================================================================== 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:116 [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:726 [inline] BUG: KASAN: use-after-free in sco_sock_timeout+0x64/0x290 net/bluetooth/sco.c:89 Write of size 4 at addr ffff888022bd7080 by task kworker/1:4/3762 CPU: 1 PID: 3762 Comm: kworker/1:4 Not tainted 5.18.0-rc5-syzkaller-00106-g0f5d752b1395 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Workqueue: events sco_sock_timeout Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0xeb/0x495 mm/kasan/report.c:313 print_report mm/kasan/report.c:429 [inline] kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x13d/0x180 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:116 [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:726 [inline] sco_sock_timeout+0x64/0x290 net/bluetooth/sco.c:89 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Allocated by task 7373: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc mm/kasan/common.c:515 [inline] ____kasan_kmalloc mm/kasan/common.c:474 [inline] __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:524 kmalloc_node include/linux/slab.h:604 [inline] kzalloc_node include/linux/slab.h:725 [inline] qdisc_alloc+0xac/0xa10 net/sched/sch_generic.c:941 qdisc_create_dflt+0x71/0x4b0 net/sched/sch_generic.c:1000 mq_init+0x34c/0x4a0 net/sched/sch_mq.c:90 qdisc_create_dflt+0x101/0x4b0 net/sched/sch_generic.c:1007 attach_default_qdiscs net/sched/sch_generic.c:1171 [inline] dev_activate+0xa74/0xcd0 net/sched/sch_generic.c:1224 __dev_open+0x388/0x4d0 net/core/dev.c:1434 __dev_change_flags+0x583/0x750 net/core/dev.c:8433 dev_change_flags+0x93/0x170 net/core/dev.c:8504 dev_ifsioc+0xb48/0x1120 net/core/dev_ioctl.c:325 dev_ioctl+0x1b9/0xed0 net/core/dev_ioctl.c:586 sock_do_ioctl+0x15a/0x230 net/socket.c:1136 compat_sock_ioctl_trans net/socket.c:3329 [inline] compat_sock_ioctl+0x3c1/0x660 net/socket.c:3354 __do_compat_sys_ioctl+0x1c7/0x290 fs/ioctl.c:968 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c Last potentially related work creation: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 __kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348 call_rcu+0x99/0x790 kernel/rcu/tree.c:3074 qdisc_put+0xcd/0xe0 net/sched/sch_generic.c:1094 shutdown_scheduler_queue net/sched/sch_generic.c:1472 [inline] netdev_for_each_tx_queue include/linux/netdevice.h:2385 [inline] dev_shutdown+0x11a/0x520 net/sched/sch_generic.c:1478 unregister_netdevice_many+0x7d3/0x1890 net/core/dev.c:10738 unregister_netdevice_queue net/core/dev.c:10679 [inline] unregister_netdevice_queue+0x2dd/0x3c0 net/core/dev.c:10669 unregister_netdevice include/linux/netdevice.h:2954 [inline] __tun_detach+0x10b2/0x13e0 drivers/net/tun.c:676 tun_detach drivers/net/tun.c:693 [inline] tun_chr_close+0xc4/0x180 drivers/net/tun.c:3445 __fput+0x277/0x9d0 fs/file_table.c:317 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:169 [inline] exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:294 __do_fast_syscall_32+0x72/0xf0 arch/x86/entry/common.c:181 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c The buggy address belongs to the object at ffff888022bd7000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 128 bytes inside of 2048-byte region [ffff888022bd7000, ffff888022bd7800) The buggy address belongs to the physical page: page:ffffea00008af400 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888022bd1000 pfn:0x22bd0 head:ffffea00008af400 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0000637008 ffffea0000808c08 ffff888010c42f00 raw: ffff888022bd1000 0000000000080006 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 3717, tgid 3717 (syz-executor.2), ts 256644898120, free_ts 255518387144 prep_new_page mm/page_alloc.c:2441 [inline] get_page_from_freelist+0xba2/0x3e00 mm/page_alloc.c:4182 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5408 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2272 alloc_slab_page mm/slub.c:1799 [inline] allocate_slab+0x26c/0x3c0 mm/slub.c:1944 new_slab mm/slub.c:2004 [inline] ___slab_alloc+0x8df/0xf20 mm/slub.c:3005 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3092 slab_alloc_node mm/slub.c:3183 [inline] slab_alloc mm/slub.c:3225 [inline] __kmalloc+0x318/0x350 mm/slub.c:4410 kmalloc include/linux/slab.h:586 [inline] kzalloc include/linux/slab.h:714 [inline] __register_sysctl_table+0x112/0x1090 fs/proc/proc_sysctl.c:1335 __addrconf_sysctl_register+0x1db/0x3d0 net/ipv6/addrconf.c:7052 addrconf_sysctl_register net/ipv6/addrconf.c:7099 [inline] addrconf_sysctl_register+0x139/0x1d0 net/ipv6/addrconf.c:7088 ipv6_add_dev+0xa16/0x12a0 net/ipv6/addrconf.c:450 addrconf_notify+0x614/0x1ba0 net/ipv6/addrconf.c:3521 notifier_call_chain+0xb5/0x200 kernel/notifier.c:84 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1938 call_netdevice_notifiers_extack net/core/dev.c:1976 [inline] call_netdevice_notifiers net/core/dev.c:1990 [inline] register_netdevice+0x109e/0x15b0 net/core/dev.c:9994 veth_newlink+0x405/0xa90 drivers/net/veth.c:1764 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1356 [inline] free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1406 free_unref_page_prepare mm/page_alloc.c:3328 [inline] free_unref_page+0x19/0x6a0 mm/page_alloc.c:3423 qlink_free mm/kasan/quarantine.c:157 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:446 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:749 [inline] slab_alloc_node mm/slub.c:3217 [inline] slab_alloc mm/slub.c:3225 [inline] kmem_cache_alloc_trace+0x26d/0x3f0 mm/slub.c:3256 kmalloc include/linux/slab.h:581 [inline] kzalloc include/linux/slab.h:714 [inline] kobject_uevent_env+0x235/0x1660 lib/kobject_uevent.c:524 __kobject_del+0x169/0x200 lib/kobject.c:585 kobject_cleanup lib/kobject.c:664 [inline] kobject_release lib/kobject.c:704 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x2b6/0x540 lib/kobject.c:721 netdev_queue_update_kobjects+0x367/0x4e0 net/core/net-sysfs.c:1720 netif_set_real_num_tx_queues+0x1b6/0x770 net/core/dev.c:2886 veth_init_queues+0xdd/0x190 drivers/net/veth.c:1686 veth_newlink+0x5ef/0xa90 drivers/net/veth.c:1807 __rtnl_newlink+0x107f/0x1760 net/core/rtnetlink.c:3483 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3531 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5993 Memory state around the buggy address: ffff888022bd6f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888022bd7000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888022bd7080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888022bd7100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888022bd7180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================