==================================================================
BUG: KASAN: slab-out-of-bounds in kobject_get+0x113/0x120 lib/kobject.c:631
Read of size 1 at addr ffff88810910103c by task syz.8.383/1824

CPU: 0 PID: 1824 Comm: syz.8.383 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x24 lib/dump_stack.c:88
 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
 print_address_description+0x71/0x200 mm/kasan/report.c:316
 print_report+0x4a/0x60 mm/kasan/report.c:420
 kasan_report+0x122/0x150 mm/kasan/report.c:524
 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:348
 kobject_get+0x113/0x120 lib/kobject.c:631
 get_device drivers/base/core.c:3794 [inline]
 device_add+0x2f0/0xec0 drivers/base/core.c:3618
 device_create_groups_vargs drivers/base/core.c:4392 [inline]
 device_create+0x26c/0x300 drivers/base/core.c:4434
 create_function_device+0x60/0x70 drivers/usb/gadget/configfs.c:36
 create_alsa_device drivers/usb/gadget/function/f_midi.c:1306 [inline]
 f_midi_alloc_inst+0x1a8/0x380 drivers/usb/gadget/function/f_midi.c:1347
 try_get_usb_function_instance drivers/usb/gadget/functions.c:28 [inline]
 usb_get_function_instance+0xf3/0x310 drivers/usb/gadget/functions.c:44
 function_make+0x118/0x360 drivers/usb/gadget/configfs.c:652
 configfs_mkdir+0x518/0x9e0 fs/configfs/dir.c:1329
 vfs_mkdir+0x39c/0x580 fs/namei.c:4113
 do_mkdirat+0x174/0x4d0 fs/namei.c:4138
 __do_sys_mkdir fs/namei.c:4158 [inline]
 __se_sys_mkdir fs/namei.c:4156 [inline]
 __x64_sys_mkdir+0x6e/0x80 fs/namei.c:4156
 x64_sys_call+0x966/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:84
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f2ee0b9de99
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f2ee1a90028 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007f2ee0e25fa0 RCX: 00007f2ee0b9de99
RDX: 0000000000000000 RSI: 00000000000001ff RDI: 0000200000000800
RBP: 00007f2ee0c33eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2ee0e26038 R14: 00007f2ee0e25fa0 R15: 00007fff402b3288
 </TASK>

Allocated by task 102:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:505
 __kasan_slab_alloc+0x72/0x80 mm/kasan/common.c:334
 kasan_slab_alloc include/linux/kasan.h:202 [inline]
 slab_post_alloc_hook+0x4f/0x2d0 mm/slab.h:768
 slab_alloc_node mm/slub.c:3382 [inline]
 slab_alloc mm/slub.c:3392 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3399 [inline]
 kmem_cache_alloc+0x166/0x320 mm/slub.c:3408
 getname_flags+0xba/0x510 fs/namei.c:139
 getname+0x19/0x20 fs/namei.c:218
 do_sys_openat2+0xeb/0x820 fs/open.c:1337
 do_sys_open fs/open.c:1359 [inline]
 __do_sys_openat fs/open.c:1375 [inline]
 __se_sys_openat fs/open.c:1370 [inline]
 __x64_sys_openat+0x136/0x160 fs/open.c:1370
 x64_sys_call+0x783/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Freed by task 102:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:516
 ____kasan_slab_free+0x132/0x180 mm/kasan/common.c:242
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:250
 kasan_slab_free include/linux/kasan.h:178 [inline]
 slab_free_hook mm/slub.c:1750 [inline]
 slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1776
 slab_free mm/slub.c:3712 [inline]
 kmem_cache_free+0x12d/0x300 mm/slub.c:3737
 putname+0x111/0x160 fs/namei.c:272
 do_sys_openat2+0x715/0x820 fs/open.c:1352
 do_sys_open fs/open.c:1359 [inline]
 __do_sys_openat fs/open.c:1375 [inline]
 __se_sys_openat fs/open.c:1370 [inline]
 __x64_sys_openat+0x136/0x160 fs/open.c:1370
 x64_sys_call+0x783/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

The buggy address belongs to the object at ffff888109100000
 which belongs to the cache names_cache of size 4096
The buggy address is located 60 bytes to the right of
 4096-byte region [ffff888109100000, ffff888109101000)

