usb 1-1: USB disconnect, device number 2 asix 1-1:0.0 eth1: unregister 'asix' usb-dummy_hcd.0-1, ASIX AX88172A USB 2.0 Ethernet ================================================================== BUG: KASAN: use-after-free in ax88172a_remove_mdio drivers/net/usb/ax88172a.c:112 [inline] BUG: KASAN: use-after-free in ax88172a_unbind+0x6a/0xc0 drivers/net/usb/ax88172a.c:263 Read of size 8 at addr ffff88809eca9800 by task kworker/1:0/17 CPU: 1 PID: 17 Comm: kworker/1:0 Not tainted 5.7.0-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+0x1e9/0x30e lib/dump_stack.c:118 print_address_description+0x66/0x5a0 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report+0x132/0x1d0 mm/kasan/report.c:530 ax88172a_remove_mdio drivers/net/usb/ax88172a.c:112 [inline] ax88172a_unbind+0x6a/0xc0 drivers/net/usb/ax88172a.c:263 usbnet_disconnect+0x14b/0x340 drivers/net/usb/usbnet.c:1618 usb_unbind_interface+0x1d2/0x840 drivers/usb/core/driver.c:436 __device_release_driver drivers/base/dd.c:1110 [inline] device_release_driver_internal+0x507/0x7a0 drivers/base/dd.c:1141 bus_remove_device+0x2eb/0x360 drivers/base/bus.c:533 device_del+0x822/0x1160 drivers/base/core.c:2734 usb_disable_device+0x3ee/0xc80 drivers/usb/core/message.c:1245 usb_disconnect+0x346/0x880 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+0x1c18/0x4cb0 drivers/usb/core/hub.c:5576 process_one_work+0x76e/0xfd0 kernel/workqueue.c:2268 worker_thread+0xa7f/0x1450 kernel/workqueue.c:2414 kthread+0x353/0x380 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351 Allocated by task 12: save_stack mm/kasan/common.c:48 [inline] set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc+0x103/0x140 mm/kasan/common.c:494 kmem_cache_alloc_trace+0x234/0x300 mm/slab.c:3551 kmalloc include/linux/slab.h:555 [inline] kzalloc include/linux/slab.h:669 [inline] ax88172a_bind+0x70/0x7f0 drivers/net/usb/ax88172a.c:180 usbnet_probe+0xaba/0x26f0 drivers/net/usb/usbnet.c:1737 usb_probe_interface+0x614/0xac0 drivers/usb/core/driver.c:374 really_probe+0x761/0xf60 drivers/base/dd.c:524 driver_probe_device+0xe6/0x230 drivers/base/dd.c:697 bus_for_each_drv+0x108/0x170 drivers/base/bus.c:431 __device_attach+0x20c/0x3a0 drivers/base/dd.c:870 bus_probe_device+0xb8/0x1f0 drivers/base/bus.c:491 device_add+0x1828/0x1ba0 drivers/base/core.c:2557 usb_set_configuration+0x19d2/0x1f20 drivers/usb/core/message.c:2032 usb_generic_driver_probe+0x82/0x140 drivers/usb/core/generic.c:241 usb_probe_device+0x12d/0x1d0 drivers/usb/core/driver.c:272 really_probe+0x761/0xf60 drivers/base/dd.c:524 driver_probe_device+0xe6/0x230 drivers/base/dd.c:697 bus_for_each_drv+0x108/0x170 drivers/base/bus.c:431 __device_attach+0x20c/0x3a0 drivers/base/dd.c:870 bus_probe_device+0xb8/0x1f0 drivers/base/bus.c:491 device_add+0x1828/0x1ba0 drivers/base/core.c:2557 usb_new_device+0xcc3/0x1650 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+0x2823/0x4cb0 drivers/usb/core/hub.c:5576 process_one_work+0x76e/0xfd0 kernel/workqueue.c:2268 worker_thread+0xa7f/0x1450 kernel/workqueue.c:2414 kthread+0x353/0x380 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351 Freed by task 12: save_stack mm/kasan/common.c:48 [inline] set_track mm/kasan/common.c:56 [inline] kasan_set_free_info mm/kasan/common.c:316 [inline] __kasan_slab_free+0x114/0x170 mm/kasan/common.c:455 __cache_free mm/slab.c:3426 [inline] kfree+0x10a/0x220 mm/slab.c:3757 ax88172a_bind+0x260/0x7f0 drivers/net/usb/ax88172a.c:239 usbnet_probe+0xaba/0x26f0 drivers/net/usb/usbnet.c:1737 usb_probe_interface+0x614/0xac0 drivers/usb/core/driver.c:374 really_probe+0x761/0xf60 drivers/base/dd.c:524 driver_probe_device+0xe6/0x230 drivers/base/dd.c:697 bus_for_each_drv+0x108/0x170 drivers/base/bus.c:431 __device_attach+0x20c/0x3a0 drivers/base/dd.c:870 bus_probe_device+0xb8/0x1f0 drivers/base/bus.c:491 device_add+0x1828/0x1ba0 drivers/base/core.c:2557 usb_set_configuration+0x19d2/0x1f20 drivers/usb/core/message.c:2032 usb_generic_driver_probe+0x82/0x140 drivers/usb/core/generic.c:241 usb_probe_device+0x12d/0x1d0 drivers/usb/core/driver.c:272 really_probe+0x761/0xf60 drivers/base/dd.c:524 driver_probe_device+0xe6/0x230 drivers/base/dd.c:697 bus_for_each_drv+0x108/0x170 drivers/base/bus.c:431 __device_attach+0x20c/0x3a0 drivers/base/dd.c:870 bus_probe_device+0xb8/0x1f0 drivers/base/bus.c:491 device_add+0x1828/0x1ba0 drivers/base/core.c:2557 usb_new_device+0xcc3/0x1650 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+0x2823/0x4cb0 drivers/usb/core/hub.c:5576 process_one_work+0x76e/0xfd0 kernel/workqueue.c:2268 worker_thread+0xa7f/0x1450 kernel/workqueue.c:2414 kthread+0x353/0x380 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351 The buggy address belongs to the object at ffff88809eca9800 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 0 bytes inside of 64-byte region [ffff88809eca9800, ffff88809eca9840) The buggy address belongs to the page: page:ffffea00027b2a40 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88809eca9b00 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea00025c8248 ffffea00027e9988 ffff8880aa400380 raw: ffff88809eca9b00 ffff88809eca9000 000000010000001e 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809eca9700: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff88809eca9780: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc >ffff88809eca9800: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff88809eca9880: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff88809eca9900: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ==================================================================