==================================================================
BUG: KASAN: slab-out-of-bounds in mcp2221_raw_event+0x103c/0x10a0 drivers/hid/hid-mcp2221.c:948
Read of size 1 at addr ffff88811eabbfff by task kworker/0:5/8102
CPU: 0 UID: 0 PID: 8102 Comm: kworker/0:5 Not tainted syzkaller #0 PREEMPT(voluntary)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: usb_hub_wq hub_event
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:lockdep_enabled kernel/locking/lockdep.c:118 [inline]
RIP: 0010:lock_acquire kernel/locking/lockdep.c:5844 [inline]
RIP: 0010:lock_acquire+0xf5/0x330 kernel/locking/lockdep.c:5825
Code: df fe ff 5f 41 58 65 ff 0d d8 33 3d 0b 0f 85 54 ff ff ff 0f 1f 44 00 00 e9 4a ff ff ff 48 8b 74 24 68 48 89 ef e8 3b da 84 00 <8b> 0d f9 b3 3e 09 85 c9 0f 84 bd 00 00 00 65 8b 05 5e 77 3d 0b 85
RSP: 0000:ffffc900130fe300 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000002
RDX: 0000000000000000 RSI: ffffffff816f2891 RDI: fffffbfff129b474
RBP: ffffffff894da3a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000200 R11: 0000000000064a0d R12: 0000000000000002
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:867 [inline]
class_rcu_constructor include/linux/rcupdate.h:1195 [inline]
unwind_next_frame+0xd1/0x1ea0 arch/x86/kernel/unwind_orc.c:495
arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
unpoison_slab_object mm/kasan/common.c:340 [inline]
__kasan_slab_alloc+0x6e/0x70 mm/kasan/common.c:366
kasan_slab_alloc include/linux/kasan.h:253 [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
skb_clone+0x190/0x400 net/core/skbuff.c:2087
do_one_broadcast net/netlink/af_netlink.c:1455 [inline]
netlink_broadcast_filtered+0xb6a/0xf50 net/netlink/af_netlink.c:1533
netlink_broadcast+0x39/0x50 net/netlink/af_netlink.c:1557
uevent_net_broadcast_untagged lib/kobject_uevent.c:331 [inline]
kobject_uevent_net_broadcast lib/kobject_uevent.c:410 [inline]
kobject_uevent_env+0xcdd/0x18b0 lib/kobject_uevent.c:608
device_add+0x116e/0x1950 drivers/base/core.c:3670
i2c_register_adapter+0x39e/0x1240 drivers/i2c/i2c-core-base.c:1573
i2c_add_adapter drivers/i2c/i2c-core-base.c:1673 [inline]
i2c_add_adapter+0x10a/0x1a0 drivers/i2c/i2c-core-base.c:1653
devm_i2c_add_adapter+0x1b/0x90 drivers/i2c/i2c-core-base.c:1845
mcp2221_probe.cold+0x5de/0xab3 drivers/hid/hid-mcp2221.c:1289
__hid_device_probe drivers/hid/hid-core.c:2775 [inline]
hid_device_probe+0x50e/0x800 drivers/hid/hid-core.c:2812
call_driver_probe drivers/base/dd.c:581 [inline]
really_probe+0x241/0xa60 drivers/base/dd.c:659
__driver_probe_device+0x1de/0x400 drivers/base/dd.c:801
driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:831
__device_attach_driver+0x1df/0x340 drivers/base/dd.c:959
bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500
__device_attach+0x1e4/0x4d0 drivers/base/dd.c:1031
device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1086
bus_probe_device+0x64/0x160 drivers/base/bus.c:574
device_add+0x11d9/0x1950 drivers/base/core.c:3689
hid_add_device+0x2bf/0x440 drivers/hid/hid-core.c:2951
usbhid_probe+0xd57/0x1350 drivers/hid/usbhid/hid-core.c:1450
usb_probe_interface+0x303/0x8f0 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:581 [inline]
really_probe+0x241/0xa60 drivers/base/dd.c:659
__driver_probe_device+0x1de/0x400 drivers/base/dd.c:801
driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:831
__device_attach_driver+0x1df/0x340 drivers/base/dd.c:959
bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500
__device_attach+0x1e4/0x4d0 drivers/base/dd.c:1031
device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1086
bus_probe_device+0x64/0x160 drivers/base/bus.c:574
device_add+0x11d9/0x1950 drivers/base/core.c:3689
usb_set_configuration+0xd97/0x1c60 drivers/usb/core/message.c:2210
usb_generic_driver_probe+0xa1/0xe0 drivers/usb/core/generic.c:250
usb_probe_device+0xef/0x400 drivers/usb/core/driver.c:291
call_driver_probe drivers/base/dd.c:581 [inline]
really_probe+0x241/0xa60 drivers/base/dd.c:659
__driver_probe_device+0x1de/0x400 drivers/base/dd.c:801
driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:831
__device_attach_driver+0x1df/0x340 drivers/base/dd.c:959
bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500
__device_attach+0x1e4/0x4d0 drivers/base/dd.c:1031
device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1086
bus_probe_device+0x64/0x160 drivers/base/bus.c:574
device_add+0x11d9/0x1950 drivers/base/core.c:3689
usb_new_device.cold+0x685/0x115c drivers/usb/core/hub.c:2695
hub_port_connect drivers/usb/core/hub.c:5567 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
port_event drivers/usb/core/hub.c:5871 [inline]
hub_event+0x314d/0x4af0 drivers/usb/core/hub.c:5953
