================================================================== BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] BUG: KASAN: use-after-free in atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:111 [inline] BUG: KASAN: use-after-free in __refcount_add include/linux/refcount.h:193 [inline] BUG: KASAN: use-after-free in __refcount_inc include/linux/refcount.h:250 [inline] BUG: KASAN: use-after-free in refcount_inc include/linux/refcount.h:267 [inline] BUG: KASAN: use-after-free in sock_hold include/net/sock.h:702 [inline] BUG: KASAN: use-after-free in sco_conn_del+0xb5/0x2f0 net/bluetooth/sco.c:193 Write of size 4 at addr ffff88801a651080 by task syz-executor.5/14411 CPU: 1 PID: 14411 Comm: syz-executor.5 Not tainted 5.15.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1dc/0x2d8 lib/dump_stack.c:106 print_address_description+0x66/0x3e0 mm/kasan/report.c:256 __kasan_report mm/kasan/report.c:442 [inline] kasan_report+0x19a/0x1f0 mm/kasan/report.c:459 kasan_check_range+0x2b5/0x2f0 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:111 [inline] __refcount_add include/linux/refcount.h:193 [inline] __refcount_inc include/linux/refcount.h:250 [inline] refcount_inc include/linux/refcount.h:267 [inline] sock_hold include/net/sock.h:702 [inline] sco_conn_del+0xb5/0x2f0 net/bluetooth/sco.c:193 hci_disconn_cfm include/net/bluetooth/hci_core.h:1518 [inline] hci_conn_hash_flush+0x112/0x240 net/bluetooth/hci_conn.c:1608 hci_dev_do_close+0x93e/0xeb0 net/bluetooth/hci_core.c:1793 hci_unregister_dev+0x2a2/0x510 net/bluetooth/hci_core.c:4029 vhci_release+0x73/0xc0 drivers/bluetooth/hci_vhci.c:340 __fput+0x3fe/0x870 fs/file_table.c:280 task_work_run+0x146/0x1c0 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:32 [inline] do_exit+0x6fc/0x2580 kernel/exit.c:825 do_group_exit+0x168/0x2d0 kernel/exit.c:922 get_signal+0x16e0/0x20c0 kernel/signal.c:2868 arch_do_signal_or_restart+0x9c/0x730 arch/x86/kernel/signal.c:865 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x191/0x220 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:300 do_syscall_64+0x53/0xd0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f3020ed5709 Code: Unable to access opcode bytes at RIP 0x7f3020ed56df. RSP: 002b:00007f301e44c218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f3020fd9f68 RCX: 00007f3020ed5709 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f3020fd9f68 RBP: 00007f3020fd9f60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3020fd9f6c R13: 00007ffd4bbeab5f R14: 00007f301e44c300 R15: 0000000000022000 Allocated by task 26035: 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+0xdc/0x110 mm/kasan/common.c:513 kasan_kmalloc include/linux/kasan.h:264 [inline] __kmalloc+0x24d/0x370 mm/slub.c:4391 kmalloc include/linux/slab.h:596 [inline] sk_prot_alloc+0xf4/0x230 net/core/sock.c:1822 sk_alloc+0x35/0x300 net/core/sock.c:1875 pppol2tp_create+0x2e/0x1f0 net/l2tp/l2tp_ppp.c:505 pppox_create+0x129/0x1a0 drivers/net/ppp/pppox.c:129 __sock_create+0x580/0x8d0 net/socket.c:1464 sock_create net/socket.c:1515 [inline] __sys_socket+0x133/0x380 net/socket.c:1557 __do_sys_socket net/socket.c:1566 [inline] __se_sys_socket net/socket.c:1564 [inline] __x64_sys_socket+0x76/0x80 net/socket.c:1564 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Last potentially related work creation: kasan_save_stack+0x36/0x60 mm/kasan/common.c:38 kasan_record_aux_stack+0xf1/0x130 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:2987 [inline] call_rcu+0x1c4/0xa80 kernel/rcu/tree.c:3067 netlink_release+0x132d/0x1790 net/netlink/af_netlink.c:812 __sock_release net/socket.c:649 [inline] sock_close+0xd8/0x260 net/socket.c:1314 __fput+0x3fe/0x870 fs/file_table.c:280 task_work_run+0x146/0x1c0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x209/0x220 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:300 do_syscall_64+0x53/0xd0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae Second to last potentially related work creation: kasan_save_stack+0x36/0x60 mm/kasan/common.c:38 kasan_record_aux_stack+0xf1/0x130 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:2987 [inline] call_rcu+0x1c4/0xa80 kernel/rcu/tree.c:3067 