KASAN: use-after-free Read in device_del
4 messages,
3 authors,
2019-08-19 · open the first message on its own page
Hello,
syzbot found the following crash on:
HEAD commit: 69bbe8c7 usb-fuzzer: main usb gadget fuzzer driver
git tree: https://github.com/google/kasan.git usb-fuzzer
console output: https://syzkaller.appspot.com/x/log.txt?x=1684d87ca00000
kernel config: https://syzkaller.appspot.com/x/.config?x=193d8457178b3229
dashboard link: https://syzkaller.appspot.com/bug?extid=93f2f45b19519b289613
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+93f2f45b19519b289613@syzkaller.appspotmail.com
worker_thread+0x96/0xe20 kernel/workqueue.c:2414
kthread+0x30b/0x410 kernel/kthread.c:254
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
hso 3-1:0.2: Failed to find BULK IN ep
==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x3a5d/0x5340 kernel/locking/lockdep.c:3664
Read of size 8 at addr ffff8881d98a4d60 by task kworker/0:0/5
CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.2.0-rc1+ #10
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:188
__kasan_report.cold+0x1a/0x32 mm/kasan/report.c:317
kasan_report+0xe/0x20 mm/kasan/common.c:614
__lock_acquire+0x3a5d/0x5340 kernel/locking/lockdep.c:3664
lock_acquire+0x100/0x2b0 kernel/locking/lockdep.c:4302
__mutex_lock_common kernel/locking/mutex.c:925 [inline]
__mutex_lock+0xf9/0x12b0 kernel/locking/mutex.c:1072
device_lock include/linux/device.h:1207 [inline]
device_del+0xa2/0xb80 drivers/base/core.c:2240
device_unregister drivers/base/core.c:2306 [inline]
device_destroy+0x90/0xd0 drivers/base/core.c:2864
tty_unregister_device+0x7e/0x1a0 drivers/tty/tty_io.c:3189
hso_serial_tty_unregister drivers/net/usb/hso.c:2245 [inline]
hso_create_bulk_serial_device drivers/net/usb/hso.c:2682 [inline]
hso_probe.cold+0xc8/0x120 drivers/net/usb/hso.c:2948
usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
really_probe+0x281/0x660 drivers/base/dd.c:509
driver_probe_device+0x104/0x210 drivers/base/dd.c:670
__device_attach_driver+0x1c2/0x220 drivers/base/dd.c:777
bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
__device_attach+0x217/0x360 drivers/base/dd.c:843
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
device_add+0xae6/0x16f0 drivers/base/core.c:2111
usb_set_configuration+0xdf6/0x1670 drivers/usb/core/message.c:2023
generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266
really_probe+0x281/0x660 drivers/base/dd.c:509
driver_probe_device+0x104/0x210 drivers/base/dd.c:670
__device_attach_driver+0x1c2/0x220 drivers/base/dd.c:777
bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
__device_attach+0x217/0x360 drivers/base/dd.c:843
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
device_add+0xae6/0x16f0 drivers/base/core.c:2111
usb_new_device.cold+0x8c1/0x1016 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+0x1ada/0x3590 drivers/usb/core/hub.c:5432
process_one_work+0x905/0x1570 kernel/workqueue.c:2268
worker_thread+0x96/0xe20 kernel/workqueue.c:2414
kthread+0x30b/0x410 kernel/kthread.c:254
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Allocated by task 3910:
save_stack+0x1b/0x80 mm/kasan/common.c:71
set_track mm/kasan/common.c:79 [inline]
__kasan_kmalloc mm/kasan/common.c:489 [inline]
__kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:462
kmalloc include/linux/slab.h:547 [inline]
kzalloc include/linux/slab.h:742 [inline]
tty_register_device_attr+0x1b6/0x6f0 drivers/tty/tty_io.c:3128
hso_serial_common_create+0x113/0x710 drivers/net/usb/hso.c:2279
hso_create_bulk_serial_device drivers/net/usb/hso.c:2652 [inline]
hso_probe+0xc93/0x1a46 drivers/net/usb/hso.c:2948
usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
really_probe+0x281/0x660 drivers/base/dd.c:509
driver_probe_device+0x104/0x210 drivers/base/dd.c:670
__device_attach_driver+0x1c2/0x220 drivers/base/dd.c:777
bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
__device_attach+0x217/0x360 drivers/base/dd.c:843
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
device_add+0xae6/0x16f0 drivers/base/core.c:2111
usb_set_configuration+0xdf6/0x1670 drivers/usb/core/message.c:2023
generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266
really_probe+0x281/0x660 drivers/base/dd.c:509
driver_probe_device+0x104/0x210 drivers/base/dd.c:670
