==================================================================
BUG: KASAN: slab-out-of-bounds in mcp2221_raw_event+0x106a/0x1240 drivers/hid/hid-mcp2221.c:948
Read of size 1 at addr ffff88805822ffff by task udevd/14513
CPU: 1 UID: 0 PID: 14513 Comm: udevd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xca/0x240 mm/kasan/report.c:482
kasan_report+0x118/0x150 mm/kasan/report.c:595
mcp2221_raw_event+0x106a/0x1240 drivers/hid/hid-mcp2221.c:948
__hid_input_report drivers/hid/hid-core.c:2130 [inline]
hid_input_report+0x40a/0x520 drivers/hid/hid-core.c:2157
hid_irq_in+0x47e/0x6d0 drivers/hid/usbhid/hid-core.c:286
__usb_hcd_giveback_urb+0x376/0x540 drivers/usb/core/hcd.c:1661
dummy_timer+0x862/0x4550 drivers/usb/gadget/udc/dummy_hcd.c:1995
__run_hrtimer kernel/time/hrtimer.c:1777 [inline]
__hrtimer_run_queues+0x529/0xc60 kernel/time/hrtimer.c:1841
hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1858
handle_softirqs+0x283/0x870 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1052
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:netlink_recvmsg+0x183/0xa30 net/netlink/af_netlink.c:1925
Code: 0f 85 ca 06 00 00 41 8b 07 4d 8d 3c 06 49 83 c7 08 4c 89 f8 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 ff e8 30 e1 c1 f8 4d 8b 3f <4d> 85 ff 44 89 6c 24 24 0f 85 76 06 00 00 e8 7a 3f 5c f8 4c 8b 7c
RSP: 0018:ffffc9001aeb78a0 EFLAGS: 00000246
RAX: 1ffff1100b11a441 RBX: ffff88807b14e000 RCX: 1ffff110063f2cba
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888031f965d0
RBP: ffffc9001aeb79c8 R08: ffffffff8f5b9137 R09: 1ffffffff1eb7226
R10: dffffc0000000000 R11: fffffbfff1eb7227 R12: dffffc0000000000
R13: 0000000000000040 R14: ffff8880588d2080 R15: 0000000000000000
sock_recvmsg_nosec net/socket.c:1078 [inline]
sock_recvmsg+0x229/0x270 net/socket.c:1100
____sys_recvmsg+0x1c9/0x460 net/socket.c:2850
___sys_recvmsg+0x1b5/0x510 net/socket.c:2892
__sys_recvmsg net/socket.c:2925 [inline]
__do_sys_recvmsg net/socket.c:2931 [inline]
__se_sys_recvmsg net/socket.c:2928 [inline]
__x64_sys_recvmsg+0x198/0x260 net/socket.c:2928
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff630ea7407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffc1d3189a0 EFLAGS: 00000202 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 00007ff631586880 RCX: 00007ff630ea7407
RDX: 0000000000000000 RSI: 00007ffc1d318a30 RDI: 000000000000000c
RBP: 0000564bbe457910 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000564bbe482550
R13: 00007ffc1d318af0 R14: 00007ffc1d318a3c R15: 0000000000000000
Allocated by task 16552:
kasan_save_stack mm/kasan/common.c:56 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
poison_kmalloc_redzone mm/kasan/common.c:400 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:417
kasan_kmalloc include/linux/kasan.h:262 [inline]
__kmalloc_cache_noprof+0x3d5/0x6f0 mm/slub.c:5724
kmalloc_noprof include/linux/slab.h:957 [inline]
kzalloc_noprof include/linux/slab.h:1094 [inline]
tomoyo_find_next_domain+0xdc/0x1aa0 security/tomoyo/domain.c:710
tomoyo_bprm_check_security+0x11c/0x180 security/tomoyo/tomoyo.c:102
security_bprm_check+0x89/0x270 security/security.c:1341
search_binary_handler fs/exec.c:1660 [inline]
exec_binprm fs/exec.c:1702 [inline]
bprm_execve+0x8ee/0x1450 fs/exec.c:1754
do_execveat_common+0x510/0x6a0 fs/exec.c:1860
do_execve fs/exec.c:1934 [inline]
__do_sys_execve fs/exec.c:2010 [inline]
__se_sys_execve fs/exec.c:2005 [inline]
__x64_sys_execve+0x94/0xb0 fs/exec.c:2005
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 16552:
kasan_save_stack mm/kasan/common.c:56 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
__kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:587
kasan_save_free_info mm/kasan/kasan.h:406 [inline]
poison_slab_object mm/kasan/common.c:252 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284
kasan_slab_free include/linux/kasan.h:234 [inline]
slab_free_hook mm/slub.c:2514 [inline]
slab_free mm/slub.c:6566 [inline]
kfree+0x19a/0x6d0 mm/slub.c:6773
tomoyo_find_next_domain+0x173e/0x1aa0 security/tomoyo/domain.c:892
