usb 5-1: USB disconnect, device number 13
asix 5-1:0.0 eth5: 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 ffff8880a7aed280 by task kworker/1:7/2525

CPU: 1 PID: 2525 Comm: kworker/1:7 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+0x18f/0x20d lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xae/0x436 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report.cold+0x1f/0x37 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+0x2dc/0x4a0 drivers/base/bus.c:533
 device_del+0x47c/0xd20 drivers/base/core.c:2877
 usb_disable_device+0x361/0x800 drivers/usb/core/message.c:1245
 usb_disconnect.cold+0x251/0x742 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+0x1965/0x3e40 drivers/usb/core/hub.c:5576
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293

Allocated by task 3804:
 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
 kmem_cache_alloc_trace+0x14f/0x2d0 mm/slab.c:3551
 kmalloc include/linux/slab.h:555 [inline]
 kzalloc include/linux/slab.h:669 [inline]
 ax88172a_bind+0xa3/0x760 drivers/net/usb/ax88172a.c:180
 usbnet_probe+0xb3e/0x2690 drivers/net/usb/usbnet.c:1737
 usb_probe_interface+0x2f7/0x780 drivers/usb/core/driver.c:374
 really_probe+0x282/0x8a0 drivers/base/dd.c:520
 driver_probe_device+0xfe/0x1d0 drivers/base/dd.c:696
 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:802
 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431
 __device_attach+0x28d/0x3f0 drivers/base/dd.c:868
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
 device_add+0xacf/0x1be0 drivers/base/core.c:2700
 usb_set_configuration+0xef6/0x17a0 drivers/usb/core/message.c:2032
 usb_generic_driver_probe+0xba/0xf2 drivers/usb/core/generic.c:241
 usb_probe_device+0xc6/0x210 drivers/usb/core/driver.c:272
 really_probe+0x282/0x8a0 drivers/base/dd.c:520
 driver_probe_device+0xfe/0x1d0 drivers/base/dd.c:696
 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:802
 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431
 __device_attach+0x28d/0x3f0 drivers/base/dd.c:868
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
 device_add+0xacf/0x1be0 drivers/base/core.c:2700
 usb_new_device.cold+0x748/0x103b 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+0x2033/0x3e40 drivers/usb/core/hub.c:5576
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293

Freed by task 3804:
 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+0xf5/0x140 mm/kasan/common.c:455
 __cache_free mm/slab.c:3426 [inline]
 kfree+0x103/0x2c0 mm/slab.c:3757
 ax88172a_bind.cold+0xad/0x1d4 drivers/net/usb/ax88172a.c:239
 usbnet_probe+0xb3e/0x2690 drivers/net/usb/usbnet.c:1737
 usb_probe_interface+0x2f7/0x780 drivers/usb/core/driver.c:374
 really_probe+0x282/0x8a0 drivers/base/dd.c:520
 driver_probe_device+0xfe/0x1d0 drivers/base/dd.c:696
 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:802
 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431
 __device_attach+0x28d/0x3f0 drivers/base/dd.c:868
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
 device_add+0xacf/0x1be0 drivers/base/core.c:2700
 usb_set_configuration+0xef6/0x17a0 drivers/usb/core/message.c:2032
 usb_generic_driver_probe+0xba/0xf2 drivers/usb/core/generic.c:241
 usb_probe_device+0xc6/0x210 drivers/usb/core/driver.c:272
 really_probe+0x282/0x8a0 drivers/base/dd.c:520
 driver_probe_device+0xfe/0x1d0 drivers/base/dd.c:696
 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:802
 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431
 __device_attach+0x28d/0x3f0 drivers/base/dd.c:868
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
 device_add+0xacf/0x1be0 drivers/base/core.c:2700
 usb_new_device.cold+0x748/0x103b 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+0x2033/0x3e40 drivers/usb/core/hub.c:5576
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293

The buggy address belongs to the object at ffff8880a7aed280
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 0 bytes inside of
 64-byte region [ffff8880a7aed280, ffff8880a7aed2c0)
The buggy address belongs to the page:
page:ffffea00029ebb40 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880a7aedd00
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea00025b3c08 ffffea0002270f48 ffff8880aa000380
raw: ffff8880a7aedd00 ffff8880a7aed000 0000000100000018 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a7aed180: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff8880a7aed200: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff8880a7aed280: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
                   ^
 ffff8880a7aed300: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
 ffff8880a7aed380: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
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