usb 2-1: USB disconnect, device number 2 ================================================================== BUG: KASAN: use-after-free in kobject_put+0x296/0x2f0 lib/kobject.c:745 Read of size 1 at addr ffff888091d561c4 by task kworker/0:2/2507 CPU: 0 PID: 2507 Comm: kworker/0:2 Not tainted 5.7.0-rc6-next-20200522-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+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 kobject_put+0x296/0x2f0 lib/kobject.c:745 put_device+0x1b/0x30 drivers/base/core.c:2761 __input_unregister_device+0x1b0/0x430 drivers/input/input.c:2091 input_unregister_device+0xb4/0xf0 drivers/input/input.c:2273 hidinput_disconnect+0x15e/0x3d0 drivers/hid/hid-input.c:1968 hid_disconnect+0x13f/0x1a0 drivers/hid/hid-core.c:2008 hid_hw_stop+0x12/0x70 drivers/hid/hid-core.c:2055 ms_remove+0x12/0x90 drivers/hid/hid-microsoft.c:412 hid_device_remove+0xed/0x240 drivers/hid/hid-core.c:2296 __device_release_driver drivers/base/dd.c:1111 [inline] device_release_driver_internal+0x231/0x500 drivers/base/dd.c:1144 bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:533 device_del+0x481/0xd30 drivers/base/core.c:2839 hid_remove_device drivers/hid/hid-core.c:2467 [inline] hid_destroy_device+0xe1/0x150 drivers/hid/hid-core.c:2486 usbhid_disconnect+0x9f/0xe0 drivers/hid/usbhid/hid-core.c:1434 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+0x2dc/0x4a0 drivers/base/bus.c:533 device_del+0x481/0xd30 drivers/base/core.c:2839 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+0x3b5/0x4a0 kernel/kthread.c:291 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351 Allocated by task 2647: 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] evdev_connect+0x80/0x4d0 drivers/input/evdev.c:1352 input_attach_handler+0x194/0x200 drivers/input/input.c:1031 input_register_device.cold+0xf5/0x246 drivers/input/input.c:2229 hidinput_connect+0x4f8f/0xdb30 drivers/hid/hid-input.c:1935 hid_connect+0x96b/0xbc0 drivers/hid/hid-core.c:1931 hid_hw_start drivers/hid/hid-core.c:2035 [inline] hid_hw_start+0xa2/0x130 drivers/hid/hid-core.c:2026 ms_probe+0x159/0x4e0 drivers/hid/hid-microsoft.c:394 hid_device_probe+0x2be/0x3f0 drivers/hid/hid-core.c:2263 really_probe+0x281/0x6d0 drivers/base/dd.c:525 driver_probe_device+0xfe/0x1d0 drivers/base/dd.c:701 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:807 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:431 __device_attach+0x21a/0x360 drivers/base/dd.c:873 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xaf1/0x1900 drivers/base/core.c:2662 hid_add_device drivers/hid/hid-core.c:2419 [inline] hid_add_device+0x33c/0x9a0 drivers/hid/hid-core.c:2368 usbhid_probe+0xac8/0xff0 drivers/hid/usbhid/hid-core.c:1407 usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:374 really_probe+0x281/0x6d0 drivers/base/dd.c:525 driver_probe_device+0xfe/0x1d0 drivers/base/dd.c:701 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:807 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:431 __device_attach+0x21a/0x360 drivers/base/dd.c:873 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xaf1/0x1900 drivers/base/core.c:2662 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:525 driver_probe_device+0xfe/0x1d0 drivers/base/dd.c:701 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:807 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:431 __device_attach+0x21a/0x360 drivers/base/dd.c:873 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xaf1/0x1900 drivers/base/core.c:2662 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+0x3b5/0x4a0 kernel/kthread.c:291 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351 Freed by task 15180: 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 device_release+0x71/0x200 drivers/base/core.c:1541 kobject_cleanup lib/kobject.c:701 [inline] kobject_release lib/kobject.c:732 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1c8/0x2f0 lib/kobject.c:749 cdev_put.part.0+0x32/0x50 fs/char_dev.c:365 cdev_put+0x1b/0x30 fs/char_dev.c:363 __fput+0x69b/0x880 fs/file_table.c:284 task_work_run+0xf4/0x1b0 kernel/task_work.c:123 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x2fa/0x360 arch/x86/entry/common.c:165 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline] syscall_return_slowpath arch/x86/entry/common.c:279 [inline] do_syscall_64+0x6b1/0x7d0 arch/x86/entry/common.c:305 entry_SYSCALL_64_after_hwframe+0x49/0xb3 The buggy address belongs to the object at ffff888091d56000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 452 bytes inside of 2048-byte region [ffff888091d56000, ffff888091d56800) The buggy address belongs to the page: page:ffffea0002475580 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea000221a448 ffffea0002262048 ffff8880aa000e00 raw: 0000000000000000 ffff888091d56000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888091d56080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888091d56100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888091d56180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888091d56200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888091d56280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================