The buggy address belongs to the physical page:
page:ffffea0004244000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x109100
head:ffffea0004244000 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 0000000000000000 dead000000000122 ffff8881001ed200
raw: 0000000000000000 0000000000070007 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 308, tgid 308 (udevd), ts 78685692418, free_ts 78639153603
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2672
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2679
 get_page_from_freelist+0x2ca9/0x2d20 mm/page_alloc.c:4586
 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5930
 alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1
 allocate_slab mm/slub.c:1967 [inline]
 new_slab+0x98/0x3e0 mm/slub.c:2020
 ___slab_alloc+0x70f/0xb70 mm/slub.c:3177
 __slab_alloc+0x5e/0xa0 mm/slub.c:3263
 slab_alloc_node mm/slub.c:3348 [inline]
 slab_alloc mm/slub.c:3392 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3399 [inline]
 kmem_cache_alloc+0x1a8/0x320 mm/slub.c:3408
 getname_flags+0xba/0x510 fs/namei.c:139
 getname+0x19/0x20 fs/namei.c:218
 do_sys_openat2+0xeb/0x820 fs/open.c:1337
 do_sys_open fs/open.c:1359 [inline]
 __do_sys_openat fs/open.c:1375 [inline]
 __se_sys_openat fs/open.c:1370 [inline]
 __x64_sys_openat+0x136/0x160 fs/open.c:1370
 x64_sys_call+0x783/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 free_pages_prepare mm/page_alloc.c:1580 [inline]
 free_pcp_prepare mm/page_alloc.c:1654 [inline]
 free_unref_page_prepare+0x80c/0x820 mm/page_alloc.c:3621
 free_unref_page+0x93/0x530 mm/page_alloc.c:3719
 free_the_page mm/page_alloc.c:863 [inline]
 __free_pages+0x67/0x100 mm/page_alloc.c:6020
 __free_slab+0xc7/0x1a0 mm/slub.c:2044
 free_slab mm/slub.c:2059 [inline]
 discard_slab mm/slub.c:2065 [inline]
 __unfreeze_partials+0x15a/0x190 mm/slub.c:2614
 put_cpu_partial+0xa9/0x100 mm/slub.c:2690
 __slab_free+0x1c4/0x280 mm/slub.c:3589
 do_slab_free mm/slub.c:3666 [inline]
 ___cache_free+0xbf/0xd0 mm/slub.c:3722
 qlink_free mm/kasan/quarantine.c:168 [inline]
 qlist_free_all+0xc6/0x140 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x14a/0x170 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x24/0x80 mm/kasan/common.c:311
 kasan_slab_alloc include/linux/kasan.h:202 [inline]
 slab_post_alloc_hook+0x4f/0x2d0 mm/slab.h:768
 slab_alloc_node mm/slub.c:3382 [inline]
 slab_alloc mm/slub.c:3392 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3399 [inline]
 kmem_cache_alloc+0x166/0x320 mm/slub.c:3408
 getname_flags+0xba/0x510 fs/namei.c:139
 getname+0x19/0x20 fs/namei.c:218
 do_sys_openat2+0xeb/0x820 fs/open.c:1337

