Bluetooth: hci4: Unknown advertising packet type: 0x20 ================================================================== BUG: KASAN: slab-out-of-bounds in hci_le_ext_adv_report_evt net/bluetooth/hci_event.c:5971 [inline] BUG: KASAN: slab-out-of-bounds in hci_le_meta_evt+0x12cf/0x3ca0 net/bluetooth/hci_event.c:6245 Read of size 1 at addr ffff88805b0cfc0a by task kworker/u5:1/4189 CPU: 0 PID: 4189 Comm: kworker/u5:1 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 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:5971 [inline] hci_le_meta_evt+0x12cf/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 Allocated by task 5806: 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 The buggy address belongs to the object at ffff88805b0cf800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 10 bytes to the right of 1024-byte region [ffff88805b0cf800, ffff88805b0cfc00) The buggy address belongs to the page: page:ffffea00016c3200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5b0c8 head:ffffea00016c3200 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 0x1d2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 4329, ts 71955994973, free_ts 21050058731 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_fclone include/linux/skbuff.h:1212 [inline] sk_stream_alloc_skb+0x204/0xb50 net/ipv4/tcp.c:892 tso_fragment net/ipv4/tcp_output.c:2131 [inline] tcp_write_xmit+0x111e/0x65c0 net/ipv4/tcp_output.c:2704 __tcp_push_pending_frames+0x92/0x250 net/ipv4/tcp_output.c:2903 tcp_push_pending_frames include/net/tcp.h:1916 [inline] tcp_data_snd_check net/ipv4/tcp_input.c:5572 [inline] tcp_rcv_established+0xe25/0x1d00 net/ipv4/tcp_input.c:6068 tcp_v4_do_rcv+0x435/0x9b0 net/ipv4/tcp_ipv4.c:1732 sk_backlog_rcv include/net/sock.h:1080 [inline] __release_sock+0x1e6/0x460 net/core/sock.c:2731 release_sock+0x5b/0x1b0 net/core/sock.c:3274 sk_wait_data+0x203/0x470 net/core/sock.c:2776 tcp_recvmsg_locked+0xe63/0x2690 net/ipv4/tcp.c:2451 tcp_recvmsg+0x22a/0x760 net/ipv4/tcp.c:2566 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_contig_range+0x96/0xf0 mm/page_alloc.c:9428 destroy_args+0xef/0xa00 mm/debug_vm_pgtable.c:1018 debug_vm_pgtable+0x321/0x380 mm/debug_vm_pgtable.c:1336 do_one_initcall+0x272/0x730 init/main.c:1315 do_initcall_level+0x13d/0x1f0 init/main.c:1388 do_initcalls+0x4b/0x90 init/main.c:1404 kernel_init_freeable+0x3d5/0x560 init/main.c:1628 kernel_init+0x19/0x1b0 init/main.c:1519 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Memory state around the buggy address: ffff88805b0cfb00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88805b0cfb80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88805b0cfc00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88805b0cfc80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88805b0cfd00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================