==================================================================
BUG: KASAN: slab-out-of-bounds in mcp2221_raw_event+0x1070/0x10a0 drivers/hid/hid-mcp2221.c:948
Read of size 1 at addr ffff888057a9ffff by task syz.6.340/7266
CPU: 0 UID: 0 PID: 7266 Comm: syz.6.340 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
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+0x314/0x450 drivers/hid/hid-core.c:2139
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+0x1809/0x3a00 drivers/usb/gadget/udc/dummy_hcd.c:1995
__run_hrtimer kernel/time/hrtimer.c:1777 [inline]
__hrtimer_run_queues+0x202/0xad0 kernel/time/hrtimer.c:1841
hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1858
handle_softirqs+0x219/0x8e0 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0x109/0x170 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+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1052
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:finish_task_switch.isra.0+0x22a/0xc10 kernel/sched/core.c:5193
Code: fb 09 00 00 44 8b 05 19 37 f8 0e 45 85 c0 0f 85 be 01 00 00 4c 89 e7 e8 a4 f6 ff ff e8 7f d3 3a 00 fb 65 48 8b 1d de 37 17 12 <48> 8d bb 58 16 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1
RSP: 0018:ffffc9000441f8f0 EFLAGS: 00000206
RAX: 0000000000000a0f RBX: ffff88807bcddac0 RCX: ffffffff81c4faaf
RDX: 0000000000000000 RSI: ffffffff8da28a9a RDI: ffffffff8bf07440
RBP: ffffc9000441f938 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90822ed7 R11: 0000000000000001 R12: ffff8880b843a4c0
R13: ffff88801d76bc80 R14: ffff8880b843a4c0 R15: ffff8880b843b2f0
context_switch kernel/sched/core.c:5328 [inline]
__schedule+0x1198/0x5de0 kernel/sched/core.c:6929
preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:7113
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
class_preempt_destructor include/linux/preempt.h:470 [inline]
try_to_wake_up+0xa67/0x1870 kernel/sched/core.c:4145
wake_up_process kernel/sched/core.c:4424 [inline]
wake_up_q+0xa1/0x130 kernel/sched/core.c:1086
futex_wake+0x460/0x530 kernel/futex/waitwake.c:198
do_futex+0x1e3/0x350 kernel/futex/syscalls.c:135
__do_sys_futex kernel/futex/syscalls.c:207 [inline]
__se_sys_futex kernel/futex/syscalls.c:188 [inline]
__x64_sys_futex+0x1e0/0x4c0 kernel/futex/syscalls.c:188
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ffb5638efc9
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:00007ffddc1fda18 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007ffb565e5fa8 RCX: 00007ffb5638efc9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007ffb565e5fa8
RBP: 0000000000000000 R08: 0000000000000013 R09: 00000004dc1fdd0f
R10: 00007ffb565e5fa0 R11: 0000000000000246 R12: 00007ffb565e5fac
R13: 00007ffb565e5fa0 R14: 0000000000001d8e R15: 0000000000000004
Allocated by task 36:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
kasan_save_track+0x14/0x30 mm/kasan/common.c:77
poison_kmalloc_redzone mm/kasan/common.c:400 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:417
kmalloc_noprof include/linux/slab.h:957 [inline]
kzalloc_noprof include/linux/slab.h:1094 [inline]
sta_info_insert_finish net/mac80211/sta_info.c:894 [inline]
sta_info_insert_rcu+0x940/0x3070 net/mac80211/sta_info.c:1009
ieee80211_ibss_finish_sta+0x21f/0x3b0 net/mac80211/ibss.c:568
ieee80211_ibss_add_sta+0x3a8/0x730 net/mac80211/ibss.c:624
ieee80211_update_sta_info net/mac80211/ibss.c:1000 [inline]
ieee80211_rx_bss_info net/mac80211/ibss.c:1092 [inline]
ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1573 [inline]
ieee80211_ibss_rx_queued_mgmt+0x2767/0x2fe0 net/mac80211/ibss.c:1600
ieee80211_iface_process_skb net/mac80211/iface.c:1694 [inline]
ieee80211_iface_work+0xe2e/0x1360 net/mac80211/iface.c:1748
cfg80211_wiphy_work+0x2c7/0x580 net/wireless/core.c:435
process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3263
process_scheduled_works kernel/workqueue.c:3346 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3427
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Freed by task 36:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
kasan_save_track+0x14/0x30 mm/kasan/common.c:77
__kasan_save_free_info+0x3b/0x60 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+0x5f/0x80 mm/kasan/common.c:284
kasan_slab_free include/linux/kasan.h:234 [inline]
slab_free_hook mm/slub.c:2539 [inline]
