Bluetooth: hci2: Unknown advertising packet type: 0x20
==================================================================
BUG: KASAN: slab-out-of-bounds in hci_le_ext_adv_report_evt net/bluetooth/hci_event.c:5972 [inline]
BUG: KASAN: slab-out-of-bounds in hci_le_meta_evt+0x12ea/0x3ca0 net/bluetooth/hci_event.c:6245
Read of size 1 at addr ffff888075aa3409 by task kworker/u5:4/4201

CPU: 1 PID: 4201 Comm: kworker/u5:4 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: hci2 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:5972 [inline]
 hci_le_meta_evt+0x12ea/0x3ca0 net/bluetooth/hci_event.c:6245
 hci_event_packet+0xe0b/0x1310 net/bluetooth/hci_event.c:6562
 hci_rx_work+0x255/0xa10 net/bluetooth/hci_core.c:5190
 process_one_work+0x867/0xff0 kernel/workqueue.c:2310
 worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457
 kthread+0x42e/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>

Allocated by task 8488:
 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+0xaf/0xe0 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:395 [inline]
 vhci_get_user drivers/bluetooth/hci_vhci.c:170 [inline]
 vhci_write+0xbd/0x440 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+0x748/0xd70 fs/read_write.c:594
 ksys_write+0x153/0x260 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+0x105/0x7f0 kernel/rcu/tree.c:3600
 put_css_set kernel/cgroup/cgroup-internal.h:212 [inline]
 cgroup_free+0x143/0x1d0 kernel/cgroup/cgroup.c:6542
 __put_task_struct+0xe3/0x480 kernel/fork.c:756
 rcu_do_batch kernel/rcu/tree.c:2523 [inline]
 rcu_core+0x96e/0x1650 kernel/rcu/tree.c:2763
 handle_softirqs+0x336/0x830 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676

The buggy address belongs to the object at ffff888075aa3000
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 9 bytes to the right of
 1024-byte region [ffff888075aa3000, ffff888075aa3400)
The buggy address belongs to the page:
page:ffffea0001d6a800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x75aa0
head:ffffea0001d6a800 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 0000000100000001 ffff888016c41dc0
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1109, ts 76404302746, free_ts 76374331033
 prep_new_page mm/page_alloc.c:2426 [inline]
 get_page_from_freelist+0x24f6/0x2670 mm/page_alloc.c:4192
 __alloc_pages+0x1ee/0x480 mm/page_alloc.c:5501
 alloc_slab_page mm/slub.c:1780 [inline]
 allocate_slab mm/slub.c:1917 [inline]
 new_slab+0xc0/0x4b0 mm/slub.c:1980
 ___slab_alloc+0x807/0xdd0 mm/slub.c:3013
 __slab_alloc mm/slub.c:3100 [inline]
 slab_alloc_node mm/slub.c:3191 [inline]
 __kmalloc_node_track_caller+0x13d/0x3a0 mm/slub.c:4963
 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]
 nlmsg_new include/net/netlink.h:964 [inline]
 inet6_rt_notify+0xe0/0x290 net/ipv6/route.c:6183
 fib6_add_rt2node net/ipv6/ip6_fib.c:1258 [inline]
 fib6_add+0x1e9a/0x3ee0 net/ipv6/ip6_fib.c:1487
 __ip6_ins_rt net/ipv6/route.c:1306 [inline]
 ip6_ins_rt+0xd3/0x130 net/ipv6/route.c:1316
 __ipv6_ifa_notify+0x4e4/0xe60 net/ipv6/addrconf.c:6195
 ipv6_ifa_notify net/ipv6/addrconf.c:6234 [inline]
 addrconf_dad_completed+0x186/0xc80 net/ipv6/addrconf.c:4246
 addrconf_dad_work+0xc83/0x1530 net/ipv6/addrconf.c:-1
 process_one_work+0x867/0xff0 kernel/workqueue.c:2310
 worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457
 kthread+0x42e/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1340 [inline]
 free_pcp_prepare mm/page_alloc.c:1391 [inline]
 free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317
 free_unref_page+0x8f/0x2a0 mm/page_alloc.c:3396
 free_slab mm/slub.c:2020 [inline]
 discard_slab mm/slub.c:2026 [inline]
 __unfreeze_partials+0x188/0x1e0 mm/slub.c:2512
 put_cpu_partial+0x12d/0x190 mm/slub.c:2592
 qlist_free_all+0x35/0x90 mm/kasan/quarantine.c:176
 kasan_quarantine_reduce+0x150/0x160 mm/kasan/quarantine.c:283
 __kasan_slab_alloc+0x2f/0xc0 mm/kasan/common.c:444
 kasan_slab_alloc include/linux/kasan.h:254 [inline]
 slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519
 slab_alloc_node mm/slub.c:3225 [inline]
 kmem_cache_alloc_node+0x184/0x2c0 mm/slub.c:3261
 __alloc_skb+0xf4/0x750 net/core/skbuff.c:415
 alloc_skb include/linux/skbuff.h:1162 [inline]
 nlmsg_new include/net/netlink.h:964 [inline]
 netlink_ack+0x35c/0xb10 net/netlink/af_netlink.c:2454
 netlink_rcv_skb+0x267/0x430 net/netlink/af_netlink.c:2525
 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
 netlink_unicast+0x78f/0x940 net/netlink/af_netlink.c:1340
 netlink_sendmsg+0x8ba/0xbe0 net/netlink/af_netlink.c:1919
 sock_sendmsg_nosec net/socket.c:706 [inline]
 __sock_sendmsg net/socket.c:718 [inline]
 __sys_sendto+0x46d/0x620 net/socket.c:2073
 __do_sys_sendto net/socket.c:2085 [inline]
 __se_sys_sendto net/socket.c:2081 [inline]
 __x64_sys_sendto+0xda/0xf0 net/socket.c:2081

Memory state around the buggy address:
 ffff888075aa3300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888075aa3380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888075aa3400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                      ^
 ffff888075aa3480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888075aa3500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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