==================================================================
BUG: KASAN: slab-out-of-bounds in mcp2221_raw_event+0xf94/0x1030 drivers/hid/hid-mcp2221.c:944
Read of size 1 at addr ffff888121dabfff by task syz.3.2314/13626
CPU: 0 UID: 0 PID: 13626 Comm: syz.3.2314 Not tainted syzkaller #0 PREEMPT(voluntary)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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+0xf94/0x1030 drivers/hid/hid-mcp2221.c:944
__hid_input_report.constprop.0+0x314/0x450 drivers/hid/hid-core.c:2130
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+0x1814/0x3a30 drivers/usb/gadget/udc/dummy_hcd.c:1995
__run_hrtimer kernel/time/hrtimer.c:1761 [inline]
__hrtimer_run_queues+0x1ff/0xad0 kernel/time/hrtimer.c:1825
hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1842
handle_softirqs+0x208/0x8d0 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xfa/0x160 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:ktime_add_safe+0x4c/0x70 kernel/time/hrtimer.c:355
Code: 48 85 db 78 2a e8 d4 47 13 00 48 89 de 48 89 ef e8 79 42 13 00 48 39 dd 7f 15 e8 bf 47 13 00 48 89 de 4c 89 e7 e8 64 42 13 00 <49> 39 dc 7e 0a 48 bb ff ff ff ff ff ff ff 7f e8 a0 47 13 00 48 89
RSP: 0018:ffffc90015417e28 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 00000122f97b1d3a RCX: ffffffff816ab09c
RDX: ffff8881147b9d00 RSI: 0000000014dc9380 RDI: 0000000000000006
RBP: 00000122e49e89ba R08: 0000000000000006 R09: 0000000014dc9380
R10: 00000122f97b1d3a R11: 0000000000000000 R12: 0000000014dc9380
R13: 0000000000000080 R14: 0000000000000000 R15: 0000000cb2b7e8af
futex_init_timeout kernel/futex/syscalls.c:154 [inline]
__do_sys_futex kernel/futex/syscalls.c:173 [inline]
__se_sys_futex kernel/futex/syscalls.c:160 [inline]
__x64_sys_futex+0x3b4/0x4c0 kernel/futex/syscalls.c:160
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3b77aaebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdb2b7e5b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 0000000000131060 RCX: 00007f3b77aaebe9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f3b77cd5fac
RBP: 000000000000015e R08: 00007f3b78812000 R09: 0000000cb2b7e8af
R10: 00007ffdb2b7e6b0 R11: 0000000000000246 R12: 00007f3b77cd5fac
R13: 00007ffdb2b7e6b0 R14: 00000000001311be R15: 00007ffdb2b7e6d0
Allocated by task 13476:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
unpoison_slab_object mm/kasan/common.c:330 [inline]
__kasan_slab_alloc+0x6e/0x70 mm/kasan/common.c:356
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4180 [inline]
slab_alloc_node mm/slub.c:4229 [inline]
kmem_cache_alloc_noprof+0x14f/0x3b0 mm/slub.c:4236
anon_vma_chain_alloc mm/rmap.c:142 [inline]
anon_vma_clone+0xd8/0x5c0 mm/rmap.c:288
anon_vma_fork+0x7a/0x620 mm/rmap.c:351
dup_mmap+0x13eb/0x2050 mm/mmap.c:1797
dup_mm kernel/fork.c:1485 [inline]
copy_mm kernel/fork.c:1537 [inline]
copy_process+0x705a/0x7580 kernel/fork.c:2175
kernel_clone+0xfc/0x930 kernel/fork.c:2605
__do_sys_clone+0xce/0x120 kernel/fork.c:2748
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 13479:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:243 [inline]
__kasan_slab_free+0x3e/0x50 mm/kasan/common.c:275
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2417 [inline]
slab_free mm/slub.c:4680 [inline]
kmem_cache_free+0x2a0/0x470 mm/slub.c:4782
anon_vma_chain_free mm/rmap.c:147 [inline]
unlink_anon_vmas+0x173/0x820 mm/rmap.c:421
free_pgtables+0x212/0xc00 mm/memory.c:413
exit_mmap+0x3fb/0xb90 mm/mmap.c:1291
__mmput kernel/fork.c:1130 [inline]
mmput+0xdb/0x430 kernel/fork.c:1152
exit_mm kernel/exit.c:582 [inline]
do_exit+0x7c7/0x2bf0 kernel/exit.c:949
