==================================================================
BUG: KASAN: slab-out-of-bounds in mcp2221_raw_event+0xf94/0x1030 drivers/hid/hid-mcp2221.c:944
Read of size 1 at addr ffff888107b2ffff by task kworker/0:3/9508
CPU: 0 UID: 0 PID: 9508 Comm: kworker/0:3 Not tainted syzkaller #0 PREEMPT(voluntary)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: events legacy_dvb_usb_read_remote_control
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:console_flush_all+0x9a2/0xc60 kernel/printk/printk.c:3227
Code: 00 e8 92 86 28 00 9c 5b 81 e3 00 02 00 00 31 ff 48 89 de e8 b0 a6 20 00 48 85 db 0f 85 55 01 00 00 e8 32 ab 20 00 fb 4c 89 e0 <48> c1 e8 03 42 80 3c 38 00 0f 84 11 ff ff ff 4c 89 e7 e8 97 d9 7e
RSP: 0018:ffffc90011eef818 EFLAGS: 00000293
RAX: ffffffff897db338 RBX: 0000000000000000 RCX: ffffffff815d4d10
RDX: ffff8881151c5700 RSI: ffffffff815d4d1e RDI: 0000000000000007
RBP: 0000000000000001 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff897db338
R13: ffffffff897db2e0 R14: ffffc90011eef8a8 R15: dffffc0000000000
__console_flush_and_unlock kernel/printk/printk.c:3285 [inline]
console_unlock+0xd8/0x210 kernel/printk/printk.c:3325
vprintk_emit+0x418/0x6d0 kernel/printk/printk.c:2450
_printk+0xc7/0x100 kernel/printk/printk.c:2475
m920x_read drivers/media/usb/dvb-usb/m920x.c:40 [inline]
m920x_rc_query+0x496/0x770 drivers/media/usb/dvb-usb/m920x.c:193
legacy_dvb_usb_read_remote_control+0x10c/0x4f0 drivers/media/usb/dvb-usb/dvb-usb-remote.c:123
process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3236
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x5b6/0x6c0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Allocated by task 2835:
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
kmalloc_noprof include/linux/slab.h:905 [inline]
syslog_print+0xf6/0x620 kernel/printk/printk.c:1607
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
Freed by task 2835:
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
syslog_print+0x546/0x620 kernel/printk/printk.c:1699
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
The buggy address belongs to the object at ffff888107b2f000
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 2047 bytes to the right of
allocated 2048-byte region [ffff888107b2f000, ffff888107b2f800)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x107b28
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x200000000000040(head|node=0|zone=2)
page_type: f5(slab)
raw: 0200000000000040 ffff888100042000 ffffea0004cbd200 dead000000000002
raw: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000
head: 0200000000000040 ffff888100042000 ffffea0004cbd200 dead000000000002
head: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000
head: 0200000000000003 ffffea00041eca01 00000000ffffffff 00000000ffffffff
head: 0000000000000000 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 2835, tgid 2835 (klogd), ts 135699347850, free_ts 135511717173
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]
__kmalloc_cache_noprof+0x209/0x3c0 mm/slub.c:4391
kmalloc_noprof include/linux/slab.h:905 [inline]
syslog_print+0xf6/0x620 kernel/printk/printk.c:1607
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
page last free pid 5415 tgid 5414 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]
__do_kmalloc_node mm/slub.c:4364 [inline]
__kmalloc_node_track_caller_noprof+0x1c4/0x4c0 mm/slub.c:4384
memdup_user+0x2a/0xe0 mm/util.c:221
raw_ioctl_ep_enable drivers/usb/gadget/legacy/raw_gadget.c:847 [inline]
raw_ioctl+0xc1f/0x2c30 drivers/usb/gadget/legacy/raw_gadget.c:1318
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/0x4b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff888107b2fe80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888107b2ff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888107b2ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff888107b30000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff888107b30080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess):
0: 00 e8 add %ch,%al
2: 92 xchg %eax,%edx
3: 86 28 xchg %ch,(%rax)
5: 00 9c 5b 81 e3 00 02 add %bl,0x200e381(%rbx,%rbx,2)
c: 00 00 add %al,(%rax)
e: 31 ff xor %edi,%edi
10: 48 89 de mov %rbx,%rsi
13: e8 b0 a6 20 00 call 0x20a6c8
18: 48 85 db test %rbx,%rbx
1b: 0f 85 55 01 00 00 jne 0x176
21: e8 32 ab 20 00 call 0x20ab58
26: fb sti
27: 4c 89 e0 mov %r12,%rax
* 2a: 48 c1 e8 03 shr $0x3,%rax <-- trapping instruction
2e: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1)
33: 0f 84 11 ff ff ff je 0xffffff4a
39: 4c 89 e7 mov %r12,%rdi
3c: e8 .byte 0xe8
3d: 97 xchg %eax,%edi
3e: d9 .byte 0xd9
3f: 7e .byte 0x7e