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BUG: KASAN: slab-out-of-bounds in hci_le_ext_adv_report_evt net/bluetooth/hci_event.c:5964 [inline]
BUG: KASAN: slab-out-of-bounds in hci_le_meta_evt+0x1324/0x3c90 net/bluetooth/hci_event.c:6238
Read of size 1 at addr ffff88814077ac03 by task kworker/u5:5/4198

CPU: 1 PID: 4198 Comm: kworker/u5:5 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: hci0 hci_rx_work
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x250 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:5964 [inline]
 hci_le_meta_evt+0x1324/0x3c90 net/bluetooth/hci_event.c:6238
 hci_event_packet+0xe48/0x1370 net/bluetooth/hci_event.c:6555
 hci_rx_work+0x255/0xa10 net/bluetooth/hci_core.c:5164
 process_one_work+0x85f/0x1010 kernel/workqueue.c:2310
 worker_thread+0xaa6/0x1290 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 7522:
 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:2173 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0x745/0xd60 fs/read_write.c:594
 ksys_write+0x152/0x260 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

Last potentially related work creation:
 kasan_save_stack+0x35/0x60 mm/kasan/common.c:38
 kasan_record_aux_stack+0xb8/0x100 mm/kasan/generic.c:348
 kvfree_call_rcu+0x105/0x7d0 kernel/rcu/tree.c:3600
 neigh_periodic_work+0x407/0xc70 net/core/neighbour.c:947
 process_one_work+0x85f/0x1010 kernel/workqueue.c:2310
 worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287

The buggy address belongs to the object at ffff88814077a800
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 3 bytes to the right of
 1024-byte region [ffff88814077a800, ffff88814077ac00)
The buggy address belongs to the page:
page:ffffea000501de00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x140778
head:ffffea000501de00 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x57ff00000010200(slab|head|node=1|zone=2|lastcpupid=0x7ff)
raw: 057ff00000010200 ffffea00051f6000 0000000600000006 ffff888016c41dc0
raw: 0000000000000000 0000000000100010 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 2627635227, free_ts 0
 create_dummy_stack mm/page_owner.c:59 [inline]
 register_early_stack+0x95/0xf0 mm/page_owner.c:75
 init_page_owner+0x2f/0x750 mm/page_owner.c:85
 kernel_init_freeable+0x3e4/0x570 init/main.c:1627
 kernel_init+0x19/0x1b0 init/main.c:1520
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88814077ab00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88814077ab80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88814077ac00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff88814077ac80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88814077ad00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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