netlink_release+0x132d/0x1790 net/netlink/af_netlink.c:812 __sock_release net/socket.c:649 [inline] sock_close+0xd8/0x260 net/socket.c:1314 __fput+0x3fe/0x870 fs/file_table.c:280 task_work_run+0x146/0x1c0 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:32 [inline] do_exit+0x6fc/0x2580 kernel/exit.c:825 do_group_exit+0x168/0x2d0 kernel/exit.c:922 __do_sys_exit_group+0x13/0x20 kernel/exit.c:933 __ia32_sys_exit_group+0x0/0x40 kernel/exit.c:931 __x64_sys_exit_group+0x37/0x40 kernel/exit.c:931 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff88801a651000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 128 bytes inside of 2048-byte region [ffff88801a651000, ffff88801a651800) The buggy address belongs to the page: page:ffffea0000699400 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88801a653000 pfn:0x1a650 head:ffffea0000699400 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0002168808 ffffea00021b3c08 ffff888011042000 raw: ffff88801a653000 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 6545, ts 145649193957, free_ts 145602488915 prep_new_page mm/page_alloc.c:2424 [inline] get_page_from_freelist+0x779/0xa30 mm/page_alloc.c:4153 __alloc_pages+0x255/0x580 mm/page_alloc.c:5375 alloc_slab_page mm/slub.c:1763 [inline] allocate_slab+0xcc/0x4d0 mm/slub.c:1900 new_slab mm/slub.c:1963 [inline] ___slab_alloc+0x41e/0xc40 mm/slub.c:2994 __slab_alloc mm/slub.c:3081 [inline] slab_alloc_node mm/slub.c:3172 [inline] slab_alloc mm/slub.c:3214 [inline] __kmalloc+0x2e9/0x370 mm/slub.c:4387 kmalloc include/linux/slab.h:596 [inline] kzalloc include/linux/slab.h:721 [inline] __register_sysctl_table+0xbf/0x12a0 fs/proc/proc_sysctl.c:1318 __devinet_sysctl_register+0x289/0x370 net/ipv4/devinet.c:2577 devinet_sysctl_register+0x139/0x1a0 net/ipv4/devinet.c:2617 inetdev_init+0x27f/0x4a0 net/ipv4/devinet.c:276 inetdev_event+0x1c5/0x1410 net/ipv4/devinet.c:1530 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xe7/0x170 kernel/notifier.c:391 call_netdevice_notifiers_info net/core/dev.c:1996 [inline] call_netdevice_notifiers_extack net/core/dev.c:2008 [inline] call_netdevice_notifiers net/core/dev.c:2022 [inline] register_netdevice+0x1624/0x1c30 net/core/dev.c:10330 veth_newlink+0x6bf/0xf80 drivers/net/veth.c:1695 __rtnl_newlink net/core/rtnetlink.c:3458 [inline] rtnl_newlink+0x14b3/0x1d10 net/core/rtnetlink.c:3506 rtnetlink_rcv_msg+0x934/0xe60 net/core/rtnetlink.c:5572 netlink_rcv_skb+0x200/0x470 net/netlink/af_netlink.c:2504 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1338 [inline] free_pcp_prepare+0xc29/0xd20 mm/page_alloc.c:1389 free_unref_page_prepare mm/page_alloc.c:3315 [inline] free_unref_page+0x7d/0x580 mm/page_alloc.c:3394 do_slab_free mm/slub.c:3471 [inline] ___cache_free+0xe6/0x120 mm/slub.c:3490 qlist_free_all mm/kasan/quarantine.c:165 [inline] kasan_quarantine_reduce+0x151/0x1c0 mm/kasan/quarantine.c:272 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc_node mm/slub.c:3206 [inline] slab_alloc mm/slub.c:3214 [inline] kmem_cache_alloc+0x1c3/0x300 mm/slub.c:3219 kmem_cache_zalloc include/linux/slab.h:711 [inline] __kernfs_new_node+0xdb/0x720 fs/kernfs/dir.c:585 kernfs_new_node+0x95/0x160 fs/kernfs/dir.c:647 __kernfs_create_file+0x45/0x2e0 fs/kernfs/file.c:985 sysfs_add_file_mode_ns+0x2fe/0x3d0 fs/sysfs/file.c:317 create_files fs/sysfs/group.c:64 [inline] internal_create_group+0x560/0xf10 fs/sysfs/group.c:149 internal_create_groups fs/sysfs/group.c:189 [inline] sysfs_create_groups+0x5d/0x130 fs/sysfs/group.c:215 device_add_groups drivers/base/core.c:2438 [inline] device_add_attrs drivers/base/core.c:2586 [inline] device_add+0xab8/0x16d0 drivers/base/core.c:3310 netdev_register_kobject+0x178/0x310 net/core/net-sysfs.c:1955 register_netdevice+0x12a1/0x1c30 net/core/dev.c:10299 veth_newlink+0x8f2/0xf80 drivers/net/veth.c:1726 Memory state around the buggy address: ffff88801a650f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801a651000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801a651080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801a651100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801a651180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================