usb 3-1: USB disconnect, device number 52 ================================================================== BUG: KASAN: double-free or invalid-free in slab_free mm/slub.c:3142 [inline] BUG: KASAN: double-free or invalid-free in kfree+0xbe/0x470 mm/slub.c:4123 CPU: 1 PID: 73 Comm: kworker/1:2 Not tainted 5.9.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: usb_hub_wq hub_event Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0xf6/0x16e lib/dump_stack.c:118 print_address_description.constprop.0+0x1c/0x210 mm/kasan/report.c:383 kasan_report_invalid_free+0x51/0x80 mm/kasan/report.c:477 __kasan_slab_free+0x122/0x130 mm/kasan/common.c:401 slab_free_hook mm/slub.c:1548 [inline] slab_free_freelist_hook+0x53/0x140 mm/slub.c:1581 slab_free mm/slub.c:3142 [inline] kfree+0xbe/0x470 mm/slub.c:4123 platform_device_release+0x64/0xf0 drivers/base/platform.c:426 device_release+0x71/0x200 drivers/base/core.c:1800 kobject_cleanup lib/kobject.c:704 [inline] kobject_release lib/kobject.c:735 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1c8/0x540 lib/kobject.c:752 put_device drivers/base/core.c:3029 [inline] klist_children_put+0x41/0x50 drivers/base/core.c:2382 klist_prev+0x2a2/0x510 lib/klist.c:362 prev_device drivers/base/core.c:3146 [inline] device_for_each_child_reverse+0xc0/0x180 drivers/base/core.c:3268 mfd_remove_devices+0x75/0xa0 drivers/mfd/mfd-core.c:391 vprbrd_disconnect+0x43/0xf0 drivers/mfd/viperboard.c:111 usb_unbind_interface+0x1d8/0x8d0 drivers/usb/core/driver.c:436 __device_release_driver+0x3c6/0x6f0 drivers/base/dd.c:1153 device_release_driver_internal drivers/base/dd.c:1184 [inline] device_release_driver+0x26/0x40 drivers/base/dd.c:1207 bus_remove_device+0x2eb/0x5a0 drivers/base/bus.c:533 device_del+0x481/0xd90 drivers/base/core.c:3107 usb_disable_device+0x387/0x930 drivers/usb/core/message.c:1245 usb_disconnect.cold+0x27d/0x780 drivers/usb/core/hub.c:2217 hub_port_connect drivers/usb/core/hub.c:5059 [inline] hub_port_connect_change drivers/usb/core/hub.c:5348 [inline] port_event drivers/usb/core/hub.c:5494 [inline] hub_event+0x1c93/0x4390 drivers/usb/core/hub.c:5576 process_one_work+0x94c/0x15f0 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x392/0x470 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Allocated by task 13016: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:461 slab_post_alloc_hook mm/slab.h:518 [inline] slab_alloc_node mm/slub.c:2892 [inline] slab_alloc mm/slub.c:2900 [inline] __kmalloc_track_caller+0xf6/0x270 mm/slub.c:4463 kmemdup+0x23/0x50 mm/util.c:127 kmemdup include/linux/string.h:479 [inline] mfd_add_device+0x112/0x1190 drivers/mfd/mfd-core.c:191 mfd_add_devices+0xdb/0x170 drivers/mfd/mfd-core.c:339 mfd_add_hotplug_devices include/linux/mfd/core.h:152 [inline] vprbrd_probe.cold+0x107/0x181 drivers/mfd/viperboard.c:89 usb_probe_interface+0x315/0x7f0 drivers/usb/core/driver.c:374 really_probe+0x291/0xde0 drivers/base/dd.c:553 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:738 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:844 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431 __device_attach+0x228/0x4a0 drivers/base/dd.c:912 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xb51/0x1c70 drivers/base/core.c:2930 usb_set_configuration+0xf05/0x18a0 drivers/usb/core/message.c:2032 usb_generic_driver_probe+0xba/0xf2 drivers/usb/core/generic.c:239 usb_probe_device+0xd9/0x250 drivers/usb/core/driver.c:272 really_probe+0x291/0xde0 drivers/base/dd.c:553 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:738 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:844 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431 __device_attach+0x228/0x4a0 drivers/base/dd.c:912 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xb51/0x1c70 drivers/base/core.c:2930 usb_new_device.cold+0x71d/0xfd4 drivers/usb/core/hub.c:2554 hub_port_connect drivers/usb/core/hub.c:5208 [inline] hub_port_connect_change drivers/usb/core/hub.c:5348 [inline] port_event drivers/usb/core/hub.c:5494 [inline] hub_event+0x2361/0x4390 drivers/usb/core/hub.c:5576 process_one_work+0x94c/0x15f0 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x392/0x470 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Freed