==================================================================
BUG: KASAN: slab-out-of-bounds in mcp2221_raw_event+0xf94/0x1030 drivers/hid/hid-mcp2221.c:944
Read of size 1 at addr ffff8881248cffff by task klogd/2835
CPU: 0 UID: 0 PID: 2835 Comm: klogd 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:vsnprintf+0x16e/0x1160 lib/vsprintf.c:2869
Code: 4c 89 e0 48 8b 54 24 30 88 dc 48 89 c6 e8 ba 0e ff ff 48 c7 c6 60 54 57 88 48 89 c3 49 89 d4 0f b6 c6 0f b6 fa 48 89 44 24 38 <41> 89 d6 e8 fa b1 42 fa 41 80 fc 04 0f 84 19 08 00 00 0f 87 d7 01
RSP: 0018:ffffc900015378b8 EFLAGS: 00000292
RAX: 0000000000000008 RBX: ffffffff87692a65 RCX: 0000000000000000
RDX: 0000000000000801 RSI: ffffffff88575460 RDI: 0000000000000001
RBP: ffffc90001537990 R08: 0000000000000001 R09: 0000000000000000
R10: 000000000000000a R11: 0000000000a02640 R12: 0000000000000801
R13: ffffffff87692a61 R14: 0000000000000000 R15: 0000000000000025
sprintf+0xcc/0x100 lib/vsprintf.c:3089
print_time kernel/printk/printk.c:1381 [inline]
info_print_prefix+0x25a/0x350 kernel/printk/printk.c:1407
record_print_text+0x140/0x400 kernel/printk/printk.c:1456
syslog_print+0x46a/0x620 kernel/printk/printk.c:1667
do_syslog+0x3dc/0x6c0 kernel/printk/printk.c:1785
__do_sys_syslog kernel/printk/printk.c:1877 [inline]
__se_sys_syslog kernel/printk/printk.c:1875 [inline]
__x64_sys_syslog+0x74/0xb0 kernel/printk/printk.c:1875
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: 0033:0x7f5ec43c1a37
Code: 73 01 c3 48 8b 0d c1 f3 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 67 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 91 f3 0c 00 f7 d8 64 89 01 48
RSP: 002b:00007ffd9d2d3e28 EFLAGS: 00000206 ORIG_RAX: 0000000000000067
RAX: ffffffffffffffda RBX: 00007f5ec4561490 RCX: 00007f5ec43c1a37
RDX: 00000000000003ff RSI: 00007f5ec4561490 RDI: 0000000000000002
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000004000 R11: 0000000000000206 R12: 00007f5ec4561490
R13: 00007f5ec453edfe R14: 00007f5ec456165e R15: 00007f5ec456165e
Allocated by task 6421:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:388 [inline]
__kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:405
kasan_kmalloc include/linux/kasan.h:260 [inline]
__do_kmalloc_node mm/slub.c:4365 [inline]
__kvmalloc_node_noprof+0x273/0x5d0 mm/slub.c:5052
seq_buf_alloc fs/seq_file.c:38 [inline]
seq_read_iter+0x826/0x12c0 fs/seq_file.c:210
kernfs_fop_read_iter+0x40f/0x5a0 fs/kernfs/file.c:279
new_sync_read fs/read_write.c:491 [inline]
vfs_read+0x8bc/0xcf0 fs/read_write.c:572
ksys_read+0x12a/0x250 fs/read_write.c:715
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 6421:
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]
kfree+0x283/0x470 mm/slub.c:4879
seq_release+0x4b/0x80 fs/seq_file.c:355
kernfs_fop_release+0xf4/0x1e0 fs/kernfs/file.c:766
__fput+0x402/0xb70 fs/file_table.c:468
fput_close_sync+0x118/0x210 fs/file_table.c:573
__do_sys_close fs/open.c:1587 [inline]
__se_sys_close fs/open.c:1572 [inline]
__x64_sys_close+0x8b/0x120 fs/open.c:1572
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 ffff8881248ce000
which belongs to the cache kmalloc-cg-4k of size 4096
The buggy address is located 4095 bytes to the right of
allocated 4096-byte region [ffff8881248ce000, ffff8881248cf000)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1248c8
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff8881245b5dc1
flags: 0x200000000000040(head|node=0|zone=2)
page_type: f5(slab)
raw: 0200000000000040 ffff88810004b500 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000040004 00000000f5000000 ffff8881245b5dc1
head: 0200000000000040 ffff88810004b500 dead000000000100 dead000000000122
head: 0000000000000000 0000000000040004 00000000f5000000 ffff8881245b5dc1
head: 0200000000000003 ffffea0004923201 00000000ffffffff 00000000ffffffff
head: 00000007f160f758 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5222, tgid 5222 (udevd), ts 1516620665196, free_ts 1501756776975
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]
__do_kmalloc_node mm/slub.c:4364 [inline]
__kvmalloc_node_noprof+0x1c1/0x5d0 mm/slub.c:5052
seq_buf_alloc fs/seq_file.c:38 [inline]
seq_read_iter+0x826/0x12c0 fs/seq_file.c:210
kernfs_fop_read_iter+0x40f/0x5a0 fs/kernfs/file.c:279
new_sync_read fs/read_write.c:491 [inline]
vfs_read+0x8bc/0xcf0 fs/read_write.c:572
ksys_read+0x12a/0x250 fs/read_write.c:715
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 19410 tgid 19410 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
discard_slab mm/slub.c:2753 [inline]
__put_partials+0x165/0x1c0 mm/slub.c:3218
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x4d/0x120 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x4e/0x70 mm/kasan/common.c:340
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
vm_area_dup+0x25/0x6c0 mm/vma_init.c:122
__split_vma+0x18e/0x1040 mm/vma.c:515
vms_gather_munmap_vmas+0x3b1/0x12c0 mm/vma.c:1380
__mmap_prepare mm/vma.c:2359 [inline]
__mmap_region+0x436/0x25d0 mm/vma.c:2651
mmap_region+0x1ab/0x3f0 mm/vma.c:2739
do_mmap+0xa2e/0x11f0 mm/mmap.c:558
vm_mmap_pgoff+0x201/0x390 mm/util.c:580
ksys_mmap_pgoff+0x32c/0x5c0 mm/mmap.c:604
__do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
__se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]
__x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4b0 arch/x86/entry/syscall_64.c:94
Memory state around the buggy address:
ffff8881248cfe80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8881248cff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8881248cff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff8881248d0000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff8881248d0080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess):
0: 4c 89 e0 mov %r12,%rax
3: 48 8b 54 24 30 mov 0x30(%rsp),%rdx
8: 88 dc mov %bl,%ah
a: 48 89 c6 mov %rax,%rsi
d: e8 ba 0e ff ff call 0xffff0ecc
12: 48 c7 c6 60 54 57 88 mov $0xffffffff88575460,%rsi
19: 48 89 c3 mov %rax,%rbx
1c: 49 89 d4 mov %rdx,%r12
1f: 0f b6 c6 movzbl %dh,%eax
22: 0f b6 fa movzbl %dl,%edi
25: 48 89 44 24 38 mov %rax,0x38(%rsp)
* 2a: 41 89 d6 mov %edx,%r14d <-- trapping instruction
2d: e8 fa b1 42 fa call 0xfa42b22c
32: 41 80 fc 04 cmp $0x4,%r12b
36: 0f 84 19 08 00 00 je 0x855
3c: 0f .byte 0xf
3d: 87 d7 xchg %edx,%edi
3f: 01 .byte 0x1