slab_free mm/slub.c:6630 [inline]
kfree+0x2b8/0x6d0 mm/slub.c:6837
sta_info_insert_finish net/mac80211/sta_info.c:966 [inline]
sta_info_insert_rcu+0x1ddb/0x3070 net/mac80211/sta_info.c:1009
ieee80211_ibss_finish_sta+0x21f/0x3b0 net/mac80211/ibss.c:568
ieee80211_ibss_add_sta+0x3a8/0x730 net/mac80211/ibss.c:624
ieee80211_update_sta_info net/mac80211/ibss.c:1000 [inline]
ieee80211_rx_bss_info net/mac80211/ibss.c:1092 [inline]
ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1573 [inline]
ieee80211_ibss_rx_queued_mgmt+0x2767/0x2fe0 net/mac80211/ibss.c:1600
ieee80211_iface_process_skb net/mac80211/iface.c:1694 [inline]
ieee80211_iface_work+0xe2e/0x1360 net/mac80211/iface.c:1748
cfg80211_wiphy_work+0x2c7/0x580 net/wireless/core.c:435
process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3263
process_scheduled_works kernel/workqueue.c:3346 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3427
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
The buggy address belongs to the object at ffff888057a9fc00
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 [ffff888057a9fc00, ffff888057a9fe00)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x57a9c
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 ffff88813ffa6c80 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88813ffa6c80 dead000000000100 dead000000000122
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea00015ea701 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 5827, tgid 5827 (syz-executor), ts 110951483323, free_ts 37395076814
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1850
prep_new_page mm/page_alloc.c:1858 [inline]
get_page_from_freelist+0x10a3/0x3a30 mm/page_alloc.c:3884
__alloc_frozen_pages_noprof+0x25f/0x2470 mm/page_alloc.c:5183
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
alloc_slab_page mm/slub.c:3055 [inline]
allocate_slab mm/slub.c:3228 [inline]
new_slab+0x24a/0x360 mm/slub.c:3282
___slab_alloc+0xdae/0x1a60 mm/slub.c:4651
__slab_alloc.constprop.0+0x63/0x110 mm/slub.c:4770
__slab_alloc_node mm/slub.c:4846 [inline]
slab_alloc_node mm/slub.c:5268 [inline]
__do_kmalloc_node mm/slub.c:5641 [inline]
__kmalloc_noprof+0x501/0x880 mm/slub.c:5654
kmalloc_noprof include/linux/slab.h:961 [inline]
kzalloc_noprof include/linux/slab.h:1094 [inline]
fib6_info_alloc+0x40/0x160 net/ipv6/ip6_fib.c:155
ip6_route_info_create+0x14c/0x870 net/ipv6/route.c:3809
addrconf_f6i_alloc+0x2da/0x660 net/ipv6/route.c:4678
ipv6_add_addr+0x531/0x1fe0 net/ipv6/addrconf.c:1126
addrconf_add_linklocal+0x2a5/0x500 net/ipv6/addrconf.c:3311
addrconf_addr_gen+0x364/0x3b0 net/ipv6/addrconf.c:3442
addrconf_dev_config net/ipv6/addrconf.c:3489 [inline]
addrconf_init_auto_addrs+0x2ba/0x810 net/ipv6/addrconf.c:3567
addrconf_notify+0xe93/0x19e0 net/ipv6/addrconf.c:3740
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+0x7df/0x1160 mm/page_alloc.c:2906
__free_pages mm/page_alloc.c:5302 [inline]
free_contig_range+0x183/0x4b0 mm/page_alloc.c:7146
destroy_args+0xb69/0x12e0 mm/debug_vm_pgtable.c:958
debug_vm_pgtable+0x1a32/0x3640 mm/debug_vm_pgtable.c:1345
do_one_initcall+0x123/0x6e0 init/main.c:1283
do_initcall_level init/main.c:1345 [inline]
do_initcalls init/main.c:1361 [inline]
do_basic_setup init/main.c:1380 [inline]
kernel_init_freeable+0x5c8/0x920 init/main.c:1593
kernel_init+0x1c/0x2b0 init/main.c:1483
ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Memory state around the buggy address:
ffff888057a9fe80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888057a9ff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888057a9ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff888057aa0000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff888057aa0080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess), 2 bytes skipped:
0: 00 00 add %al,(%rax)
2: 44 8b 05 19 37 f8 0e mov 0xef83719(%rip),%r8d # 0xef83722
9: 45 85 c0 test %r8d,%r8d
c: 0f 85 be 01 00 00 jne 0x1d0
12: 4c 89 e7 mov %r12,%rdi
15: e8 a4 f6 ff ff call 0xfffff6be
1a: e8 7f d3 3a 00 call 0x3ad39e
1f: fb sti
20: 65 48 8b 1d de 37 17 mov %gs:0x121737de(%rip),%rbx # 0x12173806
27: 12
* 28: 48 8d bb 58 16 00 00 lea 0x1658(%rbx),%rdi <-- trapping instruction
2f: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
36: fc ff df
39: 48 89 fa mov %rdi,%rdx
3c: 48 rex.W
3d: c1 .byte 0xc1