================================================================== BUG: KASAN: use-after-free in __list_del_entry_valid+0x80/0x120 lib/list_debug.c:59 Read of size 8 at addr ffff8880283c8518 by task syz.7.6230/30594 CPU: 0 PID: 30594 Comm: syz.7.6230 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0xa8/0x210 mm/kasan/report.c:420 kasan_report+0x10b/0x140 mm/kasan/report.c:524 __list_del_entry_valid+0x80/0x120 lib/list_debug.c:59 __list_del_entry include/linux/list.h:134 [inline] list_del_init include/linux/list.h:206 [inline] bt_accept_unlink+0x35/0x230 net/bluetooth/af_bluetooth.c:232 l2cap_sock_teardown_cb+0x1af/0x380 net/bluetooth/l2cap_sock.c:1636 l2cap_chan_del+0xab/0x620 net/bluetooth/l2cap_core.c:680 l2cap_conn_del+0x3c4/0x6a0 net/bluetooth/l2cap_core.c:1955 hci_disconn_cfm include/net/bluetooth/hci_core.h:1829 [inline] hci_conn_hash_flush+0x113/0x290 net/bluetooth/hci_conn.c:2504 hci_dev_close_sync+0x930/0xf40 net/bluetooth/hci_sync.c:5246 hci_dev_do_close net/bluetooth/hci_core.c:510 [inline] hci_dev_close+0x102/0x1f0 net/bluetooth/hci_core.c:535 sock_do_ioctl+0xfb/0x320 net/socket.c:1201 sock_ioctl+0x4d2/0x710 net/socket.c:1320 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f0ff879aeb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f0ff95df028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f0ff8a16090 RCX: 00007f0ff879aeb9 RDX: 0000000000000000 RSI: 00000000400448ca RDI: 0000000000000005 RBP: 00007f0ff8808c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f0ff8a16128 R14: 00007f0ff8a16090 R15: 00007ffc86171028 Allocated by task 30299: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0x8e/0xa0 mm/kasan/common.c:384 kmalloc include/linux/slab.h:563 [inline] rtnl_newlink+0x109/0x2080 net/core/rtnetlink.c:3651 rtnetlink_rcv_msg+0x87c/0xfc0 net/core/rtnetlink.c:6150 netlink_rcv_skb+0x1fb/0x450 net/netlink/af_netlink.c:2511 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x74d/0x8d0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x8ad/0xbd0 net/netlink/af_netlink.c:1872 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] __sys_sendto+0x497/0x650 net/socket.c:2152 __do_sys_sendto net/socket.c:2164 [inline] __se_sys_sendto net/socket.c:2160 [inline] __x64_sys_sendto+0xda/0xf0 net/socket.c:2160 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:46 __kasan_record_aux_stack+0xb2/0xc0 mm/kasan/generic.c:486 call_rcu+0x14f/0x990 kernel/rcu/tree.c:2849 netlink_release+0x158e/0x19e0 net/netlink/af_netlink.c:799 __sock_release net/socket.c:654 [inline] sock_close+0xd5/0x240 net/socket.c:1399 __fput+0x22c/0x920 fs/file_table.c:320 task_work_run+0x1d0/0x260 kernel/task_work.c:203 exit_task_work include/linux/task_work.h:39 [inline] do_exit+0x982/0x2480 kernel/exit.c:880 do_group_exit+0x217/0x2d0 kernel/exit.c:1022 __do_sys_exit_group kernel/exit.c:1033 [inline] __se_sys_exit_group kernel/exit.c:1031 [inline] __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1031 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Second to last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:46 __kasan_record_aux_stack+0xb2/0xc0 mm/kasan/generic.c:486 call_rcu+0x14f/0x990 kernel/rcu/tree.c:2849 netdev_for_each_tx_queue include/linux/netdevice.h:2465 [inline] dev_shutdown+0x92/0x440 net/sched/sch_generic.c:1492 unregister_netdevice_many+0xa4f/0x1930 net/core/dev.c:10981 ieee80211_remove_interfaces+0x453/0x710 net/mac80211/iface.c:2390 ieee80211_unregister_hw+0x59/0x290 net/mac80211/main.c:1483 mac80211_hwsim_del_radio+0x285/0x480 drivers/net/wireless/mac80211_hwsim.c:4688 hwsim_exit_net+0x589/0x650 drivers/net/wireless/mac80211_hwsim.c:5475 ops_exit_list net/core/net_namespace.c:172 [inline] cleanup_net+0x706/0xba0 