__device_attach_driver+0x1c2/0x220 drivers/base/dd.c:777
bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
__device_attach+0x217/0x360 drivers/base/dd.c:843
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
device_add+0xae6/0x16f0 drivers/base/core.c:2111
usb_new_device.cold+0x8c1/0x1016 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+0x1ada/0x3590 drivers/usb/core/hub.c:5432
process_one_work+0x905/0x1570 kernel/workqueue.c:2268
process_scheduled_works kernel/workqueue.c:2330 [inline]
worker_thread+0x7ab/0xe20 kernel/workqueue.c:2416
kthread+0x30b/0x410 kernel/kthread.c:254
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Freed by task 3910:
save_stack+0x1b/0x80 mm/kasan/common.c:71
set_track mm/kasan/common.c:79 [inline]
__kasan_slab_free+0x130/0x180 mm/kasan/common.c:451
slab_free_hook mm/slub.c:1421 [inline]
slab_free_freelist_hook mm/slub.c:1448 [inline]
slab_free mm/slub.c:2994 [inline]
kfree+0xd7/0x280 mm/slub.c:3949
device_release+0x71/0x200 drivers/base/core.c:1064
kobject_cleanup lib/kobject.c:691 [inline]
kobject_release lib/kobject.c:720 [inline]
kref_put include/linux/kref.h:67 [inline]
kobject_put+0x171/0x280 lib/kobject.c:737
put_device drivers/base/core.c:2210 [inline]
device_unregister drivers/base/core.c:2307 [inline]
device_destroy+0x98/0xd0 drivers/base/core.c:2864
tty_unregister_device+0x7e/0x1a0 drivers/tty/tty_io.c:3189
hso_serial_tty_unregister drivers/net/usb/hso.c:2245 [inline]
hso_create_bulk_serial_device drivers/net/usb/hso.c:2682 [inline]
hso_probe.cold+0xc8/0x120 drivers/net/usb/hso.c:2948
usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
really_probe+0x281/0x660 drivers/base/dd.c:509
driver_probe_device+0x104/0x210 drivers/base/dd.c:670
__device_attach_driver+0x1c2/0x220 drivers/base/dd.c:777
bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
__device_attach+0x217/0x360 drivers/base/dd.c:843
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
device_add+0xae6/0x16f0 drivers/base/core.c:2111
usb_set_configuration+0xdf6/0x1670 drivers/usb/core/message.c:2023
generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266
really_probe+0x281/0x660 drivers/base/dd.c:509
driver_probe_device+0x104/0x210 drivers/base/dd.c:670
__device_attach_driver+0x1c2/0x220 drivers/base/dd.c:777
bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
__device_attach+0x217/0x360 drivers/base/dd.c:843
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
device_add+0xae6/0x16f0 drivers/base/core.c:2111
usb_new_device.cold+0x8c1/0x1016 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+0x1ada/0x3590 drivers/usb/core/hub.c:5432
process_one_work+0x905/0x1570 kernel/workqueue.c:2268
process_scheduled_works kernel/workqueue.c:2330 [inline]
worker_thread+0x7ab/0xe20 kernel/workqueue.c:2416
kthread+0x30b/0x410 kernel/kthread.c:254
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
The buggy address belongs to the object at ffff8881d98a4c80
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 224 bytes inside of
2048-byte region [ffff8881d98a4c80, ffff8881d98a5480)
The buggy address belongs to the page:
page:ffffea0007662800 refcount:1 mapcount:0 mapping:ffff8881dac02800 index:0x0 compound_mapcount: 0
flags: 0x200000000010200(slab|head)
raw: 0200000000010200 dead000000000100 dead000000000200 ffff8881dac02800
raw: 0000000000000000 00000000800f000f 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8881d98a4c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8881d98a4c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881d98a4d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^
ffff8881d98a4d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8881d98a4e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.
syzbot will keep track of this bug report. See:
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Am Montag, den 03.06.2019, 04:41 -0700 schrieb syzbot: Hello,
syzbot found the following crash on:
HEAD commit: 69bbe8c7 usb-fuzzer: main usb gadget fuzzer driver
git tree: https://github.com/google/kasan.git usb-fuzzer
console output: https://syzkaller.appspot.com/x/log.txt?x=1684d87ca00000
kernel config: https://syzkaller.appspot.com/x/.config?x=193d8457178b3229
dashboard link: https://syzkaller.appspot.com/bug?extid=93f2f45b19519b289613
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
Will this do?
