usb 6-1: new low-speed USB device number 101 using dummy_hcd
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BUG: KASAN: slab-out-of-bounds in usb_get_bos_descriptor+0x8b9/0x8f6 drivers/usb/core/config.c:976
Write of size 1 at addr ffff8881d2cff01c by task kworker/1:1/23

CPU: 1 PID: 23 Comm: kworker/1:1 Not tainted 5.1.0-rc3+ #8
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+0xca/0x13e lib/dump_stack.c:113
 print_address_description+0x67/0x231 mm/kasan/report.c:187
 kasan_report.cold+0x1a/0x35 mm/kasan/report.c:317
 usb_get_bos_descriptor+0x8b9/0x8f6 drivers/usb/core/config.c:976
 hub_port_init+0x15f4/0x2c20 drivers/usb/core/hub.c:4828
 hub_port_connect drivers/usb/core/hub.c:5021 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5204 [inline]
 port_event drivers/usb/core/hub.c:5350 [inline]
 hub_event+0x18ec/0x35a0 drivers/usb/core/hub.c:5432
 process_one_work+0x90a/0x1580 kernel/workqueue.c:2269
 worker_thread+0x96/0xe20 kernel/workqueue.c:2415
 kthread+0x30e/0x420 kernel/kthread.c:253
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352

Allocated by task 23:
 set_track mm/kasan/common.c:87 [inline]
 __kasan_kmalloc mm/kasan/common.c:497 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:470
 kmalloc include/linux/slab.h:552 [inline]
 kzalloc include/linux/slab.h:742 [inline]
 usb_get_bos_descriptor+0x1dd/0x8f6 drivers/usb/core/config.c:955
 hub_port_init+0x15f4/0x2c20 drivers/usb/core/hub.c:4828
 hub_port_connect drivers/usb/core/hub.c:5021 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5204 [inline]
 port_event drivers/usb/core/hub.c:5350 [inline]
 hub_event+0x18ec/0x35a0 drivers/usb/core/hub.c:5432
 process_one_work+0x90a/0x1580 kernel/workqueue.c:2269
 worker_thread+0x96/0xe20 kernel/workqueue.c:2415
 kthread+0x30e/0x420 kernel/kthread.c:253
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352

Freed by task 6817:
 set_track mm/kasan/common.c:87 [inline]
 __kasan_slab_free+0x130/0x180 mm/kasan/common.c:459
 slab_free_hook mm/slub.c:1429 [inline]
 slab_free_freelist_hook mm/slub.c:1456 [inline]
 slab_free mm/slub.c:3003 [inline]
 kfree+0xd7/0x290 mm/slub.c:3958
 ufx_reg_write+0x10a/0x190 drivers/video/fbdev/smscufx.c:188
 ufx_config_sys_clk drivers/video/fbdev/smscufx.c:392 [inline]
 ufx_usb_probe+0xdc2/0x2897 drivers/video/fbdev/smscufx.c:1690
 usb_probe_interface+0x30d/0x7b0 drivers/usb/core/driver.c:361
 really_probe+0x296/0x680 drivers/base/dd.c:509
 driver_probe_device+0xf9/0x200 drivers/base/dd.c:671
 __device_attach_driver+0x1c4/0x230 drivers/base/dd.c:778
 bus_for_each_drv+0x15e/0x1e0 drivers/base/bus.c:454
 __device_attach+0x21e/0x360 drivers/base/dd.c:844
 bus_probe_device+0x1ec/0x2a0 drivers/base/bus.c:514
 device_add+0xaf4/0x1700 drivers/base/core.c:2106
 usb_set_configuration+0xdf2/0x1670 drivers/usb/core/message.c:2023
 generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
 usb_probe_device+0xa8/0x110 drivers/usb/core/driver.c:266
 really_probe+0x296/0x680 drivers/base/dd.c:509
 driver_probe_device+0xf9/0x200 drivers/base/dd.c:671
 __device_attach_driver+0x1c4/0x230 drivers/base/dd.c:778
 bus_for_each_drv+0x15e/0x1e0 drivers/base/bus.c:454
 __device_attach+0x21e/0x360 drivers/base/dd.c:844
 bus_probe_device+0x1ec/0x2a0 drivers/base/bus.c:514
 device_add+0xaf4/0x1700 drivers/base/core.c:2106
 usb_new_device.cold+0x8b8/0x1030 drivers/usb/core/hub.c:2534
 hub_port_connect drivers/usb/core/hub.c:5089 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5204 [inline]
 port_event drivers/usb/core/hub.c:5350 [inline]
 hub_event+0x1ac9/0x35a0 drivers/usb/core/hub.c:5432
 process_one_work+0x90a/0x1580 kernel/workqueue.c:2269
 worker_thread+0x96/0xe20 kernel/workqueue.c:2415
 kthread+0x30e/0x420 kernel/kthread.c:253
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352

The buggy address belongs to the object at ffff8881d2cff018
 which belongs to the cache kmalloc-8 of size 8
The buggy address is located 4 bytes inside of
 8-byte region [ffff8881d2cff018, ffff8881d2cff020)
The buggy address belongs to the page:
page:ffffea00074b3fc0 count:1 mapcount:0 mapping:ffff8881dac03c00 index:0xffff8881d2cff408
flags: 0x200000000000200(slab)
raw: 0200000000000200 ffffea00071df700 0000000800000008 ffff8881dac03c00
raw: ffff8881d2cff408 0000000080aa00a7 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881d2cfef00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881d2cfef80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8881d2cff000: fb fc fc 03 fc fc fb fc fc fb fc fc fb fc fc fb
                            ^
 ffff8881d2cff080: fc fc fb fc fc fb fc fc fb fc fc fb fc fc fb fc
 ffff8881d2cff100: fc fb fc fc fb fc fc fb fc fc fb fc fc fb fc fc
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