==================================================================
BUG: KASAN: slab-use-after-free in __list_del_entry_valid_or_report+0x31/0x190 lib/list_debug.c:49
Read of size 8 at addr ffff888029ea2c58 by task syz.4.88/6472

CPU: 0 UID: 0 PID: 6472 Comm: syz.4.88 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description+0x55/0x1e0 mm/kasan/report.c:378
 print_report+0x58/0x70 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 __list_del_entry_valid_or_report+0x31/0x190 lib/list_debug.c:49
 __list_del_entry_valid include/linux/list.h:140 [inline]
 __list_del_entry include/linux/list.h:261 [inline]
 list_del include/linux/list.h:275 [inline]
 uvcg_extension_drop+0x81/0x1f0 drivers/usb/gadget/function/uvc_configfs.c:1260
 configfs_mkdir+0x7e9/0x9e0 fs/configfs/dir.c:1443
 vfs_mkdir+0x408/0x620 fs/namei.c:5410
 filename_mkdirat+0x289/0x520 fs/namei.c:5443
 __do_sys_mkdirat fs/namei.c:5464 [inline]
 __se_sys_mkdirat+0x35/0x150 fs/namei.c:5461
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa93842e159
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:00007fa936686028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007fa9386b5fa0 RCX: 00007fa93842e159
RDX: 00000000000001ff RSI: 00002000000001c0 RDI: ffffffffffffff9c
RBP: 00007fa9384c5024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa9386b6038 R14: 00007fa9386b5fa0 R15: 00007ffcc4103468
 </TASK>

Allocated by task 6472:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __kmalloc_cache_noprof+0x3d5/0x680 mm/slub.c:5563
 _kmalloc_noprof include/linux/slab.h:991 [inline]
 _kzalloc_noprof include/linux/slab.h:1312 [inline]
 uvcg_extension_make+0x95/0x300 drivers/usb/gadget/function/uvc_configfs.c:1276
 configfs_mkdir+0x580/0x9e0 fs/configfs/dir.c:1369
 vfs_mkdir+0x408/0x620 fs/namei.c:5410
 filename_mkdirat+0x289/0x520 fs/namei.c:5443
 __do_sys_mkdirat fs/namei.c:5464 [inline]
 __se_sys_mkdirat+0x35/0x150 fs/namei.c:5461
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 6472:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:253 [inline]
 __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2748 [inline]
 slab_free mm/slub.c:6499 [inline]
 kfree+0x1c5/0x6d0 mm/slub.c:6792
 config_item_cleanup fs/configfs/item.c:128 [inline]
 config_item_release+0x13a/0x2d0 fs/configfs/item.c:137
 uvcg_extension_drop+0x75/0x1f0 drivers/usb/gadget/function/uvc_configfs.c:1259
 configfs_mkdir+0x7e9/0x9e0 fs/configfs/dir.c:1443
 vfs_mkdir+0x408/0x620 fs/namei.c:5410
 filename_mkdirat+0x289/0x520 fs/namei.c:5443
 __do_sys_mkdirat fs/namei.c:5464 [inline]
 __se_sys_mkdirat+0x35/0x150 fs/namei.c:5461
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888029ea2c00
 which belongs to the cache kmalloc-192 of size 192
The buggy address is located 88 bytes inside of
 freed 192-byte region [ffff888029ea2c00, ffff888029ea2cc0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x29ea2
flags: 0x80000000000000(node=0|zone=1)
page_type: f5(slab)
raw: 0080000000000000 ffff88813ffbb3c0 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 6151, tgid 6151 (syz-executor), ts 142531298017
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1871
 prep_new_page mm/page_alloc.c:1879 [inline]
 get_page_from_freelist+0x2591/0x2600 mm/page_alloc.c:3943
 __alloc_frozen_pages_noprof+0x230/0x5c0 mm/page_alloc.c:5436
 alloc_slab_page mm/slub.c:3347 [inline]
 allocate_slab+0x7d/0x620 mm/slub.c:3462
 new_slab mm/slub.c:3513 [inline]
 refill_objects+0x2d8/0x350 mm/slub.c:7410
 refill_sheaf mm/slub.c:2885 [inline]
 __pcs_replace_empty_main+0x339/0x690 mm/slub.c:4774
 alloc_from_pcs mm/slub.c:4850 [inline]
 slab_alloc_node mm/slub.c:4984 [inline]
 __do_kmalloc_node mm/slub.c:5413 [inline]
 __kmalloc_noprof+0x54b/0x790 mm/slub.c:5439
 _kmalloc_noprof include/linux/slab.h:995 [inline]
 _kzalloc_noprof include/linux/slab.h:1312 [inline]
 new_dir fs/proc/proc_sysctl.c:965 [inline]
 get_subdir fs/proc/proc_sysctl.c:1009 [inline]
 sysctl_mkdir_p fs/proc/proc_sysctl.c:1319 [inline]
 __register_sysctl_table+0xc02/0x1370 fs/proc/proc_sysctl.c:1394
 mpls_dev_sysctl_register+0x196/0x280 net/mpls/af_mpls.c:1453
 mpls_add_dev net/mpls/af_mpls.c:1506 [inline]
 mpls_dev_notify+0x3b7/0xd30 net/mpls/af_mpls.c:1651
 notifier_call_chain+0x1a5/0x3d0 kernel/notifier.c:85
 call_netdevice_notifiers_extack net/core/dev.c:2313 [inline]
 call_netdevice_notifiers net/core/dev.c:2327 [inline]
 register_netdevice+0x18c0/0x1ed0 net/core/dev.c:11541
 team_newlink+0x120/0x170 drivers/net/team/team_core.c:2408
 rtnl_newlink_create+0x305/0x7b0 net/core/rtnetlink.c:3969
 __rtnl_newlink net/core/rtnetlink.c:4098 [inline]
 rtnl_newlink+0x166d/0x1c30 net/core/rtnetlink.c:4215
 rtnetlink_rcv_msg+0x802/0xc00 net/core/rtnetlink.c:7132
page last free pid 6248 tgid 6243 ts 138243024990 stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 __free_pages_prepare mm/page_alloc.c:1418 [inline]
 __free_frozen_pages+0xf8e/0x1070 mm/page_alloc.c:2962
 __slab_free+0x250/0x2a0 mm/slub.c:5815
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
 __kasan_kmalloc+0x22/0xb0 mm/kasan/common.c:406
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5414 [inline]
 __kmalloc_node_track_caller_noprof+0x56e/0x7b0 mm/slub.c:5545
 kvasprintf+0xeb/0x1a0 lib/kasprintf.c:25
 kasprintf+0xe2/0x140 lib/kasprintf.c:59
 shmem_initxattrs+0x2f4/0x530 mm/shmem.c:4229
 security_inode_init_security+0x29b/0x3e0 security/security.c:1370
 shmem_mknod+0x1ea/0x340 mm/shmem.c:3838
 shmem_mkdir+0x33/0x70 mm/shmem.c:3893
 vfs_mkdir+0x408/0x620 fs/namei.c:5410
 filename_mkdirat+0x289/0x520 fs/namei.c:5443
 __do_sys_mkdirat fs/namei.c:5464 [inline]
 __se_sys_mkdirat+0x35/0x150 fs/namei.c:5461
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84

Memory state around the buggy address:
 ffff888029ea2b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888029ea2b80: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888029ea2c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                    ^
 ffff888029ea2c80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff888029ea2d00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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