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BUG: KASAN: slab-out-of-bounds in create_monitor_event+0x7a8/0x84c net/bluetooth/hci_sock.c:491
Read of size 8 at addr ffff0000c7102acf by task syz-executor.4/7908

CPU: 0 PID: 7908 Comm: syz-executor.4 Not tainted 6.6.0-rc6-syzkaller-g78124b0c1d10 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
Call trace:
 dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233
 show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0x174/0x514 mm/kasan/report.c:475
 kasan_report+0xd8/0x138 mm/kasan/report.c:588
 __asan_report_load_n_noabort+0x1c/0x28 mm/kasan/report_generic.c:391
 create_monitor_event+0x7a8/0x84c net/bluetooth/hci_sock.c:491
 send_monitor_replay+0x88/0x52c net/bluetooth/hci_sock.c:723
 hci_sock_bind+0x464/0xe88 net/bluetooth/hci_sock.c:1387
 __sys_bind+0x1e8/0x284 net/socket.c:1849
 __do_sys_bind net/socket.c:1860 [inline]
 __se_sys_bind net/socket.c:1858 [inline]
 __arm64_sys_bind+0x7c/0x94 net/socket.c:1858
 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155
 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595

Allocated by task 6070:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4c/0x7c mm/kasan/common.c:52
 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:511
 ____kasan_kmalloc mm/kasan/common.c:374 [inline]
 __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:383
 kasan_kmalloc include/linux/kasan.h:198 [inline]
 __do_kmalloc_node mm/slab_common.c:1023 [inline]
 __kmalloc_node_track_caller+0xd0/0x1c0 mm/slab_common.c:1043
 kvasprintf+0x108/0x1dc lib/kasprintf.c:25
 kvasprintf_const+0xdc/0x230 lib/kasprintf.c:49
 kobject_set_name_vargs+0xd0/0x1b8 lib/kobject.c:272
 dev_set_name+0xe0/0x12c drivers/base/core.c:3427
 hci_register_dev+0x14c/0x954 net/bluetooth/hci_core.c:2620
 __vhci_create_device drivers/bluetooth/hci_vhci.c:434 [inline]
 vhci_create_device+0x358/0x6c4 drivers/bluetooth/hci_vhci.c:475
 vhci_get_user drivers/bluetooth/hci_vhci.c:532 [inline]
 vhci_write+0x318/0x3b8 drivers/bluetooth/hci_vhci.c:612
 call_write_iter include/linux/fs.h:1956 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x628/0x93c fs/read_write.c:584
 ksys_write+0x15c/0x26c fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __arm64_sys_write+0x7c/0x90 fs/read_write.c:646
 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155
 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595

The buggy address belongs to the object at ffff0000c7102ac8
 which belongs to the cache kmalloc-8 of size 8
The buggy address is located 2 bytes to the right of
 allocated 5-byte region [ffff0000c7102ac8, ffff0000c7102acd)

The buggy address belongs to the physical page:
page:00000000a350502f refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x107102
flags: 0x5ffc00000000800(slab|node=0|zone=2|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 05ffc00000000800 ffff0000c0001280 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000660066 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000c7102980: fc 06 fc fc fc fc 05 fc fc fc fc 02 fc fc fc fc
 ffff0000c7102a00: fa fc fc fc fc 06 fc fc fc fc 06 fc fc fc fc 06
>ffff0000c7102a80: fc fc fc fc 05 fc fc fc fc 05 fc fc fc fc 05 fc
                                              ^
 ffff0000c7102b00: fc fc fc 06 fc fc fc fc 06 fc fc fc fc 06 fc fc
 ffff0000c7102b80: fc fc 05 fc fc fc fc 05 fc fc fc fc fa fc fc fc
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