syzbot


KASAN: use-after-free Read in usb_kill_anchored_urbs

Status: closed as dup on 2020/06/18 12:01
Reported-by: syzbot+eb6ab607626fd1dac0f1@syzkaller.appspotmail.com
First crash: 1334d, last: 1231d
Duplicate of (1):
Title Repro Cause bisect Fix bisect Count Last Reported
KASAN: use-after-free Read in mcba_usb_disconnect C 2 1190d 1222d
Last patch testing requests:
Created Duration User Patch Repo Result
2019/07/04 14:29 19m tranmanphong@gmail.com patch https://github.com/google/kasan.git usb-fuzzer OK

Sample crash report:
usb 1-1: USB disconnect, device number 2
mcba_usb 1-1:0.117 can0: device disconnected
==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x3377/0x3eb0 kernel/locking/lockdep.c:3828
Read of size 8 at addr ffff8881d2d98f48 by task kworker/0:1/12

CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.3.0+ #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+0x6a/0x32c mm/kasan/report.c:351
 __kasan_report.cold+0x1a/0x33 mm/kasan/report.c:482
 kasan_report+0xe/0x12 mm/kasan/common.c:618
 __lock_acquire+0x3377/0x3eb0 kernel/locking/lockdep.c:3828
 lock_acquire+0x127/0x320 kernel/locking/lockdep.c:4487
 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline]
 _raw_spin_lock_irq+0x2d/0x40 kernel/locking/spinlock.c:167
 spin_lock_irq include/linux/spinlock.h:363 [inline]
 usb_kill_anchored_urbs+0x1e/0x110 drivers/usb/core/urb.c:787
 mcba_urb_unlink drivers/net/can/usb/mcba_usb.c:711 [inline]
 mcba_usb_disconnect+0xd6/0xe4 drivers/net/can/usb/mcba_usb.c:881
 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+0x420/0xb10 drivers/base/core.c:2375
 usb_disable_device+0x211/0x690 drivers/usb/core/message.c:1237
 usb_disconnect+0x284/0x8d0 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+0x1454/0x3640 drivers/usb/core/hub.c:5441
 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

The buggy address belongs to the page:
page:ffffea00074b6600 refcount:1 mapcount:0 mapping:ffff8881da114000 index:0x0 compound_mapcount: 0
flags: 0x200000000010200(slab|head)
raw: 0200000000010200 dead000000000100 dead000000000122 ffff8881da114000
raw: 0000000000000000 0000000000070007 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881d2d98e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881d2d98e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881d2d98f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                              ^
 ffff8881d2d98f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881d2d99000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================

Crashes (6):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Title
ci2-upstream-usb 2019/09/22 02:29 https://github.com/google/kasan.git usb-fuzzer e0bd8d794fc9 d96e88f3 .config console log report syz C
ci2-upstream-usb 2019/09/16 03:13 https://github.com/google/kasan.git usb-fuzzer f0df5c1be1e9 32d59357 .config console log report syz C
ci2-upstream-usb 2019/07/06 16:30 https://github.com/google/kasan.git usb-fuzzer 7829a896a587 f62e1e85 .config console log report syz C
ci2-upstream-usb 2019/07/01 09:38 https://github.com/google/kasan.git usb-fuzzer 7829a896a587 699d6448 .config console log report syz C
ci2-upstream-usb 2019/06/11 15:21 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f 5b5826d0 .config console log report syz C
ci2-upstream-usb 2019/09/10 03:16 https://github.com/google/kasan.git usb-fuzzer f0df5c1be1e9 a60cb4cd .config console log report
* Struck through repros no longer work on HEAD.