==================================================================
BUG: KASAN: use-after-free in mcp2221_raw_event+0x1062/0x1240 drivers/hid/hid-mcp2221.c:858
Read of size 1 at addr ffff8880659c3fff by task kworker/1:8/8227
CPU: 1 PID: 8227 Comm: kworker/1:8 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
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:finish_task_switch+0x26a/0x8f0 kernel/sched/core.c:5255
Code: 0f 84 33 01 00 00 48 85 db 0f 85 52 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 e0 94 34 09 e8 1b 2f 30 00 fb 4c 8b 65 c0 <49> 8d bc 24 f8 15 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc900036e6218 EFLAGS: 00000286
RAX: 6e3333a87532c300 RBX: 0000000000000000 RCX: 6e3333a87532c300
RDX: dffffc0000000000 RSI: ffffffff8acacbe0 RDI: ffffffff8b1c9c20
RBP: ffffc900036e6270 R08: ffffffff911cd577 R09: 1ffffffff2239aae
R10: dffffc0000000000 R11: fffffbfff2239aaf R12: ffff88807d8e3c00
R13: dffffc0000000000 R14: ffff88802bf65a00 R15: ffff8880b8f3cb48
context_switch kernel/sched/core.c:5384 [inline]
__schedule+0x155b/0x45a0 kernel/sched/core.c:6700
preempt_schedule_irq+0xbf/0x150 kernel/sched/core.c:7010
irqentry_exit+0x67/0x70 kernel/entry/common.c:438
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:lock_is_held_type+0x13e/0x190 kernel/locking/lockdep.c:5830
Code: 75 40 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 46 41 f7 c5 00 02 00 00 74 01 fb 65 48 8b 04 25 28 00 00 00 <48> 3b 44 24 08 75 3c 89 e8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffffc900036e6618 EFLAGS: 00000206
RAX: 6e3333a87532c300 RBX: ffff88807d8e3c00 RCX: 6e3333a87532c300
RDX: 0000000000000000 RSI: ffffffff8acadd60 RDI: ffffffff8b1c9c20
RBP: 0000000000000000 R08: ffffffff8e8b666f R09: 1ffffffff1d16ccd
R10: dffffc0000000000 R11: fffffbfff1d16cce R12: 0000000000000006
R13: 0000000000000246 R14: ffffffff8d1321c0 R15: ffff88807d8e47d0
lock_is_held include/linux/lockdep.h:288 [inline]
__might_resched+0x9f/0x630 kernel/sched/core.c:10173
might_alloc include/linux/sched/mm.h:306 [inline]
slab_pre_alloc_hook+0x4a/0x310 mm/slab.h:714
slab_alloc_node mm/slub.c:3477 [inline]
__kmem_cache_alloc_node+0x53/0x250 mm/slub.c:3534
__do_kmalloc_node mm/slab_common.c:1006 [inline]
__kmalloc+0xa4/0x230 mm/slab_common.c:1020
kmalloc include/linux/slab.h:604 [inline]
kzalloc include/linux/slab.h:721 [inline]
kobject_get_path+0xc3/0x2c0 lib/kobject.c:161
kobject_uevent_env+0x28a/0x8b0 lib/kobject_uevent.c:544
device_add+0x5e8/0xc50 drivers/base/core.c:3666
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 physical page:
page:ffffea00019670c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x659c3
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000000 dead000000000100 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x100cc0(GFP_USER), pid 9236, tgid 9234 (syz.3.828), ts 273118756027, free_ts 322296669751
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
__get_free_pages+0xc/0x30 mm/page_alloc.c:4547
kasan_populate_vmalloc_pte+0x35/0x100 mm/kasan/shadow.c:323
apply_to_pte_range mm/memory.c:2604 [inline]
apply_to_pmd_range mm/memory.c:2648 [inline]
apply_to_pud_range mm/memory.c:2684 [inline]
apply_to_p4d_range mm/memory.c:2720 [inline]
__apply_to_page_range+0x860/0xdd0 mm/memory.c:2756
alloc_vmap_area+0x1d0c/0x1e30 mm/vmalloc.c:1649
__get_vm_area_node+0x162/0x370 mm/vmalloc.c:2620
__vmalloc_node_range+0x36e/0x1330 mm/vmalloc.c:3299
vmalloc_user+0x74/0x80 mm/vmalloc.c:3493
vb2_vmalloc_alloc+0xef/0x330 drivers/media/common/videobuf2/videobuf2-vmalloc.c:47
__vb2_buf_mem_alloc drivers/media/common/videobuf2/videobuf2-core.c:233 [inline]
__vb2_queue_alloc+0x794/0x1410 drivers/media/common/videobuf2/videobuf2-core.c:448
vb2_core_reqbufs+0xa74/0x1180 drivers/media/common/videobuf2/videobuf2-core.c:838
v4l2_m2m_reqbufs drivers/media/v4l2-core/v4l2-mem2mem.c:579 [inline]
v4l2_m2m_ioctl_reqbufs+0x16c/0x230 drivers/media/v4l2-core/v4l2-mem2mem.c:1373
__video_do_ioctl+0xc5e/0xd70 drivers/media/v4l2-core/v4l2-ioctl.c:3049
video_usercopy+0x89f/0x1380 drivers/media/v4l2-core/v4l2-ioctl.c:3390
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
kasan_depopulate_vmalloc_pte+0x75/0x90 mm/kasan/shadow.c:427
apply_to_pte_range mm/memory.c:2604 [inline]
apply_to_pmd_range mm/memory.c:2648 [inline]
apply_to_pud_range mm/memory.c:2684 [inline]
apply_to_p4d_range mm/memory.c:2720 [inline]
__apply_to_page_range+0x860/0xdd0 mm/memory.c:2756
kasan_release_vmalloc+0x97/0xb0 mm/kasan/shadow.c:544
__purge_vmap_area_lazy+0xfa7/0x1af0 mm/vmalloc.c:1778
drain_vmap_area_work+0x40/0xd0 mm/vmalloc.c:1812
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
Memory state around the buggy address:
ffff8880659c3e80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff8880659c3f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8880659c3f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
^
ffff8880659c4000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff8880659c4080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess):
0: 0f 84 33 01 00 00 je 0x139
6: 48 85 db test %rbx,%rbx
9: 0f 85 52 01 00 00 jne 0x161
f: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
14: 4c 8b 75 d0 mov -0x30(%rbp),%r14
18: 4c 89 e7 mov %r12,%rdi
1b: e8 e0 94 34 09 call 0x9349500
20: e8 1b 2f 30 00 call 0x302f40
25: fb sti
26: 4c 8b 65 c0 mov -0x40(%rbp),%r12
* 2a: 49 8d bc 24 f8 15 00 lea 0x15f8(%r12),%rdi <-- trapping instruction
31: 00
32: 48 89 f8 mov %rdi,%rax
35: 48 c1 e8 03 shr $0x3,%rax
39: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax
3e: 84 c0 test %al,%al