==================================================================
BUG: KASAN: slab-out-of-bounds in mcp2221_raw_event+0xf94/0x1030 drivers/hid/hid-mcp2221.c:944
Read of size 1 at addr ffff88805754bfff by task syz.3.594/8433
CPU: 1 UID: 0 PID: 8433 Comm: syz.3.594 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+0xf94/0x1030 drivers/hid/hid-mcp2221.c:944
__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:finish_task_switch.isra.0+0x22a/0xc10 kernel/sched/core.c:5225
Code: fb 09 00 00 44 8b 05 e9 73 22 0f 45 85 c0 0f 85 be 01 00 00 4c 89 e7 e8 a4 f6 ff ff e8 9f 68 3a 00 fb 65 48 8b 1d 8e 65 4d 12 <48> 8d bb 18 16 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1
RSP: 0018:ffffc90005877728 EFLAGS: 00000202
RAX: 00000000000015a7 RBX: ffff888026d94880 RCX: ffffffff81c3721f
RDX: 0000000000000000 RSI: ffffffff8de50220 RDI: ffffffff8c162900
RBP: ffffc90005877770 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90ab4c97 R11: 0000000000000000 R12: ffff8880b853a300
R13: ffff888030a5a440 R14: ffff8880b843a300 R15: ffff8880b853b170
context_switch kernel/sched/core.c:5360 [inline]
__schedule+0x1198/0x5de0 kernel/sched/core.c:6961
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7288
irqentry_exit+0x36/0x90 kernel/entry/common.c:197
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:unwind_get_return_address+0x0/0xa0 arch/x86/kernel/unwind_orc.c:365
Code: 2f ff ff ff e8 31 08 b7 00 eb a8 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 48 b8 00 00 00 00 00 fc ff df 48 89 fa 55 48 c1 ea 03
RSP: 0018:ffffc90005877a10 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffc90005877a18 RCX: ffffc9000587796c
RDX: 0000000000000000 RSI: ffffffff8de2acf0 RDI: ffffc90005877a18
RBP: ffffc90005877aa8 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 00000000000121b4 R12: ffffffff81a6db90
R13: ffffc90005877ad8 R14: 0000000000000000 R15: ffff888026d94880
arch_stack_walk+0xa6/0x100 arch/x86/kernel/stacktrace.c:26
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
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:243 [inline]
__kasan_slab_free+0x60/0x70 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+0x2b4/0x4d0 mm/slub.c:4879
raw_ioctl_ep_write drivers/usb/gadget/legacy/raw_gadget.c:1153 [inline]
raw_ioctl+0xab6/0x2c30 drivers/usb/gadget/legacy/raw_gadget.c:1324
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:598 [inline]
__se_sys_ioctl fs/ioctl.c:584 [inline]
__x64_sys_ioctl+0x18b/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: 0033:0x7f2a7118e7eb
Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00
RSP: 002b:00007f2a7204cf70 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f2a7118e7eb
RDX: 00007f2a7204cff0 RSI: 0000000040085507 RDI: 0000000000000007
RBP: 0000000000000007 R08: 00007f2a714e0320 R09: 0000000000000000
R10: 0000000000000007 R11: 0000000000000246 R12: 0000200000000040
R13: 0000000000000000 R14: 00007f2a713b5fa0 R15: 00007ffdfc487178
Allocated by task 5856:
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
kmalloc_noprof include/linux/slab.h:905 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
inetdev_init+0x66/0x5a0 net/ipv4/devinet.c:273
inetdev_event+0xc5f/0x18a0 net/ipv4/devinet.c:1591
notifier_call_chain+0xbc/0x410 kernel/notifier.c:85
call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2229
call_netdevice_notifiers_extack net/core/dev.c:2267 [inline]
call_netdevice_notifiers net/core/dev.c:2281 [inline]
register_netdevice+0x182e/0x2270 net/core/dev.c:11244
veth_newlink+0x446/0xa00 drivers/net/veth.c:1884
rtnl_newlink_create net/core/rtnetlink.c:3825 [inline]
