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BUG: KASAN: slab-out-of-bounds in string_nocheck lib/vsprintf.c:648 [inline]
BUG: KASAN: slab-out-of-bounds in string+0x471/0x4d0 lib/vsprintf.c:730
Read of size 1 at addr ffff88802ae71f9c by task syz-executor288/6040

CPU: 3 UID: 0 PID: 6040 Comm: syz-executor288 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0x13d/0x4b0 mm/kasan/report.c:482
 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595
 string_nocheck lib/vsprintf.c:648 [inline]
 string+0x471/0x4d0 lib/vsprintf.c:730
 vsnprintf+0x422/0x1300 lib/vsprintf.c:2949
 va_format+0x14e/0x4b0 lib/vsprintf.c:1725
 pointer+0x929/0xe50 lib/vsprintf.c:2577
 vsnprintf+0x649/0x1300 lib/vsprintf.c:2953
 vprintk_store+0x3b3/0xbe0 kernel/printk/printk.c:2307
 vprintk_emit+0x139/0x6b0 kernel/printk/printk.c:2455
 _printk+0xcf/0x110 kernel/printk/printk.c:2504
 __dynamic_pr_debug+0x201/0x270 lib/dynamic_debug.c:879
 nfc_llcp_wks_sap net/nfc/llcp_core.c:344 [inline]
 nfc_llcp_get_sdp_ssap+0x32d/0x4c0 net/nfc/llcp_core.c:420
 llcp_sock_bind+0x3c0/0x720 net/nfc/llcp_sock.c:114
 __sys_bind_socket net/socket.c:1945 [inline]
 __sys_bind_socket net/socket.c:1937 [inline]
 __sys_bind+0x1a9/0x260 net/socket.c:1976
 __do_sys_bind net/socket.c:1981 [inline]
 __se_sys_bind net/socket.c:1979 [inline]
 __x64_sys_bind+0x72/0xb0 net/socket.c:1979
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7feddf516bc7
Code: 49 0f bc c4 c1 e0 1a 0d 00 00 04 00 89 01 e9 e0 fe ff ff e8 3b 04 00 00 66 2e 0f 1f 84 00 00 00 00 00 90 b8 31 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 d8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffdfafd6f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000031
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007feddf516bc7
RDX: 0000000000000060 RSI: 00007fffdfafd710 RDI: 0000000000000003
RBP: 00007fffdfafd710 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffdfafd722
R13: 0000000000000003 R14: 00007feddf599cc0 R15: 0000000000000002
 </TASK>

Allocated by task 6040:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5337 [inline]
 __kmalloc_node_track_caller_noprof+0x333/0x830 mm/slub.c:5466
 kmemdup_noprof+0x29/0x60 mm/util.c:138
 kmemdup_noprof include/linux/fortify-string.h:715 [inline]
 llcp_sock_bind+0x37c/0x720 net/nfc/llcp_sock.c:107
 __sys_bind_socket net/socket.c:1945 [inline]
 __sys_bind_socket net/socket.c:1937 [inline]
 __sys_bind+0x1a9/0x260 net/socket.c:1976
 __do_sys_bind net/socket.c:1981 [inline]
 __se_sys_bind net/socket.c:1979 [inline]
 __x64_sys_bind+0x72/0xb0 net/socket.c:1979
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88802ae71f80
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes to the right of
 allocated 28-byte region [ffff88802ae71f80, ffff88802ae71f9c)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2ae71
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801c042780 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800400040 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 0xd2800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3118, tgid 3118 (kworker/u33:1), ts 19823216618
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1871
 prep_new_page mm/page_alloc.c:1879 [inline]
 get_page_from_freelist+0x110d/0x35b0 mm/page_alloc.c:3943
 __alloc_frozen_pages_noprof+0x2eb/0x3300 mm/page_alloc.c:5436
 alloc_slab_page mm/slub.c:3267 [inline]
 allocate_slab mm/slub.c:3382 [inline]
 new_slab+0xa5/0x640 mm/slub.c:3428
 refill_objects+0xe3/0x410 mm/slub.c:7305
 refill_sheaf mm/slub.c:2805 [inline]
 __pcs_replace_empty_main+0x372/0x680 mm/slub.c:4677
 alloc_from_pcs mm/slub.c:4775 [inline]
 slab_alloc_node mm/slub.c:4907 [inline]
 __kmalloc_cache_noprof+0x47b/0x6b0 mm/slub.c:5480
 _kmalloc_noprof include/linux/slab.h:988 [inline]
 slab_free_hook mm/slub.c:2630 [inline]
 slab_free mm/slub.c:6372 [inline]
 kmem_cache_free+0x40f/0x6b0 mm/slub.c:6499
 file_free fs/file_table.c:104 [inline]
 __fput_deferred+0x3e9/0x4a0 fs/file_table.c:567
 fput_close+0x118/0x250 fs/file_table.c:629
 path_openat+0x1033/0x2440 fs/namei.c:5009
 do_file_open+0x20e/0x430 fs/namei.c:5029
 do_open_execat+0xd1/0x360 fs/exec.c:785
 alloc_bprm+0x2d/0x9e0 fs/exec.c:1493
 class_bprm_constructor fs/exec.c:1558 [inline]
 kernel_execve+0x8f/0x3a0 fs/exec.c:1955
 call_usermodehelper_exec_async+0x239/0x4b0 kernel/umh.c:107
page last free pid 37 tgid 37 ts 19816490053 stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 __free_pages_prepare mm/page_alloc.c:1418 [inline]
 __free_frozen_pages+0x79f/0x10f0 mm/page_alloc.c:2962
 __kasan_populate_vmalloc_do mm/kasan/shadow.c:393 [inline]
 __kasan_populate_vmalloc+0x1ea/0x210 mm/kasan/shadow.c:424
 kasan_populate_vmalloc include/linux/kasan.h:580 [inline]
 alloc_vmap_area+0x95d/0x2bb0 mm/vmalloc.c:2146
 __get_vm_area_node+0x1ed/0x350 mm/vmalloc.c:3249
 __vmalloc_node_range_noprof+0x262/0x1460 mm/vmalloc.c:4065
 __vmalloc_node_noprof+0xad/0xf0 mm/vmalloc.c:4166
 alloc_thread_stack_node kernel/fork.c:359 [inline]
 dup_task_struct kernel/fork.c:930 [inline]
 copy_process+0x803/0x8370 kernel/fork.c:2139
 kernel_clone+0x176/0x9d0 kernel/fork.c:2772
 user_mode_thread+0xd1/0x120 kernel/fork.c:2849
 call_usermodehelper_exec_work kernel/umh.c:169 [inline]
 call_usermodehelper_exec_work+0xcb/0x180 kernel/umh.c:155
 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3387
 process_scheduled_works kernel/workqueue.c:3470 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3551
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Memory state around the buggy address:
 ffff88802ae71e80: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc
 ffff88802ae71f00: 00 00 00 00 fc fc fc fc fa fb fb fb fc fc fc fc
>ffff88802ae71f80: 00 00 00 04 fc fc fc fc 00 00 00 00 fc fc fc fc
                            ^
 ffff88802ae72000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88802ae72080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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