Bluetooth: hci4: Unknown advertising packet type: 0x18 ================================================================== BUG: KASAN: slab-out-of-bounds in hci_le_ext_adv_report_evt net/bluetooth/hci_event.c:5965 [inline] BUG: KASAN: slab-out-of-bounds in hci_le_meta_evt+0x133f/0x3c90 net/bluetooth/hci_event.c:6238 Read of size 1 at addr ffff888077657c07 by task kworker/u5:7/4202 CPU: 1 PID: 4202 Comm: kworker/u5:7 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Workqueue: hci4 hci_rx_work Call Trace: 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:5965 [inline] hci_le_meta_evt+0x133f/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 Allocated by task 11803: 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_del net/core/neighbour.c:197 [inline] neigh_remove_one+0x4e8/0x5f0 net/core/neighbour.c:218 neigh_forced_gc net/core/neighbour.c:251 [inline] neigh_alloc net/core/neighbour.c:429 [inline] ___neigh_create+0x468/0x2250 net/core/neighbour.c:591 ip6_finish_output2+0x9f6/0x1510 net/ipv6/ip6_output.c:127 dst_output include/net/dst.h:452 [inline] NF_HOOK include/linux/netfilter.h:302 [inline] ip6_xmit+0x109b/0x16d0 net/ipv6/ip6_output.c:338 tcp_v6_send_synack+0x78d/0xb80 net/ipv6/tcp_ipv6.c:560 tcp_conn_request+0x1d0a/0x28a0 net/ipv4/tcp_input.c:7082 tcp_rcv_state_process+0x13e7/0x4190 net/ipv4/tcp_input.c:6528 tcp_v6_do_rcv+0x8c9/0x1180 net/ipv6/tcp_ipv6.c:1549 tcp_v6_rcv+0x205a/0x26d0 net/ipv6/tcp_ipv6.c:1753 ip6_protocol_deliver_rcu+0x8f6/0x12c0 net/ipv6/ip6_input.c:425 ip6_input_finish+0xa2/0x130 net/ipv6/ip6_input.c:466 NF_HOOK+0x303/0x390 include/linux/netfilter.h:302 NF_HOOK+0x303/0x390 include/linux/netfilter.h:302 __netif_receive_skb_one_core net/core/dev.c:5551 [inline] __netif_receive_skb+0xcc/0x290 net/core/dev.c:5665 netif_receive_skb_internal net/core/dev.c:5751 [inline] netif_receive_skb+0x19e/0x700 net/core/dev.c:5810 tun_rx_batched+0x5fb/0x760 drivers/net/tun.c:-1 tun_get_user+0x2517/0x3a70 drivers/net/tun.c:1989 tun_chr_write_iter+0x112/0x1e0 drivers/net/tun.c:2019 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 The buggy address belongs to the object at ffff888077657800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 7 bytes to the right of 1024-byte region [ffff888077657800, ffff888077657c00) The buggy address belongs to the page: page:ffffea0001dd9400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x77650 head:ffffea0001dd9400 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 dead000000000100 dead000000000122 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 4261, ts 60503165177, free_ts 60475875395 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x1bbd/0x1ca0 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+0x80a/0xdd0 mm/slub.c:3013 __slab_alloc mm/slub.c:3100 [inline] slab_alloc_node mm/slub.c:3191 [inline] __kmalloc_node_track_caller+0x1fc/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:953 [inline] inet6_rt_notify+0xdd/0x290 net/ipv6/route.c:6181 fib6_add_rt2node net/ipv6/ip6_fib.c:1255 [inline] fib6_add+0x1d4d/0x3d40 net/ipv6/ip6_fib.c:1484 __ip6_ins_rt net/ipv6/route.c:1305 [inline] ip6_ins_rt+0xd3/0x130 net/ipv6/route.c:1315 __ipv6_ifa_notify+0x4e4/0xe60 net/ipv6/addrconf.c:6185 ipv6_ifa_notify net/ipv6/addrconf.c:6224 [inline] addrconf_dad_completed+0x184/0xc80 net/ipv6/addrconf.c:4236 addrconf_dad_work+0xc8c/0x1540 net/ipv6/addrconf.c:-1 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 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 qlist_free_all+0x35/0x90 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x150/0x160 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xd0 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+0x12d/0x2d0 mm/slub.c:3261 __alloc_skb+0xf4/0x750 net/core/skbuff.c:415 alloc_skb include/linux/skbuff.h:1162 [inline] mld_newpack+0x12f/0xb90 net/ipv6/mcast.c:1745 add_grhead+0x5a/0x240 net/ipv6/mcast.c:1856 add_grec+0x1341/0x15d0 net/ipv6/mcast.c:1994 mld_send_cr net/ipv6/mcast.c:2120 [inline] mld_ifc_work+0x6e7/0xb40 net/ipv6/mcast.c:2658 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 Memory state around the buggy address: ffff888077657b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888077657b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888077657c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888077657c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888077657d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================