asix 5-1:0.0 eth1: unregister 'asix' usb-dummy_hcd.4-1, ASIX AX88172A USB 2.0 Ethernet
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BUG: KASAN: use-after-free in ax88172a_remove_mdio drivers/net/usb/ax88172a.c:112 [inline]
BUG: KASAN: use-after-free in ax88172a_unbind+0x4d/0xe7 drivers/net/usb/ax88172a.c:263
Read of size 8 at addr ffff8881d5bf9b80 by task kworker/1:1/21

CPU: 1 PID: 21 Comm: kworker/1:1 Not tainted 5.8.0-rc6-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+0x1a/0x210 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report.cold+0x37/0x7c mm/kasan/report.c:530
 ax88172a_remove_mdio drivers/net/usb/ax88172a.c:112 [inline]
 ax88172a_unbind+0x4d/0xe7 drivers/net/usb/ax88172a.c:263
 usbnet_disconnect+0x145/0x270 drivers/net/usb/usbnet.c:1618
 usb_unbind_interface+0x1d8/0x8d0 drivers/usb/core/driver.c:436
 __device_release_driver+0x3b7/0x6e0 drivers/base/dd.c:1108
 device_release_driver_internal drivers/base/dd.c:1139 [inline]
 device_release_driver+0x26/0x40 drivers/base/dd.c:1162
 bus_remove_device+0x2eb/0x5a0 drivers/base/bus.c:533
 device_del+0x47c/0xd20 drivers/base/core.c:2877
 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:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293

Allocated by task 21:
 save_stack+0x1b/0x40 mm/kasan/common.c:48
 set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:494
 kmalloc include/linux/slab.h:555 [inline]
 kzalloc include/linux/slab.h:669 [inline]
 ax88172a_bind+0xa3/0x860 drivers/net/usb/ax88172a.c:180
 usbnet_probe+0xb47/0x2720 drivers/net/usb/usbnet.c:1737
 usb_probe_interface+0x315/0x7f0 drivers/usb/core/driver.c:374
 really_probe+0x291/0xc90 drivers/base/dd.c:520
 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:696
 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:802
 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431
 __device_attach+0x28d/0x430 drivers/base/dd.c:868
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
 device_add+0xb09/0x1c10 drivers/base/core.c:2700
 usb_set_configuration+0xf05/0x18a0 drivers/usb/core/message.c:2032
 usb_generic_driver_probe+0xba/0xf2 drivers/usb/core/generic.c:241
 usb_probe_device+0xd9/0x250 drivers/usb/core/driver.c:272
 really_probe+0x291/0xc90 drivers/base/dd.c:520
 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:696
 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:802
 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431
 __device_attach+0x28d/0x430 drivers/base/dd.c:868
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
 device_add+0xb09/0x1c10 drivers/base/core.c:2700
 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
 process_scheduled_works kernel/workqueue.c:2331 [inline]
 worker_thread+0x82b/0x1120 kernel/workqueue.c:2417
 kthread+0x392/0x470 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293

Freed by task 21:
 save_stack+0x1b/0x40 mm/kasan/common.c:48
 set_track mm/kasan/common.c:56 [inline]
 kasan_set_free_info mm/kasan/common.c:316 [inline]
 __kasan_slab_free+0x116/0x160 mm/kasan/common.c:455
 slab_free_hook mm/slub.c:1474 [inline]
 slab_free_freelist_hook+0x53/0x140 mm/slub.c:1507
 slab_free mm/slub.c:3072 [inline]
 kfree+0xbc/0x2c0 mm/slub.c:4052
 ax88172a_bind.cold+0xac/0x1d0 drivers/net/usb/ax88172a.c:239
 usbnet_probe+0xb47/0x2720 drivers/net/usb/usbnet.c:1737
 usb_probe_interface+0x315/0x7f0 drivers/usb/core/driver.c:374
 really_probe+0x291/0xc90 drivers/base/dd.c:520
 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:696
 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:802
 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431
 __device_attach+0x28d/0x430 drivers/base/dd.c:868
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
 device_add+0xb09/0x1c10 drivers/base/core.c:2700
 usb_set_configuration+0xf05/0x18a0 drivers/usb/core/message.c:2032
 usb_generic_driver_probe+0xba/0xf2 drivers/usb/core/generic.c:241
 usb_probe_device+0xd9/0x250 drivers/usb/core/driver.c:272
 really_probe+0x291/0xc90 drivers/base/dd.c:520
 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:696
 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:802
 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431
 __device_attach+0x28d/0x430 drivers/base/dd.c:868
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
 device_add+0xb09/0x1c10 drivers/base/core.c:2700
 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
 process_scheduled_works kernel/workqueue.c:2331 [inline]
 worker_thread+0x82b/0x1120 kernel/workqueue.c:2417
 kthread+0x392/0x470 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293

The buggy address belongs to the object at ffff8881d5bf9b80
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 0 bytes inside of
 64-byte region [ffff8881d5bf9b80, ffff8881d5bf9bc0)
The buggy address belongs to the page:
page:ffffea000756fe40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x200000000000200(slab)
raw: 0200000000000200 dead000000000100 dead000000000122 ffff8881da003180
raw: 0000000000000000 0000000000200020 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881d5bf9a80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff8881d5bf9b00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff8881d5bf9b80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
                   ^
 ffff8881d5bf9c00: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
 ffff8881d5bf9c80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
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