==================================================================
BUG: KASAN: slab-out-of-bounds in mcp2221_raw_event+0x1070/0x10a0 drivers/hid/hid-mcp2221.c:948
Read of size 1 at addr ffff8880515dbfff by task syz.4.1111/10464
CPU: 0 UID: 0 PID: 10464 Comm: syz.4.1111 Not tainted syzkaller #0 PREEMPT(full)
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+0x1070/0x10a0 drivers/hid/hid-mcp2221.c:948
__hid_input_report.constprop.0+0x311/0x450 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+0x216/0x8e0 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0x109/0x170 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+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__schedule+0x1198/0x5de0 kernel/sched/core.c:6971
Code: fa 48 c1 ea 03 80 3c 02 00 0f 85 83 43 00 00 49 89 5e 10 48 8b bd 10 ff ff ff 48 89 de e8 f0 3d 97 f5 48 89 c7 e8 38 36 f4 f5 <8b> bd 08 ff ff ff e8 ed f5 f3 f5 48 8b b5 90 fe ff ff 48 b8 00 00
RSP: 0018:ffffc90004767490 EFLAGS: 00000206
RAX: 0000000000002a05 RBX: ffff888032b8a440 RCX: 0000000000000007
RDX: 0000000000000000 RSI: ffffffff8de50a40 RDI: ffffffff8c162a00
RBP: ffffc90004767648 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90ab5297 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: ffff8880b843a300 R15: ffff888032b8a440
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7288
irqentry_exit+0x36/0x90 kernel/entry/common.c:197
asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:709
RIP: 0010:its_return_thunk+0x0/0x10 arch/x86/lib/retpoline.S:412
Code: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 e9 db 1e 95 f5 cc
RSP: 0018:ffffc90004767720 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffffc90004767888 RCX: ffffc90004768001
RDX: ffffc90004767890 RSI: ffffc90004767878 RDI: ffffc900047677f8
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 00000000000061ee R12: ffffc90004767838
R13: ffffc900047677e8 R14: ffffc90004767888 R15: ffffc9000476781c
rcu_read_unlock include/linux/rcupdate.h:869 [inline]
class_rcu_destructor include/linux/rcupdate.h:1155 [inline]
unwind_next_frame+0x3de/0x20a0 arch/x86/kernel/unwind_orc.c:479
__unwind_start+0x45f/0x7f0 arch/x86/kernel/unwind_orc.c:758
unwind_start arch/x86/include/asm/unwind.h:64 [inline]
arch_stack_walk+0x73/0x100 arch/x86/kernel/stacktrace.c:24
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
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+0xaa/0xb0 mm/kasan/common.c:405
kasan_kmalloc include/linux/kasan.h:260 [inline]
__do_kmalloc_node mm/slub.c:4365 [inline]
__kmalloc_noprof+0x223/0x510 mm/slub.c:4377
kmalloc_noprof include/linux/slab.h:909 [inline]
tomoyo_realpath_from_path+0xc2/0x6e0 security/tomoyo/realpath.c:251
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_path_number_perm+0x245/0x580 security/tomoyo/file.c:723
security_file_ioctl+0x9b/0x240 security/security.c:2943
__do_sys_ioctl fs/ioctl.c:592 [inline]
__se_sys_ioctl fs/ioctl.c:584 [inline]
__x64_sys_ioctl+0xb7/0x210 fs/ioctl.c:584
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdb9f18ebe9
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:00007fdb9ff6b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fdb9f3c6090 RCX: 00007fdb9f18ebe9
RDX: 0000200000000000 RSI: 00000000c028aa03 RDI: 000000000000000a
RBP: 00007fdb9f211e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdb9f3c6128 R14: 00007fdb9f3c6090 R15: 00007fff54266638
Allocated by task 5845:
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+0xaa/0xb0 mm/kasan/common.c:405
kasan_kmalloc include/linux/kasan.h:260 [inline]
__do_kmalloc_node mm/slub.c:4365 [inline]
__kmalloc_node_noprof+0x21e/0x500 mm/slub.c:4371
kmalloc_array_node_noprof include/linux/slab.h:1020 [inline]
alloc_slab_obj_exts+0x41/0xa0 mm/slub.c:2028
__memcg_slab_post_alloc_hook+0x255/0x960 mm/memcontrol.c:3174
memcg_slab_post_alloc_hook mm/slub.c:2216 [inline]
slab_post_alloc_hook mm/slub.c:4190 [inline]