tomoyo_bprm_check_security+0x11c/0x180 security/tomoyo/tomoyo.c:102
security_bprm_check+0x89/0x270 security/security.c:1341
search_binary_handler fs/exec.c:1660 [inline]
exec_binprm fs/exec.c:1702 [inline]
bprm_execve+0x8ee/0x1450 fs/exec.c:1754
do_execveat_common+0x510/0x6a0 fs/exec.c:1860
do_execve fs/exec.c:1934 [inline]
__do_sys_execve fs/exec.c:2010 [inline]
__se_sys_execve fs/exec.c:2005 [inline]
__x64_sys_execve+0x94/0xb0 fs/exec.c:2005
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88805822fc00
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 511 bytes to the right of
allocated 512-byte region [ffff88805822fc00, ffff88805822fe00)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5822c
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88813fe26c80 ffffea000114f000 dead000000000002
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88813fe26c80 ffffea000114f000 dead000000000002
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea0001608b01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 12, tgid 12 (kworker/u8:0), ts 77568381112, free_ts 23550020686
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1850
prep_new_page mm/page_alloc.c:1858 [inline]
get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3884
__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5183
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416
alloc_slab_page mm/slub.c:3030 [inline]
allocate_slab+0x96/0x3a0 mm/slub.c:3203
new_slab mm/slub.c:3257 [inline]
___slab_alloc+0xe94/0x1920 mm/slub.c:4627
__slab_alloc+0x65/0x100 mm/slub.c:4746
__slab_alloc_node mm/slub.c:4822 [inline]
slab_alloc_node mm/slub.c:5233 [inline]
__kmalloc_cache_noprof+0x411/0x6f0 mm/slub.c:5719
kmalloc_noprof include/linux/slab.h:957 [inline]
batadv_forw_packet_alloc+0x1e9/0x390 net/batman-adv/send.c:506
batadv_iv_ogm_aggregate_new net/batman-adv/bat_iv_ogm.c:570 [inline]
batadv_iv_ogm_queue_add+0x85f/0xd30 net/batman-adv/bat_iv_ogm.c:677
batadv_iv_ogm_schedule_buff net/batman-adv/bat_iv_ogm.c:841 [inline]
batadv_iv_ogm_schedule+0x866/0xf00 net/batman-adv/bat_iv_ogm.c:873
batadv_iv_send_outstanding_bat_ogm_packet+0x6c6/0x7e0 net/batman-adv/bat_iv_ogm.c:1709
process_one_work kernel/workqueue.c:3263 [inline]
process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3346
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
kthread+0x70e/0x8a0 kernel/kthread.c:463
ret_from_fork+0x436/0x7d0 arch/x86/kernel/process.c:148
page last free pid 1 tgid 1 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1394 [inline]
__free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2906
__free_pages mm/page_alloc.c:5302 [inline]
free_contig_range+0x1bd/0x4a0 mm/page_alloc.c:7146
destroy_args+0x69/0x660 mm/debug_vm_pgtable.c:958
debug_vm_pgtable+0x39f/0x3b0 mm/debug_vm_pgtable.c:1345
do_one_initcall+0x233/0x820 init/main.c:1283
do_initcall_level+0x104/0x190 init/main.c:1345
do_initcalls+0x59/0xa0 init/main.c:1361
kernel_init_freeable+0x334/0x4b0 init/main.c:1593
kernel_init+0x1d/0x1d0 init/main.c:1483
ret_from_fork+0x436/0x7d0 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:
ffff88805822fe80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88805822ff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88805822ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff888058230000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff888058230080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess):
0: 0f 85 ca 06 00 00 jne 0x6d0
6: 41 8b 07 mov (%r15),%eax
9: 4d 8d 3c 06 lea (%r14,%rax,1),%r15
d: 49 83 c7 08 add $0x8,%r15
11: 4c 89 f8 mov %r15,%rax
14: 48 c1 e8 03 shr $0x3,%rax
18: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1)
1d: 74 08 je 0x27
1f: 4c 89 ff mov %r15,%rdi
22: e8 30 e1 c1 f8 call 0xf8c1e157
27: 4d 8b 3f mov (%r15),%r15
* 2a: 4d 85 ff test %r15,%r15 <-- trapping instruction
2d: 44 89 6c 24 24 mov %r13d,0x24(%rsp)
32: 0f 85 76 06 00 00 jne 0x6ae
38: e8 7a 3f 5c f8 call 0xf85c3fb7
3d: 4c rex.WR
3e: 8b .byte 0x8b
3f: 7c .byte 0x7c