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BUG: KASAN: slab-out-of-bounds in dns_resolver_preparse+0xcaf/0xd20 net/dns_resolver/dns_key.c:127
Read of size 1 at addr ffff88801f5a170c by task syz-executor.0/4160

CPU: 0 PID: 4160 Comm: syz-executor.0 Not tainted 5.15.146-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 print_address_description+0x63/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0x16b/0x1c0 mm/kasan/report.c:451
 dns_resolver_preparse+0xcaf/0xd20 net/dns_resolver/dns_key.c:127
 key_create_or_update+0x47b/0xbf0 security/keys/key.c:861
 __do_sys_add_key security/keys/keyctl.c:134 [inline]
 __se_sys_add_key+0x33b/0x480 security/keys/keyctl.c:74
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fbfd280ed29
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbfd0d900c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000f8
RAX: ffffffffffffffda RBX: 00007fbfd293df80 RCX: 00007fbfd280ed29
RDX: 0000000020000340 RSI: 0000000020000400 RDI: 00000000200003c0
RBP: 00007fbfd285b47a R08: 000000001ced853a R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fbfd293df80 R15: 00007fff38831728
 </TASK>

Allocated by task 4160:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 ____kasan_kmalloc+0xba/0xf0 mm/kasan/common.c:513
 kasan_kmalloc include/linux/kasan.h:264 [inline]
 __kmalloc_node+0x199/0x390 mm/slub.c:4455
 kmalloc_node include/linux/slab.h:614 [inline]
 kvmalloc_node+0x80/0x140 mm/util.c:619
 kvmalloc include/linux/mm.h:805 [inline]
 __do_sys_add_key security/keys/keyctl.c:116 [inline]
 __se_sys_add_key+0x26c/0x480 security/keys/keyctl.c:74
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

The buggy address belongs to the object at ffff88801f5a1708
 which belongs to the cache kmalloc-8 of size 8
The buggy address is located 4 bytes inside of
 8-byte region [ffff88801f5a1708, ffff88801f5a1710)
The buggy address belongs to the page:
page:ffffea00007d6840 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88801f5a1d70 pfn:0x1f5a1
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffffea0000526dc0 0000000a0000000a ffff888011c41280
raw: ffff88801f5a1d70 0000000080660062 00000001ffffffff 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, ts 9742713040, free_ts 0
 prep_new_page mm/page_alloc.c:2426 [inline]
 get_page_from_freelist+0x322a/0x33c0 mm/page_alloc.c:4159
 __alloc_pages+0x272/0x700 mm/page_alloc.c:5421
 alloc_page_interleave+0x22/0x1c0 mm/mempolicy.c:2031
 alloc_slab_page mm/slub.c:1775 [inline]
 allocate_slab mm/slub.c:1912 [inline]
 new_slab+0xbb/0x4b0 mm/slub.c:1975
 ___slab_alloc+0x6f6/0xe10 mm/slub.c:3008
 __slab_alloc mm/slub.c:3095 [inline]
 slab_alloc_node mm/slub.c:3186 [inline]
 slab_alloc mm/slub.c:3228 [inline]
 __kmalloc_track_caller+0x1c7/0x300 mm/slub.c:4925
 kstrdup mm/util.c:60 [inline]
 kstrdup_const+0x51/0x90 mm/util.c:83
 __kernfs_new_node+0x99/0x750 fs/kernfs/dir.c:589
 kernfs_new_node fs/kernfs/dir.c:657 [inline]
 kernfs_create_dir_ns+0x90/0x230 fs/kernfs/dir.c:993
 sysfs_create_dir_ns+0x185/0x390 fs/sysfs/dir.c:59
 create_dir lib/kobject.c:89 [inline]
 kobject_add_internal+0x6e0/0xe00 lib/kobject.c:263
 kobject_add_varg lib/kobject.c:398 [inline]
 kobject_add+0x14e/0x210 lib/kobject.c:450
 device_add+0x476/0xfd0 drivers/base/core.c:3329
 usb_create_ep_devs+0x12c/0x220 drivers/usb/core/endpoint.c:169
 usb_new_device+0xd0a/0x18d0 drivers/usb/core/hub.c:2604
 register_root_hub+0x25f/0x540 drivers/usb/core/hcd.c:1021
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88801f5a1600: fc fc fc 05 fc fc fc fc 05 fc fc fc fc 05 fc fc
 ffff88801f5a1680: fc fc 05 fc fc fc fc 06 fc fc fc fc 06 fc fc fc
>ffff88801f5a1700: fc 04 fc fc fc fc fb fc fc fc fc 05 fc fc fc fc
                      ^
 ffff88801f5a1780: 05 fc fc fc fc fa fc fc fc fc fa fc fc fc fc 05
 ffff88801f5a1800: fc fc fc fc 05 fc fc fc fc 07 fc fc fc fc 06 fc
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