==================================================================
BUG: KASAN: slab-out-of-bounds in mcp2221_raw_event+0x1070/0x10a0 drivers/hid/hid-mcp2221.c:948
Read of size 1 at addr ffff888142d0bfff by task kworker/1:4/5340
CPU: 1 UID: 0 PID: 5340 Comm: kworker/1:4 Not tainted syzkaller #0 PREEMPT(voluntary)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
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+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+0x208/0x8d0 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0xfa/0x160 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+0x90/0xb0 arch/x86/kernel/apic/apic.c:1052
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:console_flush_all+0x9a2/0xc60 kernel/printk/printk.c:3200
Code: 00 e8 f2 c2 28 00 9c 5b 81 e3 00 02 00 00 31 ff 48 89 de e8 80 c8 20 00 48 85 db 0f 85 55 01 00 00 e8 02 cd 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 f7 00 81
RSP: 0018:ffffc90004037868 EFLAGS: 00000293
RAX: ffffffff897fd038 RBX: 0000000000000000 RCX: ffffffff815d9cd0
RDX: ffff888109799d00 RSI: ffffffff815d9cde RDI: 0000000000000007
RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffffffff897fd038
R13: ffffffff897fcfe0 R14: ffffc900040378f8 R15: dffffc0000000000
__console_flush_and_unlock kernel/printk/printk.c:3258 [inline]
console_unlock+0xd8/0x210 kernel/printk/printk.c:3298
vprintk_emit+0x3d7/0x680 kernel/printk/printk.c:2423
_printk+0xc7/0x100 kernel/printk/printk.c:2448
legacy_dvb_usb_read_remote_control+0x40b/0x4f0 drivers/media/usb/dvb-usb/dvb-usb-remote.c:124
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+0x56d/0x700 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Allocated by task 5225:
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+0x8f/0xa0 mm/kasan/common.c:417
kmalloc_noprof include/linux/slab.h:957 [inline]
inode_doinit_use_xattr+0x54/0x410 security/selinux/hooks.c:1370
inode_doinit_with_dentry+0x10c8/0x12e0 security/selinux/hooks.c:1564
selinux_d_instantiate+0x26/0x30 security/selinux/hooks.c:6523
security_d_instantiate+0x58/0xc0 security/security.c:4148
d_splice_alias_ops+0x92/0x840 fs/dcache.c:2999
kernfs_iop_lookup+0x23f/0x2d0 fs/kernfs/dir.c:1251
__lookup_slow+0x251/0x460 fs/namei.c:1816
lookup_slow fs/namei.c:1833 [inline]
walk_component+0x353/0x5b0 fs/namei.c:2151
lookup_last fs/namei.c:2652 [inline]
path_lookupat+0x142/0x6d0 fs/namei.c:2676
filename_lookup+0x224/0x5f0 fs/namei.c:2705
vfs_statx+0x101/0x3f0 fs/stat.c:353
vfs_fstatat+0x7b/0xf0 fs/stat.c:375
__do_sys_newfstatat+0x97/0x120 fs/stat.c:542
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4d0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 5225:
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+0x43/0x70 mm/kasan/common.c:284
kasan_slab_free include/linux/kasan.h:234 [inline]
slab_free_hook mm/slub.c:2523 [inline]
slab_free mm/slub.c:6611 [inline]
kfree+0x288/0x670 mm/slub.c:6818
inode_doinit_use_xattr+0x1da/0x410 security/selinux/hooks.c:1394
inode_doinit_with_dentry+0x10c8/0x12e0 security/selinux/hooks.c:1564
selinux_d_instantiate+0x26/0x30 security/selinux/hooks.c:6523
security_d_instantiate+0x58/0xc0 security/security.c:4148
d_splice_alias_ops+0x92/0x840 fs/dcache.c:2999
kernfs_iop_lookup+0x23f/0x2d0 fs/kernfs/dir.c:1251
__lookup_slow+0x251/0x460 fs/namei.c:1816
lookup_slow fs/namei.c:1833 [inline]
walk_component+0x353/0x5b0 fs/namei.c:2151
lookup_last fs/namei.c:2652 [inline]
path_lookupat+0x142/0x6d0 fs/namei.c:2676
filename_lookup+0x224/0x5f0 fs/namei.c:2705
vfs_statx+0x101/0x3f0 fs/stat.c:353
vfs_fstatat+0x7b/0xf0 fs/stat.c:375
__do_sys_newfstatat+0x97/0x120 fs/stat.c:542
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4d0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff888142d0be00
