==================================================================
BUG: KASAN: use-after-free in mcp2221_raw_event+0x1070/0x10a0 drivers/hid/hid-mcp2221.c:948
Read of size 1 at addr ffff88811e6abfff by task kworker/1:3/5228
CPU: 1 UID: 0 PID: 5228 Comm: kworker/1:3 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+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+0x314/0x470 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+0x1809/0x3ad0 drivers/usb/gadget/udc/dummy_hcd.c:1995
__run_hrtimer kernel/time/hrtimer.c:1777 [inline]
__hrtimer_run_queues+0x202/0xc40 kernel/time/hrtimer.c:1841
hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1858
handle_softirqs+0x208/0x940 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:1056 [inline]
sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:console_flush_one_record+0x995/0xc60 kernel/printk/printk.c:3216
Code: 00 e8 4f 65 29 00 9c 5d 81 e5 00 02 00 00 31 ff 48 89 ee e8 4d 49 21 00 48 85 ed 0f 85 8e 01 00 00 e8 6f 4e 21 00 fb 4c 89 e8 <48> c1 e8 03 42 80 3c 38 00 0f 84 b4 fe ff ff 4c 89 ef e8 74 12 83
RSP: 0018:ffffc9000234f108 EFLAGS: 00000246
RAX: ffffffff898160f8 RBX: 0000000000000001 RCX: ffffc9001003b000
RDX: 0000000000100000 RSI: ffffffff815e9e01 RDI: 0000000000000007
RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: ffff88811392c528 R12: 0000000000000000
R13: ffffffff898160f8 R14: ffffffff898160a0 R15: dffffc0000000000
console_flush_all kernel/printk/printk.c:3289 [inline]
__console_flush_and_unlock kernel/printk/printk.c:3319 [inline]
console_unlock+0xef/0x240 kernel/printk/printk.c:3359
vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2426
dev_vprintk_emit drivers/base/core.c:4914 [inline]
dev_printk_emit+0xfa/0x140 drivers/base/core.c:4925
__dev_printk+0xf5/0x270 drivers/base/core.c:4937
_dev_notice+0xe4/0x120 drivers/base/core.c:4982
usb_parse_endpoint drivers/usb/core/config.c:344 [inline]
usb_parse_interface drivers/usb/core/config.c:636 [inline]
usb_parse_configuration drivers/usb/core/config.c:849 [inline]
usb_get_configuration+0x33a4/0x63a0 drivers/usb/core/config.c:998
usb_enumerate_device drivers/usb/core/hub.c:2527 [inline]
usb_new_device+0x11f9/0x1a90 drivers/usb/core/hub.c:2665
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+0x31bf/0x5420 drivers/usb/core/hub.c:5953
process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257
process_scheduled_works kernel/workqueue.c:3340 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x74f/0xa30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11e6ab
flags: 0x200000000000000(node=0|zone=2)
raw: 0200000000000000 0000000000000000 00000000ffffffff 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 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4454, tgid 4454 (modprobe), ts 87125291110, free_ts 106604270525
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1af/0x220 mm/page_alloc.c:1846
prep_new_page mm/page_alloc.c:1854 [inline]
get_page_from_freelist+0x1058/0x3cb0 mm/page_alloc.c:3915
__alloc_frozen_pages_noprof+0x259/0x21c0 mm/page_alloc.c:5210
alloc_pages_mpol+0xe4/0x410 mm/mempolicy.c:2486
alloc_slab_page mm/slub.c:3075 [inline]
allocate_slab mm/slub.c:3248 [inline]
new_slab+0x2c3/0x430 mm/slub.c:3302
___slab_alloc+0xe20/0x1ca0 mm/slub.c:4656
__kmem_cache_alloc_bulk+0x1fb/0x6c0 mm/slub.c:7429
refill_sheaf mm/slub.c:2650 [inline]
alloc_full_sheaf mm/slub.c:2671 [inline]
__pcs_replace_empty_main+0x2b2/0x4e0 mm/slub.c:5033
alloc_from_pcs mm/slub.c:5121 [inline]
slab_alloc_node mm/slub.c:5248 [inline]
kmem_cache_alloc_noprof+0x58d/0x740 mm/slub.c:5270
mt_alloc_one lib/maple_tree.c:174 [inline]
mas_alloc_nodes+0x27b/0x380 lib/maple_tree.c:1110
mas_preallocate+0x5e3/0xee0 lib/maple_tree.c:5194
vma_iter_prealloc mm/vma.h:502 [inline]
__mmap_new_vma mm/vma.c:2478 [inline]
__mmap_region+0x1189/0x2750 mm/vma.c:2708
mmap_region+0x1ab/0x3f0 mm/vma.c:2786
do_mmap+0xa2e/0x11f0 mm/mmap.c:558
vm_mmap_pgoff+0x201/0x390 mm/util.c:581
vm_mmap+0x8e/0xc0 mm/util.c:617
page last free pid 2981 tgid 2981 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1395 [inline]
__free_frozen_pages+0x795/0x1010 mm/page_alloc.c:2943
discard_slab mm/slub.c:3346 [inline]
__put_partials+0x130/0x170 mm/slub.c:3886
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x4c/0xf0 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x195/0x1e0 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_noprof+0x26e/0x740 mm/slub.c:5270
ptlock_alloc+0x1f/0x70 mm/memory.c:7377
ptlock_init include/linux/mm.h:3280 [inline]
pagetable_pte_ctor include/linux/mm.h:3334 [inline]
__pte_alloc_one_noprof include/asm-generic/pgalloc.h:79 [inline]
pte_alloc_one+0x84/0x3d0 arch/x86/mm/pgtable.c:18
__pte_alloc+0x6d/0x3f0 mm/memory.c:453
copy_pte_range mm/memory.c:1237 [inline]
copy_pmd_range mm/memory.c:1392 [inline]
copy_pud_range mm/memory.c:1429 [inline]
copy_p4d_range mm/memory.c:1453 [inline]
copy_page_range+0x1897/0x4d50 mm/memory.c:1535
dup_mmap+0xbb3/0x1ef0 mm/mmap.c:1827
dup_mm kernel/fork.c:1529 [inline]
copy_mm kernel/fork.c:1581 [inline]
copy_process+0x6e4f/0x7340 kernel/fork.c:2221
kernel_clone+0xfc/0x910 kernel/fork.c:2651
__do_sys_clone+0xce/0x120 kernel/fork.c:2792
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x570 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff88811e6abe80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff88811e6abf00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88811e6abf80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
^
ffff88811e6ac000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88811e6ac080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess):
0: 00 e8 add %ch,%al
2: 4f rex.WRXB
3: 65 29 00 sub %eax,%gs:(%rax)
6: 9c pushf
7: 5d pop %rbp
8: 81 e5 00 02 00 00 and $0x200,%ebp
e: 31 ff xor %edi,%edi
10: 48 89 ee mov %rbp,%rsi
13: e8 4d 49 21 00 call 0x214965
18: 48 85 ed test %rbp,%rbp
1b: 0f 85 8e 01 00 00 jne 0x1af
21: e8 6f 4e 21 00 call 0x214e95
26: fb sti
27: 4c 89 e8 mov %r13,%rax
* 2a: 48 c1 e8 03 shr $0x3,%rax <-- trapping instruction
2e: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1)
33: 0f 84 b4 fe ff ff je 0xfffffeed
39: 4c 89 ef mov %r13,%rdi
3c: e8 .byte 0xe8
3d: 74 12 je 0x51
3f: 83 .byte 0x83