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BUG: KASAN: slab-out-of-bounds in dns_resolver_preparse+0xca9/0xd70 net/dns_resolver/dns_key.c:127
Read of size 1 at addr ffff888018eeecd4 by task syz-executor.0/12223

CPU: 0 PID: 12223 Comm: syz-executor.0 Not tainted 6.7.0-rc6-syzkaller-00303-g3f82f1c3a036 #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+0xd9/0x1b0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0xc4/0x620 mm/kasan/report.c:475
 kasan_report+0xda/0x110 mm/kasan/report.c:588
 dns_resolver_preparse+0xca9/0xd70 net/dns_resolver/dns_key.c:127
 __key_create_or_update+0x454/0xe00 security/keys/key.c:842
 key_create_or_update+0x42/0x50 security/keys/key.c:1007
 __do_sys_add_key+0x29c/0x450 security/keys/keyctl.c:134
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f379647cce9
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:00007f37971b70c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000f8
RAX: ffffffffffffffda RBX: 00007f379659bf80 RCX: 00007f379647cce9
RDX: 0000000020000080 RSI: 0000000000000000 RDI: 00000000200003c0
RBP: 00007f37964c947a R08: 0000000003a8c9f8 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f379659bf80 R15: 00007ffd67481348
 </TASK>

Allocated by task 12223:
 kasan_save_stack+0x33/0x50 mm/kasan/common.c:45
 kasan_set_track+0x25/0x30 mm/kasan/common.c:52
 ____kasan_kmalloc mm/kasan/common.c:374 [inline]
 __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:383
 kasan_kmalloc include/linux/kasan.h:198 [inline]
 __do_kmalloc_node mm/slab_common.c:1007 [inline]
 __kmalloc_node+0x5c/0x90 mm/slab_common.c:1014
 kmalloc_node include/linux/slab.h:620 [inline]
 kvmalloc_node+0x99/0x1a0 mm/util.c:617
 kvmalloc include/linux/slab.h:738 [inline]
 __do_sys_add_key+0x1f8/0x450 security/keys/keyctl.c:116
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

The buggy address belongs to the object at ffff888018eeecd0
 which belongs to the cache kmalloc-8 of size 8
The buggy address is located 0 bytes to the right of
 allocated 4-byte region [ffff888018eeecd0, ffff888018eeecd4)

The buggy address belongs to the physical page:
page:ffffea000063bb80 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888018eeec58 pfn:0x18eee
flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000800 ffff888013041280 ffffea00008268c0 dead000000000002
raw: ffff888018eeec58 0000000080660063 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, tgid 1 (swapper/0), ts 2838134013, free_ts 0
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x2d0/0x350 mm/page_alloc.c:1537
 prep_new_page mm/page_alloc.c:1544 [inline]
 get_page_from_freelist+0xa25/0x36d0 mm/page_alloc.c:3312
 __alloc_pages+0x22e/0x2420 mm/page_alloc.c:4568
 alloc_pages_mpol+0x258/0x5f0 mm/mempolicy.c:2133
 alloc_slab_page mm/slub.c:1870 [inline]
 allocate_slab mm/slub.c:2017 [inline]
 new_slab+0x283/0x3c0 mm/slub.c:2070
 ___slab_alloc+0x979/0x1500 mm/slub.c:3223
 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3322
 __slab_alloc_node mm/slub.c:3375 [inline]
 slab_alloc_node mm/slub.c:3468 [inline]
 __kmem_cache_alloc_node+0x131/0x310 mm/slub.c:3517
 __do_kmalloc_node mm/slab_common.c:1006 [inline]
 __kmalloc+0x49/0x90 mm/slab_common.c:1020
 kmalloc include/linux/slab.h:604 [inline]
 kzalloc include/linux/slab.h:721 [inline]
 acpi_os_allocate_zeroed include/acpi/platform/aclinuxex.h:57 [inline]
 acpi_ns_internalize_name+0x149/0x220 drivers/acpi/acpica/nsutils.c:331
 acpi_ns_get_node_unlocked+0x164/0x310 drivers/acpi/acpica/nsutils.c:666
 acpi_ns_get_node+0x4c/0x70 drivers/acpi/acpica/nsutils.c:726
 acpi_get_handle+0x106/0x270 drivers/acpi/acpica/nsxfname.c:98
 acpi_has_method+0x7b/0xb0 drivers/acpi/utils.c:647
 acpi_is_ioapic drivers/acpi/ioapic.c:75 [inline]
 handle_ioapic_add+0x9e/0xc50 drivers/acpi/ioapic.c:107
 acpi_ns_walk_namespace+0x3fe/0x5a0 drivers/acpi/acpica/nswalk.c:233
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888018eeeb80: fc fc fa fc fc fc fc fa fc fc fc fc fa fc fc fc
 ffff888018eeec00: fc fa fc fc fc fc fa fc fc fc fc fb fc fc fc fc
>ffff888018eeec80: fb fc fc fc fc fa fc fc fc fc 04 fc fc fc fc fa
                                                 ^
 ffff888018eeed00: fc fc fc fc fb fc fc fc fc fa fc fc fc fc fa fc
 ffff888018eeed80: fc fc fc fa fc fc fc fc 00 fc fc fc fc 00 fc fc
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