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BUG: KASAN: slab-out-of-bounds in dns_resolver_preparse+0xc9f/0xd60 net/dns_resolver/dns_key.c:127
Read of size 1 at addr ffff88814cf1ed64 by task syz-executor.5/9978

CPU: 0 PID: 9978 Comm: syz-executor.5 Not tainted 6.7.0-rc6-next-20231219-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+0xd9/0x1b0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0xc3/0x620 mm/kasan/report.c:488
 kasan_report+0xd9/0x110 mm/kasan/report.c:601
 dns_resolver_preparse+0xc9f/0xd60 net/dns_resolver/dns_key.c:127
 __key_create_or_update+0x453/0xdf0 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+0x62/0x6a
RIP: 0033:0x7f2a7467cbe9
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:00007f2a753b60c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000f8
RAX: ffffffffffffffda RBX: 00007f2a7479c1f0 RCX: 00007f2a7467cbe9
RDX: 0000000020000540 RSI: 0000000020000400 RDI: 00000000200003c0
RBP: 00007f2a746c847a R08: fffffffffffffffc R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f2a7479c1f0 R15: 00007ffdd93ca718
 </TASK>

Allocated by task 9978:
 kasan_save_stack+0x33/0x50 mm/kasan/common.c:47
 kasan_set_track+0x24/0x30 mm/kasan/common.c:61
 ____kasan_kmalloc mm/kasan/common.c:375 [inline]
 __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:384
 kasan_kmalloc include/linux/kasan.h:198 [inline]
 __do_kmalloc_node mm/slub.c:3985 [inline]
 __kmalloc_node+0x226/0x480 mm/slub.c:3992
 kmalloc_node include/linux/slab.h:610 [inline]
 kvmalloc_node+0x99/0x1a0 mm/util.c:634
 kvmalloc include/linux/slab.h:728 [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+0x62/0x6a

The buggy address belongs to the object at ffff88814cf1ed60
 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 [ffff88814cf1ed60, ffff88814cf1ed64)

The buggy address belongs to the physical page:
page:ffffea000533c780 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x14cf1e
anon flags: 0x57ff00000000800(slab|node=1|zone=2|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 057ff00000000800 ffff888013041280 0000000000000000 dead000000000001
raw: 0000000000000000 0000000080800080 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 32045363242, free_ts 0
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x2d0/0x350 mm/page_alloc.c:1540
 prep_new_page mm/page_alloc.c:1547 [inline]
 get_page_from_freelist+0xa19/0x3740 mm/page_alloc.c:3355
 __alloc_pages+0x22e/0x2410 mm/page_alloc.c:4611
 alloc_pages_mpol+0x258/0x5f0 mm/mempolicy.c:2133
 alloc_slab_page mm/slub.c:2191 [inline]
 allocate_slab mm/slub.c:2358 [inline]
 new_slab+0x283/0x3c0 mm/slub.c:2411
 ___slab_alloc+0x4ab/0x1990 mm/slub.c:3544
 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3629
 __slab_alloc_node mm/slub.c:3682 [inline]
 slab_alloc_node mm/slub.c:3854 [inline]
 __do_kmalloc_node mm/slub.c:3984 [inline]
 __kmalloc+0x3b4/0x440 mm/slub.c:3998
 kmalloc include/linux/slab.h:594 [inline]
 kzalloc include/linux/slab.h:711 [inline]
 shrinker_alloc+0x1ed/0xbb0 mm/shrinker.c:722
 zs_register_shrinker mm/zsmalloc.c:2127 [inline]
 zs_create_pool+0x54d/0x9e0 mm/zsmalloc.c:2275
 zpool_create_pool+0x103/0x320 mm/zpool.c:174
 zswap_pool_create+0x21c/0xb70 mm/zswap.c:1077
 __zswap_pool_create_fallback mm/zswap.c:1170 [inline]
 zswap_setup+0x2ec/0x6d0 mm/zswap.c:1924
 zswap_init+0x2c/0x40 mm/zswap.c:1962
 do_one_initcall+0x128/0x680 init/main.c:1236
 do_initcall_level init/main.c:1298 [inline]
 do_initcalls init/main.c:1314 [inline]
 do_basic_setup init/main.c:1333 [inline]
 kernel_init_freeable+0x692/0xc30 init/main.c:1551
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88814cf1ec00: fb fc fc fc fb fc fc fc 00 fc fc fc fb fc fc fc
 ffff88814cf1ec80: 05 fc fc fc fa fc fc fc fb fc fc fc fa fc fc fc
>ffff88814cf1ed00: 00 fc fc fc fb fc fc fc fb fc fc fc 04 fc fc fc
                                                       ^
 ffff88814cf1ed80: 00 fc fc fc fb fc fc fc fa fc fc fc fb fc fc fc
 ffff88814cf1ee00: 00 fc fc fc fa fc fc fc fb fc fc fc fb fc fc fc
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