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+0x76/0xe7 drivers/net/usb/ax88172a.c:263 Read of size 8 at addr ffff8880954aa980 by task kworker/1:2/2479 CPU: 1 PID: 2479 Comm: kworker/1:2 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+0x188/0x20d lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xd3/0x413 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+0x76/0xe7 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:1110 [inline] device_release_driver_internal+0x432/0x500 drivers/base/dd.c:1141 bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:533 device_del+0x481/0xd30 drivers/base/core.c:2734 usb_disable_device+0x211/0x690 drivers/usb/core/message.c:1245 usb_disconnect+0x284/0x8d0 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+0x17ca/0x38f0 drivers/usb/core/hub.c:5576 process_one_work+0x965/0x16a0 kernel/workqueue.c:2268 worker_thread+0x96/0xe20 kernel/workqueue.c:2414 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351 Allocated by task 2499: 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 kmem_cache_alloc_trace+0x153/0x7d0 mm/slab.c:3551 kmalloc include/linux/slab.h:555 [inline] kzalloc include/linux/slab.h:669 [inline] ax88172a_bind+0xa3/0x751 drivers/net/usb/ax88172a.c:180 usbnet_probe+0xb36/0x2600 drivers/net/usb/usbnet.c:1737 usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:374 really_probe+0x281/0x6d0 drivers/base/dd.c:520 driver_probe_device+0x104/0x210 drivers/base/dd.c:697 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:804 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:431 __device_attach+0x21a/0x360 drivers/base/dd.c:870 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0x132d/0x1c10 drivers/base/core.c:2557 usb_set_configuration+0xec5/0x1740 drivers/usb/core/message.c:2032 usb_generic_driver_probe+0x9d/0xe0 drivers/usb/core/generic.c:241 usb_probe_device+0xc6/0x1f0 drivers/usb/core/driver.c:272 really_probe+0x281/0x6d0 drivers/base/dd.c:520 driver_probe_device+0x104/0x210 drivers/base/dd.c:697 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:804 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:431 __device_attach+0x21a/0x360 drivers/base/dd.c:870 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0x132d/0x1c10 drivers/base/core.c:2557 usb_new_device.cold+0x753/0x103d 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+0x1eca/0x38f0 drivers/usb/core/hub.c:5576 process_one_work+0x965/0x16a0 kernel/workqueue.c:2268 worker_thread+0x96/0xe20 kernel/workqueue.c:2414 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351 Freed by task 2499: 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+0xf7/0x140 mm/kasan/common.c:455 __cache_free mm/slab.c:3426 [inline] kfree+0x109/0x2b0 mm/slab.c:3757 ax88172a_bind.cold+0xad/0x1df drivers/net/usb/ax88172a.c:239 usbnet_probe+0xb36/0x2600 drivers/net/usb/usbnet.c:1737 usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:374 really_probe+0x281/0x6d0 drivers/base/dd.c:520 driver_probe_device+0x104/0x210 drivers/base/dd.c:697 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:804 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:431 __device_attach+0x21a/0x360 drivers/base/dd.c:870 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0x132d/0x1c10 drivers/base/core.c:2557 usb_set_configuration+0xec5/0x1740 drivers/usb/core/message.c:2032 usb_generic_driver_probe+0x9d/0xe0 drivers/usb/core/generic.c:241 usb_probe_device+0xc6/0x1f0 drivers/usb/core/driver.c:272 really_probe+0x281/0x6d0 drivers/base/dd.c:520 driver_probe_device+0x104/0x210 drivers/base/dd.c:697 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:804 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:431 __device_attach+0x21a/0x360 drivers/base/dd.c:870 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0x132d/0x1c10 drivers/base/core.c:2557 usb_new_device.cold+0x753/0x103d 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+0x1eca/0x38f0 drivers/usb/core/hub.c:5576 process_one_work+0x965/0x16a0 kernel/workqueue.c:2268 worker_thread+0x96/0xe20 kernel/workqueue.c:2414 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351 The buggy address belongs to the object at ffff8880954aa980 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 0 bytes inside of 64-byte region [ffff8880954aa980, ffff8880954aa9c0) The buggy address belongs to the page: page:ffffea0002552a80 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880954aab80 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea000250c788 ffffea00029902c8 ffff8880aa000380 raw: ffff8880954aab80 ffff8880954aa000 000000010000001b 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880954aa880: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8880954aa900: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc >ffff8880954aa980: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff8880954aaa00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff8880954aaa80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================