which belongs to the cache kmalloc-256 of size 256
The buggy address is located 255 bytes to the right of
allocated 256-byte region [ffff888142d0be00, ffff888142d0bf00)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x142d0a
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0x200000000000040(head|node=0|zone=2)
page_type: f5(slab)
raw: 0200000000000040 ffff888100041b40 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 0200000000000040 ffff888100041b40 0000000000000000 dead000000000001
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 0200000000000001 ffffea00050b4281 00000000ffffffff 00000000ffffffff
head: 000000020000070b 0000000000000000 00000000ffffffff 0000000000000002
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 19634, tgid 19634 (fido_id), ts 1752168013843, free_ts 1752146914030
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+0x1003/0x2dc0 mm/page_alloc.c:3884
__alloc_frozen_pages_noprof+0x259/0x21f0 mm/page_alloc.c:5183
alloc_pages_mpol+0xe4/0x410 mm/mempolicy.c:2416
alloc_slab_page mm/slub.c:3039 [inline]
allocate_slab mm/slub.c:3212 [inline]
new_slab+0x24a/0x360 mm/slub.c:3266
___slab_alloc+0xdb7/0x1a70 mm/slub.c:4636
__slab_alloc.constprop.0+0x63/0x110 mm/slub.c:4755
__slab_alloc_node mm/slub.c:4831 [inline]
slab_alloc_node mm/slub.c:5253 [inline]
__kmalloc_cache_noprof+0x3c8/0x750 mm/slub.c:5743
kmalloc_noprof include/linux/slab.h:957 [inline]
inode_doinit_use_xattr+0x54/0x410 security/selinux/hooks.c:1370
inode_doinit_with_dentry+0x10c8/0x12e0 security/selinux/hooks.c:1564
selinux_d_instantiate+0x26/0x30 security/selinux/hooks.c:6523
security_d_instantiate+0x58/0xc0 security/security.c:4148
d_splice_alias_ops+0x92/0x840 fs/dcache.c:2999
kernfs_iop_lookup+0x23f/0x2d0 fs/kernfs/dir.c:1251
lookup_open.isra.0+0x4c9/0x1560 fs/namei.c:3774
open_last_lookups fs/namei.c:3895 [inline]
path_openat+0x893/0x2cb0 fs/namei.c:4131
page last free pid 19634 tgid 19634 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1394 [inline]
__free_frozen_pages+0x78f/0x1000 mm/page_alloc.c:2906
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:352
kasan_slab_alloc include/linux/kasan.h:252 [inline]
slab_post_alloc_hook mm/slub.c:4955 [inline]
slab_alloc_node mm/slub.c:5265 [inline]
kmem_cache_alloc_noprof+0x260/0x6c0 mm/slub.c:5272
mt_alloc_one lib/maple_tree.c:172 [inline]
mas_alloc_nodes lib/maple_tree.c:1108 [inline]
mas_preallocate+0xe6a/0x11f0 lib/maple_tree.c:5192
vma_iter_prealloc mm/vma.h:442 [inline]
commit_merge+0x29a/0xeb0 mm/vma.c:753
vma_expand+0x3ac/0x910 mm/vma.c:1158
vma_merge_new_range+0x361/0xbf0 mm/vma.c:1095
__mmap_region+0x85d/0x25d0 mm/vma.c:2665
mmap_region+0x1ab/0x3f0 mm/vma.c:2740
do_mmap+0xa2e/0x11f0 mm/mmap.c:558
vm_mmap_pgoff+0x201/0x390 mm/util.c:581
ksys_mmap_pgoff+0x32c/0x5c0 mm/mmap.c:604
__do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
__se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]
__x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4d0 arch/x86/entry/syscall_64.c:94
Memory state around the buggy address:
ffff888142d0be80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888142d0bf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888142d0bf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff888142d0c000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff888142d0c080: 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: f2 c2 28 00 bnd ret $0x28
6: 9c pushf
7: 5b pop %rbx
8: 81 e3 00 02 00 00 and $0x200,%ebx
e: 31 ff xor %edi,%edi
10: 48 89 de mov %rbx,%rsi
13: e8 80 c8 20 00 call 0x20c898
18: 48 85 db test %rbx,%rbx
1b: 0f 85 55 01 00 00 jne 0x176
21: e8 02 cd 20 00 call 0x20cd28
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: f7 .byte 0xf7
3e: 00 .byte 0x0
3f: 81 .byte 0x81