slab_alloc_node mm/slub.c:4229 [inline]
__do_kmalloc_node mm/slub.c:4364 [inline]
__kmalloc_noprof+0x3f9/0x510 mm/slub.c:4377
kmalloc_noprof include/linux/slab.h:909 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
lsm_blob_alloc+0x68/0x90 security/security.c:684
lsm_cred_alloc security/security.c:701 [inline]
security_prepare_creds+0x30/0x270 security/security.c:3271
prepare_creds+0x56f/0x7d0 kernel/cred.c:242
copy_creds+0xa7/0xa50 kernel/cred.c:312
copy_process+0xff6/0x7690 kernel/fork.c:2038
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/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff8880515dbf00
which belongs to the cache kmalloc-128 of size 128
The buggy address is located 127 bytes to the right of
allocated 128-byte region [ffff8880515dbf00, ffff8880515dbf80)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x515db
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801b841a00 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000100010 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 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 6352, tgid 6352 (dhcpcd-run-hook), ts 104887827424, free_ts 103822123938
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+0x132b/0x38e0 mm/page_alloc.c:3858
__alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:5148
alloc_pages_mpol+0x1fb/0x550 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+0xcf2/0x1740 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]
__kmalloc_cache_noprof+0xfb/0x3e0 mm/slub.c:4391
kmalloc_noprof include/linux/slab.h:905 [inline]
dummy_urb_enqueue+0xa3/0x920 drivers/usb/gadget/udc/dummy_hcd.c:1273
usb_hcd_submit_urb+0x25b/0x1c60 drivers/usb/core/hcd.c:1546
usb_submit_urb+0x890/0x1770 drivers/usb/core/urb.c:581
ld_usb_interrupt_in_callback+0x459/0x730 drivers/usb/misc/ldusb.c:263
__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
page last free pid 6330 tgid 6322 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1395 [inline]
free_unref_folios+0xa61/0x16b0 mm/page_alloc.c:2952
folios_put_refs+0x56f/0x740 mm/swap.c:997
folio_batch_release include/linux/pagevec.h:101 [inline]
truncate_inode_pages_range+0x311/0xe50 mm/truncate.c:383
evict+0x78c/0x920 fs/inode.c:812
iput_final fs/inode.c:1897 [inline]
iput fs/inode.c:1923 [inline]
iput+0x521/0x880 fs/inode.c:1909
dentry_unlink_inode+0x29c/0x480 fs/dcache.c:466
__dentry_kill+0x1d0/0x600 fs/dcache.c:669
shrink_kill fs/dcache.c:1114 [inline]
shrink_dentry_list+0x140/0x5d0 fs/dcache.c:1141
shrink_dcache_parent+0xe1/0x530 fs/dcache.c:1575
do_one_tree fs/dcache.c:1604 [inline]
shrink_dcache_for_umount+0xa5/0x3e0 fs/dcache.c:1621
generic_shutdown_super+0x6c/0x390 fs/super.c:621
kill_anon_super fs/super.c:1282 [inline]
kill_litter_super+0x70/0xa0 fs/super.c:1292
deactivate_locked_super+0xc1/0x1a0 fs/super.c:474
deactivate_super fs/super.c:507 [inline]
deactivate_super+0xde/0x100 fs/super.c:503
cleanup_mnt+0x225/0x450 fs/namespace.c:1375
task_work_run+0x14d/0x240 kernel/task_work.c:227
Memory state around the buggy address:
ffff8880515dbe80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8880515dbf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880515dbf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff8880515dc000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff8880515dc080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess):
0: fa cli
1: 48 c1 ea 03 shr $0x3,%rdx
5: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
9: 0f 85 83 43 00 00 jne 0x4392
f: 49 89 5e 10 mov %rbx,0x10(%r14)
13: 48 8b bd 10 ff ff ff mov -0xf0(%rbp),%rdi
1a: 48 89 de mov %rbx,%rsi
1d: e8 f0 3d 97 f5 call 0xf5973e12
22: 48 89 c7 mov %rax,%rdi
25: e8 38 36 f4 f5 call 0xf5f43662
* 2a: 8b bd 08 ff ff ff mov -0xf8(%rbp),%edi <-- trapping instruction
30: e8 ed f5 f3 f5 call 0xf5f3f622
35: 48 8b b5 90 fe ff ff mov -0x170(%rbp),%rsi
3c: 48 rex.W
3d: b8 .byte 0xb8