__rtnl_newlink net/core/rtnetlink.c:3942 [inline]
rtnl_newlink+0xc45/0x2000 net/core/rtnetlink.c:4057
rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:6946
netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2552
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x5a7/0x870 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1896
sock_sendmsg_nosec net/socket.c:714 [inline]
__sock_sendmsg net/socket.c:729 [inline]
__sys_sendto+0x4a3/0x520 net/socket.c:2228
__do_sys_sendto net/socket.c:2235 [inline]
__se_sys_sendto net/socket.c:2231 [inline]
__x64_sys_sendto+0xe0/0x1c0 net/socket.c:2231
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 ffff88805754bc00
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 [ffff88805754bc00, ffff88805754be00)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88805754a400 pfn:0x57548
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000240 ffff88801b841c80 ffffea000154b010 ffffea0000c46610
raw: ffff88805754a400 000000000010000f 00000000f5000000 0000000000000000
head: 00fff00000000240 ffff88801b841c80 ffffea000154b010 ffffea0000c46610
head: ffff88805754a400 000000000010000f 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea00015d5201 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5847, tgid 5847 (syz-executor), ts 80610165155, free_ts 23528345242
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]
kzalloc_noprof include/linux/slab.h:1039 [inline]
device_private_init drivers/base/core.c:3534 [inline]
device_add+0xccc/0x1aa0 drivers/base/core.c:3585
netdev_register_kobject+0x1a9/0x3d0 net/core/net-sysfs.c:2356
register_netdevice+0x13dc/0x2270 net/core/dev.c:11206
veth_newlink+0x30f/0xa00 drivers/net/veth.c:1855
rtnl_newlink_create net/core/rtnetlink.c:3825 [inline]
__rtnl_newlink net/core/rtnetlink.c:3942 [inline]
rtnl_newlink+0xc45/0x2000 net/core/rtnetlink.c:4057
rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:6946
netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2552
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x5a7/0x870 net/netlink/af_netlink.c:1346
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:1395 [inline]
__free_frozen_pages+0x7d5/0x10f0 mm/page_alloc.c:2895
__free_pages mm/page_alloc.c:5260 [inline]
free_contig_range+0x183/0x4b0 mm/page_alloc.c:7091
destroy_args+0x794/0xc10 mm/debug_vm_pgtable.c:958
debug_vm_pgtable+0x1a32/0x3640 mm/debug_vm_pgtable.c:1345
do_one_initcall+0x120/0x6e0 init/main.c:1269
do_initcall_level init/main.c:1331 [inline]
do_initcalls init/main.c:1347 [inline]
do_basic_setup init/main.c:1366 [inline]
kernel_init_freeable+0x5c2/0x910 init/main.c:1579
kernel_init+0x1c/0x2b0 init/main.c:1469
ret_from_fork+0x5d7/0x6f0 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:
ffff88805754be80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88805754bf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88805754bf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff88805754c000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88805754c080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess):
0: fb sti
1: 09 00 or %eax,(%rax)
3: 00 44 8b 05 add %al,0x5(%rbx,%rcx,4)
7: e9 73 22 0f 45 jmp 0x450f227f
c: 85 c0 test %eax,%eax
e: 0f 85 be 01 00 00 jne 0x1d2
14: 4c 89 e7 mov %r12,%rdi
17: e8 a4 f6 ff ff call 0xfffff6c0
1c: e8 9f 68 3a 00 call 0x3a68c0
21: fb sti
22: 65 48 8b 1d 8e 65 4d mov %gs:0x124d658e(%rip),%rbx # 0x124d65b8
29: 12
* 2a: 48 8d bb 18 16 00 00 lea 0x1618(%rbx),%rdi <-- trapping instruction
31: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
38: fc ff df
3b: 48 89 fa mov %rdi,%rdx
3e: 48 rex.W
3f: c1 .byte 0xc1