Memory state around the buggy address:
 ffff888109100f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888109100f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888109101000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                        ^
 ffff888109101080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888109101100: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
------------[ cut here ]------------
general protection fault, probably for non-canonical address 0xe0be5c1de000000c: 0000 [#1] PREEMPT SMP KASAN
KASAN: maybe wild-memory-access in range [0x05f300ef00000060-0x05f300ef00000067]
CPU: 0 PID: 1824 Comm: syz.8.383 Tainted: G    B              syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:string_nocheck lib/vsprintf.c:643 [inline]
RIP: 0010:string+0x19d/0x2a0 lib/vsprintf.c:725
Code: da 00 00 00 48 89 5d d0 4c 89 7d c0 4c 89 fb 48 ff cb 45 31 ed 4b 8d 3c 2c 48 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 75 5c 4d 01 ee 47 0f b6 3c 2c 31 ff 44 89 fe e8
RSP: 0018:ffffc9000dc5f568 EFLAGS: 00010007
RAX: 00be601de000000c RBX: fffffffffffffffe RCX: dffffc0000000000
RDX: 0000000000000002 RSI: ffffffffffffffff RDI: 05f300ef00000066
RBP: ffffc9000dc5f5b0 R08: ffff88812d5cbcc0 R09: 0000000000000012
R10: 0000000000000012 R11: 0000000000000002 R12: 05f300ef00000066
R13: 0000000000000000 R14: ffffc9000dc5f78c R15: ffffffffffffffff
FS:  00007f2ee1a906c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2ee1a6fd58 CR3: 0000000127764000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 vsnprintf+0xec5/0x1990 lib/vsprintf.c:2805
 vprintk_store+0x3ad/0xdf0 kernel/printk/printk.c:2191
 vprintk_emit+0x102/0x420 kernel/printk/printk.c:2289
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2323
 vprintk+0x7a/0x80 kernel/printk/printk_safe.c:45
 __warn_printk+0x274/0x360 kernel/panic.c:726
 kobject_get+0x7c/0x120 lib/kobject.c:632
 get_device drivers/base/core.c:3794 [inline]
 device_add+0x2f0/0xec0 drivers/base/core.c:3618
 device_create_groups_vargs drivers/base/core.c:4392 [inline]
 device_create+0x26c/0x300 drivers/base/core.c:4434
 create_function_device+0x60/0x70 drivers/usb/gadget/configfs.c:36
 create_alsa_device drivers/usb/gadget/function/f_midi.c:1306 [inline]
 f_midi_alloc_inst+0x1a8/0x380 drivers/usb/gadget/function/f_midi.c:1347
 try_get_usb_function_instance drivers/usb/gadget/functions.c:28 [inline]
 usb_get_function_instance+0xf3/0x310 drivers/usb/gadget/functions.c:44
 function_make+0x118/0x360 drivers/usb/gadget/configfs.c:652
 configfs_mkdir+0x518/0x9e0 fs/configfs/dir.c:1329
 vfs_mkdir+0x39c/0x580 fs/namei.c:4113
 do_mkdirat+0x174/0x4d0 fs/namei.c:4138
 __do_sys_mkdir fs/namei.c:4158 [inline]
 __se_sys_mkdir fs/namei.c:4156 [inline]
 __x64_sys_mkdir+0x6e/0x80 fs/namei.c:4156
 x64_sys_call+0x966/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:84
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f2ee0b9de99
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f2ee1a90028 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007f2ee0e25fa0 RCX: 00007f2ee0b9de99
RDX: 0000000000000000 RSI: 00000000000001ff RDI: 0000200000000800
RBP: 00007f2ee0c33eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2ee0e26038 R14: 00007f2ee0e25fa0 R15: 00007fff402b3288
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:string_nocheck lib/vsprintf.c:643 [inline]
RIP: 0010:string+0x19d/0x2a0 lib/vsprintf.c:725
Code: da 00 00 00 48 89 5d d0 4c 89 7d c0 4c 89 fb 48 ff cb 45 31 ed 4b 8d 3c 2c 48 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 75 5c 4d 01 ee 47 0f b6 3c 2c 31 ff 44 89 fe e8
RSP: 0018:ffffc9000dc5f568 EFLAGS: 00010007
RAX: 00be601de000000c RBX: fffffffffffffffe RCX: dffffc0000000000
RDX: 0000000000000002 RSI: ffffffffffffffff RDI: 05f300ef00000066
RBP: ffffc9000dc5f5b0 R08: ffff88812d5cbcc0 R09: 0000000000000012
R10: 0000000000000012 R11: 0000000000000002 R12: 05f300ef00000066
R13: 0000000000000000 R14: ffffc9000dc5f78c R15: ffffffffffffffff
FS:  00007f2ee1a906c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2ee1a6fd58 CR3: 0000000127764000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	da 00                	fiaddl (%rax)
   2:	00 00                	add    %al,(%rax)
   4:	48 89 5d d0          	mov    %rbx,-0x30(%rbp)
   8:	4c 89 7d c0          	mov    %r15,-0x40(%rbp)
   c:	4c 89 fb             	mov    %r15,%rbx
   f:	48 ff cb             	dec    %rbx
  12:	45 31 ed             	xor    %r13d,%r13d
  15:	4b 8d 3c 2c          	lea    (%r12,%r13,1),%rdi
  19:	48 89 f8             	mov    %rdi,%rax
  1c:	48 c1 e8 03          	shr    $0x3,%rax
  20:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  27:	fc ff df
* 2a:	0f b6 04 08          	movzbl (%rax,%rcx,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	75 5c                	jne    0x8e
  32:	4d 01 ee             	add    %r13,%r14
  35:	47 0f b6 3c 2c       	movzbl (%r12,%r13,1),%r15d
  3a:	31 ff                	xor    %edi,%edi
  3c:	44 89 fe             	mov    %r15d,%esi
  3f:	e8                   	.byte 0xe8