net/core/net_namespace.c:640 process_one_work+0x8a2/0x1160 kernel/workqueue.c:2292 worker_thread+0xaa2/0x1270 kernel/workqueue.c:2439 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff8880283c8000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1304 bytes inside of 2048-byte region [ffff8880283c8000, ffff8880283c8800) The buggy address belongs to the physical page: page:ffffea0000a0f200 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880283c8000 pfn:0x283c8 head:ffffea0000a0f200 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0001d81a08 ffffea000090c208 ffff888017442000 raw: ffff8880283c8000 0000000000080005 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 7021, tgid 7021 (syz-executor), ts 171513759287, free_ts 171189994297 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2532 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x1a1e/0x1ab0 mm/page_alloc.c:4328 __alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5614 alloc_slab_page+0x5d/0x160 mm/slub.c:1799 allocate_slab mm/slub.c:1944 [inline] new_slab+0x87/0x2c0 mm/slub.c:1997 ___slab_alloc+0xbc6/0x1240 mm/slub.c:3154 __slab_alloc mm/slub.c:3240 [inline] slab_alloc_node mm/slub.c:3325 [inline] __kmem_cache_alloc_node+0x1a0/0x260 mm/slub.c:3398 __do_kmalloc_node mm/slab_common.c:935 [inline] __kmalloc+0xa0/0x240 mm/slab_common.c:949 kmalloc include/linux/slab.h:568 [inline] sk_prot_alloc+0xe7/0x210 net/core/sock.c:2052 sk_alloc+0x36/0x340 net/core/sock.c:2108 __netlink_create+0x6b/0x2d0 net/netlink/af_netlink.c:629 netlink_create+0x3a7/0x510 net/netlink/af_netlink.c:692 __sock_create+0x4a2/0x940 net/socket.c:1549 sock_create net/socket.c:1605 [inline] __sys_socket_create net/socket.c:1642 [inline] __sys_socket+0xc4/0x190 net/socket.c:1670 __do_sys_socket net/socket.c:1683 [inline] __se_sys_socket net/socket.c:1681 [inline] __x64_sys_socket+0x76/0x80 net/socket.c:1681 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1459 [inline] free_pcp_prepare mm/page_alloc.c:1509 [inline] free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3384 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3479 free_slab mm/slub.c:2036 [inline] discard_slab mm/slub.c:2042 [inline] __unfreeze_partials+0x1a5/0x200 mm/slub.c:2591 put_cpu_partial+0x17c/0x250 mm/slub.c:2667 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x144/0x160 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x1e/0x80 mm/kasan/common.c:306 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x4b/0x480 mm/slab.h:737 slab_alloc_node mm/slub.c:3359 [inline] __kmem_cache_alloc_node+0x140/0x260 mm/slub.c:3398 kmalloc_trace+0x26/0xe0 mm/slab_common.c:1026 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] dropmon_net_event+0x222/0x2a0 net/core/drop_monitor.c:1568 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:455 call_netdevice_notifiers_extack net/core/dev.c:2039 [inline] call_netdevice_notifiers net/core/dev.c:2053 [inline] register_netdevice+0x1640/0x1ae0 net/core/dev.c:10237 bpq_new_device drivers/net/hamradio/bpqether.c:499 [inline] bpq_device_event+0x48c/0x8b0 drivers/net/hamradio/bpqether.c:542 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:455 call_netdevice_notifiers_extack net/core/dev.c:2039 [inline] call_netdevice_notifiers net/core/dev.c:2053 [inline] __dev_notify_flags+0x194/0x300 net/core/dev.c:8676 Memory state around the buggy address: ffff8880283c8400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880283c8480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880283c8500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880283c8580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880283c8600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================