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BUG: KASAN: slab-out-of-bounds in add_adv_patterns_monitor+0x91f/0xa90 net/bluetooth/mgmt.c:4266
Read of size 1 at addr ffff888025677cc9 by task syz-executor.0/31797

CPU: 0 PID: 31797 Comm: syz-executor.0 Not tainted 5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:120
 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:230
 __kasan_report mm/kasan/report.c:396 [inline]
 kasan_report.cold+0x79/0xd5 mm/kasan/report.c:413
 add_adv_patterns_monitor+0x91f/0xa90 net/bluetooth/mgmt.c:4266
 hci_mgmt_cmd net/bluetooth/hci_sock.c:1603 [inline]
 hci_sock_sendmsg+0x1b9c/0x21d0 net/bluetooth/hci_sock.c:1738
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:672
 sock_write_iter+0x289/0x3c0 net/socket.c:999
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write+0x426/0x650 fs/read_write.c:518
 vfs_write+0x791/0xa30 fs/read_write.c:605
 ksys_write+0x1ee/0x250 fs/read_write.c:658
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x465b09
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd65b1fa188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000465b09
RDX: 0000000000000009 RSI: 0000000020000000 RDI: 0000000000000005
RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c008
R13: 00007ffc3fe2f93f R14: 00007fd65b1fa300 R15: 0000000000022000

Allocated by task 31797:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:401 [inline]
 ____kasan_kmalloc.constprop.0+0x82/0xa0 mm/kasan/common.c:429
 kmalloc include/linux/slab.h:557 [inline]
 hci_mgmt_cmd net/bluetooth/hci_sock.c:1508 [inline]
 hci_sock_sendmsg+0x9bc/0x21d0 net/bluetooth/hci_sock.c:1738
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:672
 sock_write_iter+0x289/0x3c0 net/socket.c:999
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write+0x426/0x650 fs/read_write.c:518
 vfs_write+0x791/0xa30 fs/read_write.c:605
 ksys_write+0x1ee/0x250 fs/read_write.c:658
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff888025677cc0
 which belongs to the cache kmalloc-16 of size 16
The buggy address is located 9 bytes inside of
 16-byte region [ffff888025677cc0, ffff888025677cd0)
The buggy address belongs to the page:
page:0000000043b73ab5 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888025677520 pfn:0x25677
flags: 0xfff00000000200(slab)
raw: 00fff00000000200 ffffea0000539800 0000001300000013 ffff888010c41b40
raw: ffff888025677520 0000000080800071 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888025677b80: 00 00 fc fc fb fb fc fc fa fb fc fc 00 00 fc fc
 ffff888025677c00: 00 00 fc fc fa fb fc fc 00 00 fc fc fb fb fc fc
>ffff888025677c80: fb fb fc fc 00 00 fc fc 00 01 fc fc 00 00 fc fc
                                              ^
 ffff888025677d00: fb fb fc fc 00 00 fc fc fb fb fc fc fa fb fc fc
 ffff888025677d80: 00 00 fc fc fb fb fc fc fa fb fc fc fa fb fc fc
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