==================================================================
BUG: KASAN: slab-out-of-bounds in hci_le_ext_adv_report_evt net/bluetooth/hci_event.c:5935 [inline]
BUG: KASAN: slab-out-of-bounds in hci_le_meta_evt+0x12db/0x3b80 net/bluetooth/hci_event.c:6208
Read of size 1 at addr ffff888140789c04 by task kworker/u5:8/4202

CPU: 1 PID: 4202 Comm: kworker/u5:8 Not tainted 5.15.189-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: hci1 hci_rx_work
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 print_address_description+0x60/0x2d0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0xdf/0x130 mm/kasan/report.c:451
 hci_le_ext_adv_report_evt net/bluetooth/hci_event.c:5935 [inline]
 hci_le_meta_evt+0x12db/0x3b80 net/bluetooth/hci_event.c:6208
 hci_event_packet+0xe05/0x12f0 net/bluetooth/hci_event.c:6525
 hci_rx_work+0x255/0xa10 net/bluetooth/hci_core.c:5160
 process_one_work+0x863/0x1000 kernel/workqueue.c:2310
 worker_thread+0xaa8/0x12a0 kernel/workqueue.c:2457
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>

Allocated by task 4752:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 ____kasan_kmalloc mm/kasan/common.c:513 [inline]
 __kasan_kmalloc+0xb5/0xf0 mm/kasan/common.c:522
 kmalloc_reserve net/core/skbuff.c:356 [inline]
 __alloc_skb+0x22c/0x750 net/core/skbuff.c:427
 alloc_skb include/linux/skbuff.h:1162 [inline]
 bt_skb_alloc include/net/bluetooth/bluetooth.h:392 [inline]
 vhci_get_user drivers/bluetooth/hci_vhci.c:170 [inline]
 vhci_write+0xbc/0x450 drivers/bluetooth/hci_vhci.c:290
 call_write_iter include/linux/fs.h:2172 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0x712/0xd00 fs/read_write.c:594
 ksys_write+0x14d/0x250 fs/read_write.c:647
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

The buggy address belongs to the object at ffff888140789800
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 4 bytes to the right of
 1024-byte region [ffff888140789800, ffff888140789c00)
The buggy address belongs to the page:
page:ffffea000501e200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x140788
head:ffffea000501e200 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x57ff00000010200(slab|head|node=1|zone=2|lastcpupid=0x7ff)
raw: 057ff00000010200 dead000000000100 dead000000000122 ffff888016841dc0
raw: 0000000000000000 0000000080100010 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 0x0(), pid 1, ts 2332343528, free_ts 0
 create_dummy_stack mm/page_owner.c:59 [inline]
 register_early_stack+0x86/0xe0 mm/page_owner.c:75
 init_page_owner+0x2f/0x750 mm/page_owner.c:85
 kernel_init_freeable+0x3c9/0x560 init/main.c:1613
 kernel_init+0x19/0x1b0 init/main.c:1506
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888140789b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888140789b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888140789c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff888140789c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888140789d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================