KASAN: use-after-free Read in device

KASAN: use-after-free Read in device_del
Status: closed as dup on 2019/08/19 18:37
Reported-by: syzbot+93f2f45b19519b289613@syzkaller.appspotmail.com
First crash: 168d, last: 61d
Duplicate of (1):
Title	Repro	Bisected	Count	Last	Reported
general protection fault in cdev_del	C		62	14h41m	172d
Sample crash report:
 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
==================================================================
Crashes (2):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	Maintainers
ci2-upstream-usb	2019/06/02 09:29	https://github.com/google/kasan.git usb-fuzzer	69bbe8c7	53c81ea5	.config	log	report			gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2019/09/16 20:21	https://github.com/google/kasan.git usb-fuzzer	f0df5c1b	51ca0454	.config	log	report			gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org