syzbot

usb 1-1: USB disconnect, device number 72
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BUG: KASAN: slab-out-of-bounds in usb_destroy_configuration+0x636/0x6d0 drivers/usb/core/config.c:834
Read of size 8 at addr ffff8881c7e3c758 by task kworker/1:7/3434

CPU: 1 PID: 3434 Comm: kworker/1:7 Not tainted 5.8.0-rc7-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+0x1a/0x210 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report.cold+0x37/0x7c mm/kasan/report.c:530
 usb_destroy_configuration+0x636/0x6d0 drivers/usb/core/config.c:834
 usb_release_dev+0x3e/0x100 drivers/usb/core/usb.c:417
 device_release+0x71/0x200 drivers/base/core.c:1579
 kobject_cleanup lib/kobject.c:693 [inline]
 kobject_release lib/kobject.c:722 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x245/0x540 lib/kobject.c:739
 put_device+0x1b/0x30 drivers/base/core.c:2799
 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+0x1c93/0x4390 drivers/usb/core/hub.c:5576
 process_one_work+0x94c/0x15f0 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x392/0x470 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293

Allocated by task 13775:
 save_stack+0x1b/0x40 mm/kasan/common.c:48
 set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:494
 kmalloc include/linux/slab.h:560 [inline]
 kzalloc include/linux/slab.h:669 [inline]
 usb_get_configuration+0x186/0x3a50 drivers/usb/core/config.c:887
 usb_enumerate_device drivers/usb/core/hub.c:2387 [inline]
 usb_new_device+0x42c/0x7a0 drivers/usb/core/hub.c:2523
 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+0x2361/0x4390 drivers/usb/core/hub.c:5576
 process_one_work+0x94c/0x15f0 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x392/0x470 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293

Freed by task 3070:
 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+0x116/0x160 mm/kasan/common.c:455
 slab_free_hook mm/slub.c:1474 [inline]
 slab_free_freelist_hook+0x53/0x140 mm/slub.c:1507
 slab_free mm/slub.c:3072 [inline]
 kfree+0xbc/0x2c0 mm/slub.c:4052
 kfree_const+0x51/0x60 mm/util.c:40
 kobject_cleanup lib/kobject.c:699 [inline]
 kobject_release lib/kobject.c:722 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x26f/0x540 lib/kobject.c:739
 put_device drivers/base/core.c:2799 [inline]
 device_unregister+0x34/0xc0 drivers/base/core.c:2910
 usb_remove_ep_devs+0x3e/0x80 drivers/usb/core/endpoint.c:215
 remove_intf_ep_devs drivers/usb/core/message.c:1120 [inline]
 usb_disable_device+0x335/0x930 drivers/usb/core/message.c:1244
 usb_disconnect.cold+0x27d/0x780 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+0x1c93/0x4390 drivers/usb/core/hub.c:5576
 process_one_work+0x94c/0x15f0 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x392/0x470 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293

The buggy address belongs to the object at ffff8881c7e3c750
 which belongs to the cache kmalloc-8 of size 8
The buggy address is located 0 bytes to the right of
 8-byte region [ffff8881c7e3c750, ffff8881c7e3c758)
The buggy address belongs to the page:
page:ffffea00071f8f00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8881c7e3c7b0
flags: 0x200000000000200(slab)
raw: 0200000000000200 ffffea00071ffac0 0000000b0000000b ffff8881da003900
raw: ffff8881c7e3c7b0 0000000080aa00a8 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881c7e3c600: 00 fc fc 00 fc fc fb fc fc fb fc fc 00 fc fc fb
 ffff8881c7e3c680: fc fc fb fc fc fb fc fc fb fc fc fb fc fc fb fc
>ffff8881c7e3c700: fc fb fc fc 00 fc fc fb fc fc 00 fc fc fb fc fc
                                                    ^
 ffff8881c7e3c780: 00 fc fc fb fc fc fb fc fc 00 fc fc fb fc fc 00
 ffff8881c7e3c800: fc fc 00 fc fc fb fc fc fb fc fc 00 fc fc 00 fc
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