asix 1-1:0.0 eth1: register 'asix' at usb-dummy_hcd.0-1, ASIX AX88172A USB 2.0 Ethernet, 0a:90:68:08:3e:b1 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+0x76/0xf5 drivers/net/usb/ax88172a.c:263 Read of size 8 at addr ffff8881cb73b100 by task kworker/0:1/12 CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.8.0-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.cold+0xd3/0x415 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+0x76/0xf5 drivers/net/usb/ax88172a.c:263 usbnet_disconnect+0x145/0x270 drivers/net/usb/usbnet.c:1618 usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:436 __device_release_driver drivers/base/dd.c:1113 [inline] device_release_driver_internal+0x432/0x500 drivers/base/dd.c:1144 bus_remove_device+0x2eb/0x5a0 drivers/base/bus.c:533 device_del+0x481/0xd30 drivers/base/core.c:2857 usb_disable_device+0x23d/0x790 drivers/usb/core/message.c:1245 usb_disconnect+0x293/0x900 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+0x1abf/0x43c0 drivers/usb/core/hub.c:5576 process_one_work+0x965/0x1620 kernel/workqueue.c:2269 worker_thread+0x96/0xe10 kernel/workqueue.c:2415 kthread+0x352/0x460 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 Allocated by task 12: save_stack+0x1b/0x40 mm/kasan/common.c:48 set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc mm/kasan/common.c:494 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:467 kmalloc include/linux/slab.h:555 [inline] kzalloc include/linux/slab.h:669 [inline] ax88172a_bind+0xa4/0x856 drivers/net/usb/ax88172a.c:180 usbnet_probe+0xb47/0x2700 drivers/net/usb/usbnet.c:1737 usb_probe_interface+0x310/0x800 drivers/usb/core/driver.c:374 really_probe+0x290/0xac0 drivers/base/dd.c:525 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:701 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:807 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:431 __device_attach+0x21a/0x390 drivers/base/dd.c:873 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xb2b/0x1940 drivers/base/core.c:2680 usb_set_configuration+0xed4/0x1850 drivers/usb/core/message.c:2032 usb_generic_driver_probe+0x9d/0xe0 drivers/usb/core/generic.c:241 usb_probe_device+0xd9/0x230 drivers/usb/core/driver.c:272 really_probe+0x290/0xac0 drivers/base/dd.c:525 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:701 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:807 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:431 __device_attach+0x21a/0x390 drivers/base/dd.c:873 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xb2b/0x1940 drivers/base/core.c:2680 usb_new_device.cold+0x5a2/0xfd9 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+0x226d/0x43c0 drivers/usb/core/hub.c:5576 process_one_work+0x965/0x1620 kernel/workqueue.c:2269 worker_thread+0x96/0xe10 kernel/workqueue.c:2415 kthread+0x352/0x460 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 Freed by task 12: 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+0x117/0x160 mm/kasan/common.c:455 slab_free_hook mm/slub.c:1474 [inline] slab_free_freelist_hook mm/slub.c:1507 [inline] slab_free mm/slub.c:3072 [inline] kfree+0xd5/0x300 mm/slub.c:4063 ax88172a_bind.cold+0x49/0x1d0 drivers/net/usb/ax88172a.c:239 usbnet_probe+0xb47/0x2700 drivers/net/usb/usbnet.c:1737 usb_probe_interface+0x310/0x800 drivers/usb/core/driver.c:374 really_probe+0x290/0xac0 drivers/base/dd.c:525 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:701 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:807 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:431 __device_attach+0x21a/0x390 drivers/base/dd.c:873 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xb2b/0x1940 drivers/base/core.c:2680 usb_set_configuration+0xed4/0x1850 drivers/usb/core/message.c:2032 usb_generic_driver_probe+0x9d/0xe0 drivers/usb/core/generic.c:241 usb_probe_device+0xd9/0x230 drivers/usb/core/driver.c:272 really_probe+0x290/0xac0 drivers/base/dd.c:525 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:701 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:807 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:431 __device_attach+0x21a/0x390 drivers/base/dd.c:873 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xb2b/0x1940 drivers/base/core.c:2680 usb_new_device.cold+0x5a2/0xfd9 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+0x226d/0x43c0 drivers/usb/core/hub.c:5576 process_one_work+0x965/0x1620 kernel/workqueue.c:2269 worker_thread+0x96/0xe10 kernel/workqueue.c:2415 kthread+0x352/0x460 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 The buggy address belongs to the object at ffff8881cb73b100 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 0 bytes inside of 64-byte region [ffff8881cb73b100, ffff8881cb73b140) The buggy address belongs to the page: page:ffffea00072dcec0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 flags: 0x200000000000200(slab) raw: 0200000000000200 ffffea0007629280 0000001700000003 ffff8881da003180 raw: 0000000000000000 0000000080200020 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881cb73b000: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8881cb73b080: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc >ffff8881cb73b100: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff8881cb73b180: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8881cb73b200: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================