lib/maple_tree.c:162 [inline]
mas_alloc_nodes+0x2f8/0x8c0 lib/maple_tree.c:1267
mas_node_count_gfp lib/maple_tree.c:1347 [inline]
mas_node_count lib/maple_tree.c:1361 [inline]
mas_wr_node_store lib/maple_tree.c:3945 [inline]
mas_wr_modify+0x1284/0x2a10 lib/maple_tree.c:4231
mas_store_gfp+0x27c/0x390 lib/maple_tree.c:5440
vma_iter_clear_gfp mm/internal.h:1164 [inline]
do_vmi_align_munmap+0xdc7/0x16d0 mm/mmap.c:2572
do_vmi_munmap+0x252/0x2d0 mm/mmap.c:2660
__vm_munmap+0x1a2/0x3c0 mm/mmap.c:2961
__do_sys_munmap mm/mmap.c:2978 [inline]
__se_sys_munmap mm/mmap.c:2975 [inline]
__x64_sys_munmap+0x60/0x70 mm/mmap.c:2975
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1181 [inline]
free_unref_page_prepare+0x7b2/0x8c0 mm/page_alloc.c:2365
free_unref_page+0x32/0x2e0 mm/page_alloc.c:2458
__slab_free+0x35a/0x400 mm/slub.c:3736
qlink_free mm/kasan/quarantine.c:166 [inline]
qlist_free_all+0x75/0xd0 mm/kasan/quarantine.c:185
kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:306
kasan_slab_alloc include/linux/kasan.h:188 [inline]
slab_post_alloc_hook+0x6e/0x4b0 mm/slab.h:767
slab_alloc_node mm/slub.c:3495 [inline]
__kmem_cache_alloc_node+0x13a/0x250 mm/slub.c:3534
kmalloc_trace+0x2a/0xe0 mm/slab_common.c:1098
kmalloc include/linux/slab.h:600 [inline]
netdev_name_node_alloc net/core/dev.c:259 [inline]
netdev_name_node_head_alloc net/core/dev.c:273 [inline]
register_netdevice+0x573/0x1bb0 net/core/dev.c:10239
veth_newlink+0x7f4/0xc30 drivers/net/veth.c:1906
rtnl_newlink_create net/core/rtnetlink.c:3521 [inline]
__rtnl_newlink net/core/rtnetlink.c:3741 [inline]
rtnl_newlink+0x1542/0x20a0 net/core/rtnetlink.c:3754
rtnetlink_rcv_msg+0x869/0xfa0 net/core/rtnetlink.c:6476
netlink_rcv_skb+0x241/0x4d0 net/netlink/af_netlink.c:2545
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x751/0x8d0 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x8d0/0xbf0 net/netlink/af_netlink.c:1894
Memory state around the buggy address:
ffff88806ccb3e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88806ccb3f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88806ccb3f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff88806ccb4000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88806ccb4080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess):
0: f8 clc
1: 15 00 00 83 fa adc $0xfa830000,%eax
6: 02 75 21 add 0x21(%rbp),%dh
9: 48 8b 91 00 16 00 00 mov 0x1600(%rcx),%rdx
10: 48 8b 32 mov (%rdx),%rsi
13: 48 8d 7e 01 lea 0x1(%rsi),%rdi
17: 8b 89 fc 15 00 00 mov 0x15fc(%rcx),%ecx
1d: 48 39 cf cmp %rcx,%rdi
20: 73 08 jae 0x2a
22: 48 89 3a mov %rdi,(%rdx)
25: 48 89 44 f2 08 mov %rax,0x8(%rdx,%rsi,8)
* 2a: c3 ret <-- trapping instruction
2b: 0f 1f 00 nopl (%rax)
2e: f3 0f 1e fa endbr64
32: 48 8b 04 24 mov (%rsp),%rax
36: 65 48 8b 15 40 8a 7c mov %gs:0x7e7c8a40(%rip),%rdx # 0x7e7c8a7e
3d: 7e
3e: 65 gs
3f: 8b .byte 0x8b