by task 73: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track+0x1c/0x30 mm/kasan/common.c:56 kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:355 __kasan_slab_free+0xf3/0x130 mm/kasan/common.c:422 slab_free_hook mm/slub.c:1548 [inline] slab_free_freelist_hook+0x53/0x140 mm/slub.c:1581 slab_free mm/slub.c:3142 [inline] kfree+0xbe/0x470 mm/slub.c:4123 mfd_remove_devices_fn drivers/mfd/mfd-core.c:373 [inline] mfd_remove_devices_fn+0xf9/0x140 drivers/mfd/mfd-core.c:355 device_for_each_child_reverse+0x110/0x180 drivers/base/core.c:3269 mfd_remove_devices+0x75/0xa0 drivers/mfd/mfd-core.c:391 vprbrd_disconnect+0x43/0xf0 drivers/mfd/viperboard.c:111 usb_unbind_interface+0x1d8/0x8d0 drivers/usb/core/driver.c:436 __device_release_driver+0x3c6/0x6f0 drivers/base/dd.c:1153 device_release_driver_internal drivers/base/dd.c:1184 [inline] device_release_driver+0x26/0x40 drivers/base/dd.c:1207 bus_remove_device+0x2eb/0x5a0 drivers/base/bus.c:533 device_del+0x481/0xd90 drivers/base/core.c:3107 usb_disable_device+0x387/0x930 drivers/usb/core/message.c:1245 usb_disconnect.cold+0x27d/0x780 drivers/usb/core/hub.c:2217 hub_port_connect drivers/usb/core/hub.c:5059 [inline] hub_port_connect_change drivers/usb/core/hub.c:5348 [inline] port_event drivers/usb/core/hub.c:5494 [inline] hub_event+0x1c93/0x4390 drivers/usb/core/hub.c:5576 process_one_work+0x94c/0x15f0 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x392/0x470 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Last call_rcu(): kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_record_aux_stack+0x9e/0xb0 mm/kasan/generic.c:346 __call_rcu kernel/rcu/tree.c:2894 [inline] call_rcu+0xe9/0xb90 kernel/rcu/tree.c:2968 neigh_parms_release net/core/neighbour.c:1662 [inline] neigh_parms_release+0x1e3/0x260 net/core/neighbour.c:1652 addrconf_ifdown.isra.0+0xfdd/0x1590 net/ipv6/addrconf.c:3860 addrconf_notify+0x772/0x2370 net/ipv6/addrconf.c:3641 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2033 call_netdevice_notifiers_extack net/core/dev.c:2045 [inline] call_netdevice_notifiers net/core/dev.c:2059 [inline] rollback_registered_many+0x7a6/0x1230 net/core/dev.c:9281 unregister_netdevice_many.part.0+0x1a/0x2f0 net/core/dev.c:10426 unregister_netdevice_many+0x36/0x50 net/core/dev.c:10425 ieee80211_remove_interfaces+0x37e/0x7a0 net/mac80211/iface.c:2047 ieee80211_unregister_hw+0x47/0x210 net/mac80211/main.c:1366 rtl_usb_disconnect+0x582/0x6e0 drivers/net/wireless/realtek/rtlwifi/usb.c:1109 usb_unbind_interface+0x1d8/0x8d0 drivers/usb/core/driver.c:436 __device_release_driver+0x3c6/0x6f0 drivers/base/dd.c:1153 device_release_driver_internal drivers/base/dd.c:1184 [inline] device_release_driver+0x26/0x40 drivers/base/dd.c:1207 bus_remove_device+0x2eb/0x5a0 drivers/base/bus.c:533 device_del+0x481/0xd90 drivers/base/core.c:3107 usb_disable_device+0x387/0x930 drivers/usb/core/message.c:1245 usb_disconnect.cold+0x27d/0x780 drivers/usb/core/hub.c:2217 hub_port_connect drivers/usb/core/hub.c:5059 [inline] hub_port_connect_change drivers/usb/core/hub.c:5348 [inline] port_event drivers/usb/core/hub.c:5494 [inline] hub_event+0x1c93/0x4390 drivers/usb/core/hub.c:5576 process_one_work+0x94c/0x15f0 kernel/workqueue.c:2269 process_scheduled_works kernel/workqueue.c:2331 [inline] worker_thread+0x82b/0x1120 kernel/workqueue.c:2417 kthread+0x392/0x470 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 The buggy address belongs to the object at ffff8881cacfc600 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 0 bytes inside of 192-byte region [ffff8881cacfc600, ffff8881cacfc6c0) The buggy address belongs to the page: page:00000000aa3e1068 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1cacfc flags: 0x200000000000200(slab) raw: 0200000000000200 ffffea0007685500 0000000300000002 ffff8881da041500 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881cacfc500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881cacfc580: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff8881cacfc600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881cacfc680: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8881cacfc700: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================