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BUG: KASAN: slab-out-of-bounds in string+0x216/0x2d0
Read of size 1 at addr ffff88810d721a81 by task syz.5.1082/8721

CPU: 0 UID: 0 PID: 8721 Comm: syz.5.1082 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 print_address_description+0x55/0x1e0
 print_report+0x58/0x70
 kasan_report+0x117/0x150
 string+0x216/0x2d0
 vsnprintf+0x74a/0xef0
 pointer+0xa12/0x1120
 vsnprintf+0x626/0xef0
 vprintk_store+0x3be/0xd90
 vprintk_emit+0x192/0x560
 _printk+0xdd/0x130
 __dynamic_pr_debug+0x1a2/0x260
 nfc_llcp_get_sdp_ssap+0x3a7/0x440
 llcp_sock_bind+0x3c5/0x780
 __sys_bind+0x2e3/0x410
 __x64_sys_bind+0x7a/0x90
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1adff9e159
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:00007f1ae0f41028 EFLAGS: 00000246 ORIG_RAX: 0000000000000031
RAX: ffffffffffffffda RBX: 00007f1ae0225fa0 RCX: 00007f1adff9e159
RDX: 0000000000000060 RSI: 0000200000000080 RDI: 0000000000000004
RBP: 00007f1ae003506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1ae0226038 R14: 00007f1ae0225fa0 R15: 00007ffeadcf1138
 </TASK>

Allocated by task 8721:
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_node_track_caller_noprof+0x4b4/0x720
 kmemdup_noprof+0x2b/0x70
 llcp_sock_bind+0x377/0x780
 __sys_bind+0x2e3/0x410
 __x64_sys_bind+0x7a/0x90
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88810d721a80
 which belongs to the cache kmalloc-8 of size 8
The buggy address is located 0 bytes to the right of
 allocated 1-byte region [ffff88810d721a80, ffff88810d721a81)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88810d7213e0 pfn:0x10d721
flags: 0x17ff00000000200(workingset|node=0|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 017ff00000000200 ffff888100041500 ffff888100040348 ffffea0004400cd0
raw: ffff88810d7213e0 0000000000800068 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 1, tgid 1 (swapper/0), ts 13984258400
 post_alloc_hook+0x1f9/0x250
 get_page_from_freelist+0x2209/0x2280
 __alloc_frozen_pages_noprof+0x217/0x5a0
 allocate_slab+0x7d/0x620
 refill_objects+0x2d5/0x350
 __pcs_replace_empty_main+0x2c8/0x6c0
 __kmalloc_cache_noprof+0x39b/0x600
 add_sysfs_param+0x758/0xb80
 kernel_add_sysfs_param+0x7f/0xe0
 param_sysfs_builtin+0x199/0x250
 param_sysfs_builtin_init+0x23/0x30
 do_one_initcall+0x250/0x870
 do_initcall_level+0x10a/0x1a0
 do_initcalls+0x59/0xa0
 kernel_init_freeable+0x29d/0x3e0
 kernel_init+0x22/0x1d0
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88810d721980: 05 fc fc fc 05 fc fc fc fa fc fc fc fa fc fc fc
 ffff88810d721a00: fa fc fc fc 00 fc fc fc 06 fc fc fc 06 fc fc fc
>ffff88810d721a80: 01 fc fc fc fa fc fc fc fa fc fc fc fa fc fc fc
                   ^
 ffff88810d721b00: 06 fc fc fc 06 fc fc fc fa fc fc fc 07 fc fc fc
 ffff88810d721b80: 00 fc fc fc fa fc fc fc fa fc fc fc fa fc fc fc
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