do_group_exit+0xd3/0x2a0 kernel/exit.c:1102
__do_sys_exit_group kernel/exit.c:1113 [inline]
__se_sys_exit_group kernel/exit.c:1111 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1111
x64_sys_call+0x14fa/0x1720 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff888121dabf50
which belongs to the cache anon_vma_chain of size 80
The buggy address is located 95 bytes to the right of
allocated 80-byte region [ffff888121dabf50, ffff888121dabfa0)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x121dab
memcg:ffff888138958401
flags: 0x200000000000000(node=0|zone=2)
page_type: f5(slab)
raw: 0200000000000000 ffff88810129e280 ffffea0004d557c0 dead000000000004
raw: 0000000000000000 0000000000240024 00000000f5000000 ffff888138958401
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP), pid 5739, tgid 5739 (udevd), ts 997072224728, free_ts 997032671001
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1851
prep_new_page mm/page_alloc.c:1859 [inline]
get_page_from_freelist+0xf98/0x2ce0 mm/page_alloc.c:3858
__alloc_frozen_pages_noprof+0x259/0x21e0 mm/page_alloc.c:5148
alloc_pages_mpol+0xe4/0x410 mm/mempolicy.c:2416
alloc_slab_page mm/slub.c:2487 [inline]
allocate_slab mm/slub.c:2655 [inline]
new_slab+0x247/0x330 mm/slub.c:2709
___slab_alloc+0xc78/0x1680 mm/slub.c:3891
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3981
__slab_alloc_node mm/slub.c:4056 [inline]
slab_alloc_node mm/slub.c:4217 [inline]
kmem_cache_alloc_noprof+0x1f9/0x3b0 mm/slub.c:4236
anon_vma_chain_alloc mm/rmap.c:142 [inline]
anon_vma_clone+0xd8/0x5c0 mm/rmap.c:288
anon_vma_fork+0x7a/0x620 mm/rmap.c:351
dup_mmap+0x13eb/0x2050 mm/mmap.c:1797
dup_mm kernel/fork.c:1485 [inline]
copy_mm kernel/fork.c:1537 [inline]
copy_process+0x705a/0x7580 kernel/fork.c:2175
kernel_clone+0xfc/0x930 kernel/fork.c:2605
__do_sys_clone+0xce/0x120 kernel/fork.c:2748
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 22 tgid 22 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1395 [inline]
__free_frozen_pages+0x78a/0xfd0 mm/page_alloc.c:2895
pagetable_free include/linux/mm.h:2898 [inline]
pagetable_dtor_free include/linux/mm.h:2996 [inline]
__tlb_remove_table include/asm-generic/tlb.h:220 [inline]
__tlb_remove_table_free mm/mmu_gather.c:227 [inline]
tlb_remove_table_rcu+0x116/0x1a0 mm/mmu_gather.c:290
rcu_do_batch kernel/rcu/tree.c:2605 [inline]
rcu_core+0x799/0x1530 kernel/rcu/tree.c:2861
handle_softirqs+0x208/0x8d0 kernel/softirq.c:579
run_ksoftirqd kernel/softirq.c:968 [inline]
run_ksoftirqd+0x3a/0x60 kernel/softirq.c:960
smpboot_thread_fn+0x3f4/0xae0 kernel/smpboot.c:160
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x5b6/0x6c0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Memory state around the buggy address:
ffff888121dabe80: fb fb fb fb fb fb fb fb fc fc fc fc fa fb fb fb
ffff888121dabf00: fb fb fb fb fb fb fc fc fc fc fa fb fb fb fb fb
>ffff888121dabf80: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff888121dac000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff888121dac080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess):
0: 48 85 db test %rbx,%rbx
3: 78 2a js 0x2f
5: e8 d4 47 13 00 call 0x1347de
a: 48 89 de mov %rbx,%rsi
d: 48 89 ef mov %rbp,%rdi
10: e8 79 42 13 00 call 0x13428e
15: 48 39 dd cmp %rbx,%rbp
18: 7f 15 jg 0x2f
1a: e8 bf 47 13 00 call 0x1347de
1f: 48 89 de mov %rbx,%rsi
22: 4c 89 e7 mov %r12,%rdi
25: e8 64 42 13 00 call 0x13428e
* 2a: 49 39 dc cmp %rbx,%r12 <-- trapping instruction
2d: 7e 0a jle 0x39
2f: 48 bb ff ff ff ff ff movabs $0x7fffffffffffffff,%rbx
36: ff ff 7f
39: e8 a0 47 13 00 call 0x1347de
3e: 48 rex.W
3f: 89 .byte 0x89