syzbot


KMSAN: use-after-free in mutex_spin_on_owner

Status: fixed on 2019/11/27 06:10
Subsystems: usb
[Documentation on labels]
Fix commit: edc4746f253d USB: iowarrior: fix use-after-free on disconnect
First crash: 1747d, last: 1747d

Sample crash report:
=====================================================
BUG: KMSAN: use-after-free in mutex_optimistic_spin kernel/locking/mutex.c:647 [inline]
BUG: KMSAN: use-after-free in __mutex_lock_common kernel/locking/mutex.c:933 [inline]
BUG: KMSAN: use-after-free in __mutex_lock+0x5d8/0x1980 kernel/locking/mutex.c:1077
CPU: 0 PID: 11462 Comm: kworker/0:3 Not tainted 5.3.0-rc7+ #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+0x191/0x1f0 lib/dump_stack.c:113
 kmsan_report+0x17d/0x2f0 mm/kmsan/kmsan_report.c:114
 __msan_warning+0x73/0xe0 mm/kmsan/kmsan_instr.c:250
 mutex_spin_on_owner+0x24e/0x420 kernel/locking/mutex.c:542
 mutex_optimistic_spin kernel/locking/mutex.c:647 [inline]
 __mutex_lock_common kernel/locking/mutex.c:933 [inline]
 __mutex_lock+0x5d8/0x1980 kernel/locking/mutex.c:1077
 __mutex_lock_slowpath+0x2c/0x30 kernel/locking/mutex.c:1338
 mutex_lock+0x5d/0x80 kernel/locking/mutex.c:258
 iowarrior_disconnect+0x133/0x3e0 drivers/usb/misc/iowarrior.c:878
 usb_unbind_interface+0x3a2/0xdd0 drivers/usb/core/driver.c:423
 __device_release_driver drivers/base/dd.c:1120 [inline]
 device_release_driver_internal+0x911/0xd20 drivers/base/dd.c:1151
 device_release_driver+0x4b/0x60 drivers/base/dd.c:1174
 bus_remove_device+0x4bf/0x670 drivers/base/bus.c:556
 device_del+0xcd5/0x1d10 drivers/base/core.c:2339
 usb_disable_device+0x567/0x1150 drivers/usb/core/message.c:1241
 usb_disconnect+0x51e/0xd60 drivers/usb/core/hub.c:2199
 hub_port_connect drivers/usb/core/hub.c:4949 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5213 [inline]
 port_event drivers/usb/core/hub.c:5359 [inline]
 hub_event+0x3fd0/0x72f0 drivers/usb/core/hub.c:5441
 process_one_work+0x1572/0x1ef0 kernel/workqueue.c:2269
 worker_thread+0x111b/0x2460 kernel/workqueue.c:2415
 kthread+0x4b5/0x4f0 kernel/kthread.c:256
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:154 [inline]
 kmsan_internal_poison_shadow+0x60/0x120 mm/kmsan/kmsan.c:137
 kmsan_slab_free+0x8d/0x100 mm/kmsan/kmsan_hooks.c:123
 slab_free_freelist_hook mm/slub.c:1472 [inline]
 slab_free mm/slub.c:3038 [inline]
 kfree+0x4c1/0x2db0 mm/slub.c:3980
 device_release+0xfb/0x380 drivers/base/core.c:1068
 kobject_cleanup lib/kobject.c:693 [inline]
 kobject_release lib/kobject.c:722 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x38d/0x480 lib/kobject.c:739
 put_device drivers/base/core.c:2264 [inline]
 device_unregister+0x63/0x80 drivers/base/core.c:2372
 usb_remove_ep_devs+0x7e/0xe0 drivers/usb/core/endpoint.c:215
 remove_intf_ep_devs drivers/usb/core/message.c:1116 [inline]
 usb_disable_device+0x41a/0x1150 drivers/usb/core/message.c:1240
 usb_disconnect+0x51e/0xd60 drivers/usb/core/hub.c:2199
 hub_port_connect drivers/usb/core/hub.c:4949 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5213 [inline]
 port_event drivers/usb/core/hub.c:5359 [inline]
 hub_event+0x3fd0/0x72f0 drivers/usb/core/hub.c:5441
 process_one_work+0x1572/0x1ef0 kernel/workqueue.c:2269
 worker_thread+0x111b/0x2460 kernel/workqueue.c:2415
 kthread+0x4b5/0x4f0 kernel/kthread.c:256
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355
=====================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/10/09 08:10 https://github.com/google/kmsan.git master cebb918b7474 b1ebbfef .config console log report syz C ci-upstream-kmsan-gce
* Struck through repros no longer work on HEAD.