Regards
Oliver
On Thu, Jun 6, 2019 at 10:54 AM Oliver Neukum [off-list ref] wrote:
Am Montag, den 03.06.2019, 04:41 -0700 schrieb syzbot: quoted Hello,
syzbot found the following crash on:
HEAD commit: 69bbe8c7 usb-fuzzer: main usb gadget fuzzer driver
git tree: https://github.com/google/kasan.git usb-fuzzer
console output: https://syzkaller.appspot.com/x/log.txt?x=1684d87ca00000
kernel config: https://syzkaller.appspot.com/x/.config?x=193d8457178b3229
dashboard link: https://syzkaller.appspot.com/bug?extid=93f2f45b19519b289613
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
Will this do?
Hi Oliver,
Unfortunately there's no reproducer for this bug. I've looked at the
fix, but I'm not sure I understand what it does. Perhaps expanding the
patch description would help, as it doesn't make the patch any more
clear for me. But I'm not familiar with this code, so if you think
this change makes sense and supposedly fixes this bug, then please
post it.
Thanks!
Regards
Oliver
On Mon, Jun 3, 2019 at 1:41 PM syzbot
[off-list ref] wrote:
Hello,
syzbot found the following crash on:
HEAD commit: 69bbe8c7 usb-fuzzer: main usb gadget fuzzer driver
git tree: https://github.com/google/kasan.git usb-fuzzer
console output: https://syzkaller.appspot.com/x/log.txt?x=1684d87ca00000
kernel config: https://syzkaller.appspot.com/x/.config?x=193d8457178b3229
dashboard link: https://syzkaller.appspot.com/bug?extid=93f2f45b19519b289613
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+93f2f45b19519b289613@syzkaller.appspotmail.com
worker_thread+0x96/0xe20 kernel/workqueue.c:2414
kthread+0x30b/0x410 kernel/kthread.c:254
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
hso 3-1:0.2: Failed to find BULK IN ep
==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x3a5d/0x5340
kernel/locking/lockdep.c:3664
Read of size 8 at addr ffff8881d98a4d60 by task kworker/0:0/5
CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.2.0-rc1+ #10
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:188
__kasan_report.cold+0x1a/0x32 mm/kasan/report.c:317
kasan_report+0xe/0x20 mm/kasan/common.c:614
__lock_acquire+0x3a5d/0x5340 kernel/locking/lockdep.c:3664
lock_acquire+0x100/0x2b0 kernel/locking/lockdep.c:4302
__mutex_lock_common kernel/locking/mutex.c:925 [inline]
__mutex_lock+0xf9/0x12b0 kernel/locking/mutex.c:1072
device_lock include/linux/device.h:1207 [inline]
device_del+0xa2/0xb80 drivers/base/core.c:2240
device_unregister drivers/base/core.c:2306 [inline]
device_destroy+0x90/0xd0 drivers/base/core.c:2864
tty_unregister_device+0x7e/0x1a0 drivers/tty/tty_io.c:3189
hso_serial_tty_unregister drivers/net/usb/hso.c:2245 [inline]
hso_create_bulk_serial_device drivers/net/usb/hso.c:2682 [inline]
hso_probe.cold+0xc8/0x120 drivers/net/usb/hso.c:2948
usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
really_probe+0x281/0x660 drivers/base/dd.c:509
driver_probe_device+0x104/0x210 drivers/base/dd.c:670
__device_attach_driver+0x1c2/0x220 drivers/base/dd.c:777
bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
__device_attach+0x217/0x360 drivers/base/dd.c:843
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
device_add+0xae6/0x16f0 drivers/base/core.c:2111
usb_set_configuration+0xdf6/0x1670 drivers/usb/core/message.c:2023
generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266
really_probe+0x281/0x660 drivers/base/dd.c:509
driver_probe_device+0x104/0x210 drivers/base/dd.c:670
__device_attach_driver+0x1c2/0x220 drivers/base/dd.c:777
bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
__device_attach+0x217/0x360 drivers/base/dd.c:843
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
device_add+0xae6/0x16f0 drivers/base/core.c:2111
usb_new_device.cold+0x8c1/0x1016 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+0x1ada/0x3590 drivers/usb/core/hub.c:5432
process_one_work+0x905/0x1570 kernel/workqueue.c:2268
worker_thread+0x96/0xe20 kernel/workqueue.c:2414
kthread+0x30b/0x410 kernel/kthread.c:254
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Allocated by task 3910:
save_stack+0x1b/0x80 mm/kasan/common.c:71
set_track mm/kasan/common.c:79 [inline]
__kasan_kmalloc mm/kasan/common.c:489 [inline]
__kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:462
kmalloc include/linux/slab.h:547 [inline]
kzalloc include/linux/slab.h:742 [inline]
tty_register_device_attr+0x1b6/0x6f0 drivers/tty/tty_io.c:3128
hso_serial_common_create+0x113/0x710 drivers/net/usb/hso.c:2279
hso_create_bulk_serial_device drivers/net/usb/hso.c:2652 [inline]