process_one_work+0x9c2/0x1840 kernel/workqueue.c:3257
process_scheduled_works kernel/workqueue.c:3340 [inline]
worker_thread+0x5da/0xe40 kernel/workqueue.c:3421
kthread+0x3b3/0x730 kernel/kthread.c:463
ret_from_fork+0x6c3/0xa20 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
Allocated by task 2862:
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
unpoison_slab_object mm/kasan/common.c:340 [inline]
__kasan_slab_alloc+0x6e/0x70 mm/kasan/common.c:366
kasan_slab_alloc include/linux/kasan.h:253 [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
Freed by task 7631:
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x43/0x70 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [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
kfree_skbmem+0x19a/0x210 net/core/skbuff.c:1130
__kfree_skb net/core/skbuff.c:1197 [inline]
consume_skb net/core/skbuff.c:1428 [inline]
consume_skb+0xd1/0x110 net/core/skbuff.c:1422
netlink_recvmsg+0x51b/0x9c0 net/netlink/af_netlink.c:1972
sock_recvmsg_nosec net/socket.c:1078 [inline]
sock_recvmsg+0x1f9/0x250 net/socket.c:1100
____sys_recvmsg+0x218/0x6b0 net/socket.c:2812
___sys_recvmsg+0x16a/0x1a0 net/socket.c:2854
__sys_recvmsg+0x16d/0x220 net/socket.c:2887
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 ffff88811eabbdc0
which belongs to the cache skbuff_head_cache of size 232
The buggy address is located 343 bytes to the right of
allocated 232-byte region [ffff88811eabbdc0, ffff88811eabbea8)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11eabb
anon flags: 0x200000000000000(node=0|zone=2)
page_type: f5(slab)
raw: 0200000000000000 ffff8881026bca00 0000000000000000 dead000000000001
raw: 0000000000000000 00000000000c000c 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 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 10231, tgid 10230 (syz.0.1374), ts 725642988033, free_ts 725632348263
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1e1/0x250 mm/page_alloc.c:1884
prep_new_page mm/page_alloc.c:1892 [inline]
get_page_from_freelist+0xd57/0x3b20 mm/page_alloc.c:3945
__alloc_frozen_pages_noprof+0x269/0x2230 mm/page_alloc.c:5240
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
skb_clone+0x190/0x400 net/core/skbuff.c:2087
do_one_broadcast net/netlink/af_netlink.c:1455 [inline]
netlink_broadcast_filtered+0xb6a/0xf50 net/netlink/af_netlink.c:1533
netlink_broadcast+0x39/0x50 net/netlink/af_netlink.c:1557
uevent_net_broadcast_untagged lib/kobject_uevent.c:331 [inline]
kobject_uevent_net_broadcast lib/kobject_uevent.c:410 [inline]
kobject_uevent_env+0xcdd/0x18b0 lib/kobject_uevent.c:608
driver_register+0x29c/0x360 drivers/base/driver.c:257
usb_gadget_register_driver_owner+0x132/0x210 drivers/usb/gadget/udc/core.c:1719
raw_ioctl_run drivers/usb/gadget/legacy/raw_gadget.c:596 [inline]
raw_ioctl+0x1a85/0x2b80 drivers/usb/gadget/legacy/raw_gadget.c:1307
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
page last free pid 10230 tgid 10230 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1433 [inline]
__free_frozen_pages+0x7d1/0x1010 mm/page_alloc.c:2973
__kasan_populate_vmalloc_do mm/kasan/shadow.c:393 [inline]
__kasan_populate_vmalloc+0x1ea/0x210 mm/kasan/shadow.c:424
kasan_populate_vmalloc include/linux/kasan.h:580 [inline]
alloc_vmap_area+0x935/0x2a00 mm/vmalloc.c:2124
__get_vm_area_node+0x1ca/0x330 mm/vmalloc.c:3219
__vmalloc_node_range_noprof+0x213/0x1530 mm/vmalloc.c:4011
__vmalloc_node_noprof+0xad/0xf0 mm/vmalloc.c:4111
alloc_thread_stack_node kernel/fork.c:354 [inline]
dup_task_struct kernel/fork.c:923 [inline]
copy_process+0x5ec/0x77a0 kernel/fork.c:2052
kernel_clone+0xfc/0x930 kernel/fork.c:2651
__do_sys_clone3+0x214/0x290 kernel/fork.c:2953
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:
ffff88811eabbe80: fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc
ffff88811eabbf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88811eabbf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff88811eabc000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88811eabc080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess), 2 bytes skipped:
0: ff 5f 41 lcall *0x41(%rdi)
3: 58 pop %rax
4: 65 ff 0d d8 33 3d 0b decl %gs:0xb3d33d8(%rip) # 0xb3d33e3
b: 0f 85 54 ff ff ff jne 0xffffff65
11: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
16: e9 4a ff ff ff jmp 0xffffff65
1b: 48 8b 74 24 68 mov 0x68(%rsp),%rsi
20: 48 89 ef mov %rbp,%rdi
23: e8 3b da 84 00 call 0x84da63
* 28: 8b 0d f9 b3 3e 09 mov 0x93eb3f9(%rip),%ecx # 0x93eb427 <-- trapping instruction
2e: 85 c9 test %ecx,%ecx
30: 0f 84 bd 00 00 00 je 0xf3
36: 65 8b 05 5e 77 3d 0b mov %gs:0xb3d775e(%rip),%eax # 0xb3d779b
3d: 85 .byte 0x85