usb 5-1: USB disconnect, device number 98
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BUG: KASAN: slab-out-of-bounds in atomic_read include/asm-generic/atomic-instrumented.h:26 [inline]
BUG: KASAN: slab-out-of-bounds in refcount_inc_not_zero_checked+0x72/0x1e0 lib/refcount.c:123
Read of size 4 at addr ffff8881af291820 by task kworker/0:5/3306

CPU: 0 PID: 3306 Comm: kworker/0:5 Not tainted 5.4.0-rc6-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+0xca/0x13e lib/dump_stack.c:113
 print_address_description.constprop.0+0x36/0x50 mm/kasan/report.c:374
 __kasan_report.cold+0x1a/0x33 mm/kasan/report.c:506
 kasan_report+0xe/0x20 mm/kasan/common.c:634
 check_memory_region_inline mm/kasan/generic.c:185 [inline]
 check_memory_region+0x128/0x190 mm/kasan/generic.c:192
 atomic_read include/asm-generic/atomic-instrumented.h:26 [inline]
 refcount_inc_not_zero_checked+0x72/0x1e0 lib/refcount.c:123
 refcount_inc_checked+0x12/0x60 lib/refcount.c:156
 get_task_struct include/linux/sched/task.h:110 [inline]
 kthread_stop+0x6c/0x610 kernel/kthread.c:554
 hwrng_unregister+0x190/0x210 drivers/char/hw_random/core.c:538
 chaoskey_disconnect+0x1b2/0x200 drivers/usb/misc/chaoskey.c:232
 usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423
 __device_release_driver drivers/base/dd.c:1134 [inline]
 device_release_driver_internal+0x42f/0x500 drivers/base/dd.c:1165
 bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:532
 device_del+0x420/0xb20 drivers/base/core.c:2376
 usb_disable_device+0x211/0x690 drivers/usb/core/message.c:1237
 usb_disconnect+0x284/0x8d0 drivers/usb/core/hub.c:2200
 hub_port_connect drivers/usb/core/hub.c:5035 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5324 [inline]
 port_event drivers/usb/core/hub.c:5470 [inline]
 hub_event+0x16f2/0x3800 drivers/usb/core/hub.c:5552
 process_one_work+0x92b/0x1530 kernel/workqueue.c:2269
 worker_thread+0x96/0xe20 kernel/workqueue.c:2415
 kthread+0x318/0x420 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

Allocated by task 14500:
 save_stack+0x1b/0x80 mm/kasan/common.c:69
 set_track mm/kasan/common.c:77 [inline]
 __kasan_kmalloc mm/kasan/common.c:510 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:483
 kmalloc include/linux/slab.h:556 [inline]
 kzalloc include/linux/slab.h:690 [inline]
 dev_new drivers/usb/gadget/legacy/raw.c:167 [inline]
 raw_open+0x43/0x3d0 drivers/usb/gadget/legacy/raw.c:333
 misc_open+0x372/0x4a0 drivers/char/misc.c:141
 chrdev_open+0x219/0x5c0 fs/char_dev.c:414
 do_dentry_open+0x494/0x1120 fs/open.c:797
 do_last fs/namei.c:3408 [inline]
 path_openat+0x1430/0x3ff0 fs/namei.c:3525
 do_filp_open+0x1a1/0x280 fs/namei.c:3555
 do_sys_open+0x3c0/0x580 fs/open.c:1097
 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 14499:
 save_stack+0x1b/0x80 mm/kasan/common.c:69
 set_track mm/kasan/common.c:77 [inline]
 kasan_set_free_info mm/kasan/common.c:332 [inline]
 __kasan_slab_free+0x130/0x180 mm/kasan/common.c:471
 slab_free_hook mm/slub.c:1424 [inline]
 slab_free_freelist_hook mm/slub.c:1475 [inline]
 slab_free mm/slub.c:3025 [inline]
 kfree+0xe4/0x320 mm/slub.c:3977
 kref_put include/linux/kref.h:65 [inline]
 raw_release+0x127/0x1d0 drivers/usb/gadget/legacy/raw.c:370
 __fput+0x2d7/0x840 fs/file_table.c:280
 task_work_run+0x13f/0x1c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x1d2/0x200 arch/x86/entry/common.c:163
 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
 do_syscall_64+0x45f/0x580 arch/x86/entry/common.c:300
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8881af290000
 which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 2080 bytes to the right of
 4096-byte region [ffff8881af290000, ffff8881af291000)
The buggy address belongs to the page:
page:ffffea0006bca400 refcount:1 mapcount:0 mapping:ffff8881da00c280 index:0x0 compound_mapcount: 0
flags: 0x200000000010200(slab|head)
raw: 0200000000010200 0000000000000000 0000000300000001 ffff8881da00c280
raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881af291700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8881af291780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8881af291800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                               ^
 ffff8881af291880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8881af291900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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