hso_probe+0xc93/0x1a46 drivers/net/usb/hso.c:2948
usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
really_probe+0x281/0x660 drivers/base/dd.c:509
driver_probe_device+0x104/0x210 drivers/base/dd.c:670
__device_attach_driver+0x1c2/0x220 drivers/base/dd.c:777
bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
__device_attach+0x217/0x360 drivers/base/dd.c:843
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
device_add+0xae6/0x16f0 drivers/base/core.c:2111
usb_set_configuration+0xdf6/0x1670 drivers/usb/core/message.c:2023
generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266
really_probe+0x281/0x660 drivers/base/dd.c:509
driver_probe_device+0x104/0x210 drivers/base/dd.c:670
__device_attach_driver+0x1c2/0x220 drivers/base/dd.c:777
bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
__device_attach+0x217/0x360 drivers/base/dd.c:843
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
device_add+0xae6/0x16f0 drivers/base/core.c:2111
usb_new_device.cold+0x8c1/0x1016 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+0x1ada/0x3590 drivers/usb/core/hub.c:5432
process_one_work+0x905/0x1570 kernel/workqueue.c:2268
process_scheduled_works kernel/workqueue.c:2330 [inline]
worker_thread+0x7ab/0xe20 kernel/workqueue.c:2416
kthread+0x30b/0x410 kernel/kthread.c:254
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Freed by task 3910:
save_stack+0x1b/0x80 mm/kasan/common.c:71
set_track mm/kasan/common.c:79 [inline]
__kasan_slab_free+0x130/0x180 mm/kasan/common.c:451
slab_free_hook mm/slub.c:1421 [inline]
slab_free_freelist_hook mm/slub.c:1448 [inline]
slab_free mm/slub.c:2994 [inline]
kfree+0xd7/0x280 mm/slub.c:3949
device_release+0x71/0x200 drivers/base/core.c:1064
kobject_cleanup lib/kobject.c:691 [inline]
kobject_release lib/kobject.c:720 [inline]
kref_put include/linux/kref.h:67 [inline]
kobject_put+0x171/0x280 lib/kobject.c:737
put_device drivers/base/core.c:2210 [inline]
device_unregister drivers/base/core.c:2307 [inline]
device_destroy+0x98/0xd0 drivers/base/core.c:2864
tty_unregister_device+0x7e/0x1a0 drivers/tty/tty_io.c:3189
hso_serial_tty_unregister drivers/net/usb/hso.c:2245 [inline]
hso_create_bulk_serial_device drivers/net/usb/hso.c:2682 [inline]
hso_probe.cold+0xc8/0x120 drivers/net/usb/hso.c:2948
usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
really_probe+0x281/0x660 drivers/base/dd.c:509
driver_probe_device+0x104/0x210 drivers/base/dd.c:670
__device_attach_driver+0x1c2/0x220 drivers/base/dd.c:777
bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
__device_attach+0x217/0x360 drivers/base/dd.c:843
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
device_add+0xae6/0x16f0 drivers/base/core.c:2111
usb_set_configuration+0xdf6/0x1670 drivers/usb/core/message.c:2023
generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266
really_probe+0x281/0x660 drivers/base/dd.c:509
driver_probe_device+0x104/0x210 drivers/base/dd.c:670
__device_attach_driver+0x1c2/0x220 drivers/base/dd.c:777
bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
__device_attach+0x217/0x360 drivers/base/dd.c:843
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
device_add+0xae6/0x16f0 drivers/base/core.c:2111
usb_new_device.cold+0x8c1/0x1016 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+0x1ada/0x3590 drivers/usb/core/hub.c:5432
process_one_work+0x905/0x1570 kernel/workqueue.c:2268
process_scheduled_works kernel/workqueue.c:2330 [inline]
worker_thread+0x7ab/0xe20 kernel/workqueue.c:2416
kthread+0x30b/0x410 kernel/kthread.c:254
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
The buggy address belongs to the object at ffff8881d98a4c80
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 224 bytes inside of
2048-byte region [ffff8881d98a4c80, ffff8881d98a5480)
The buggy address belongs to the page:
page:ffffea0007662800 refcount:1 mapcount:0 mapping:ffff8881dac02800
index:0x0 compound_mapcount: 0
flags: 0x200000000010200(slab|head)
raw: 0200000000010200 dead000000000100 dead000000000200 ffff8881dac02800
raw: 0000000000000000 00000000800f000f 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8881d98a4c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8881d98a4c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb quoted ffff8881d98a4d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^
ffff8881d98a4d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8881d98a4e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.
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#syz dup: general protection fault in cdev_del