syzbot


KASAN: slab-out-of-bounds Read in hdpvr_probe

Status: fixed on 2019/10/15 23:40
Subsystems: usb media
[Documentation on labels]
Reported-by: syzbot+79d18aac4bf1770dd050@syzkaller.appspotmail.com
Fix commit: 8b8900b729e4 media: hdpvr: add terminating 0 at end of string
First crash: 1823d, last: 1748d
Discussions (18)
Title Replies (including bot) Last reply
[PATCH 5.2 000/313] 5.2.19-stable review 324 (324) 2020/06/23 22:07
[PATCH 4.19 000/211] 4.19.77-stable review 227 (227) 2019/11/12 00:25
[PATCH 5.3 000/344] 5.3.4-stable review 360 (360) 2019/11/11 06:01
[PATCH 4.14 000/185] 4.14.147-stable review 191 (191) 2019/10/05 00:10
[PATCH 4.9 000/129] 4.9.195-stable review 135 (135) 2019/10/04 22:56
[PATCH 4.4 00/99] 4.4.195-stable review 105 (105) 2019/10/04 22:55
[PATCH AUTOSEL 5.2 001/185] ALSA: hda: Flush interrupts on disabling 191 (191) 2019/10/02 19:16
[PATCH AUTOSEL 5.3 001/203] ALSA: hda: Flush interrupts on disabling 217 (217) 2019/10/02 14:35
[PATCH AUTOSEL 4.4 01/44] ALSA: hda: Flush interrupts on disabling 44 (44) 2019/09/22 19:01
[PATCH AUTOSEL 4.9 01/60] ALSA: hda: Flush interrupts on disabling 60 (60) 2019/09/22 18:59
[PATCH AUTOSEL 4.14 01/89] ALSA: hda: Flush interrupts on disabling 89 (89) 2019/09/22 18:57
[PATCH AUTOSEL 4.19 001/128] ALSA: hda: Flush interrupts on disabling 128 (128) 2019/09/22 18:54
[PATCH] hdpvr: add terminating 0 at end of string 1 (1) 2019/08/15 13:00
Reminder: 35 open syzbot bugs in media subsystem 1 (1) 2019/07/24 01:39
Reminder: 67 open syzbot bugs in usb subsystem 1 (1) 2019/07/24 01:35
Reminder: 47 open syzbot bugs in usb subsystem 1 (1) 2019/07/09 19:01
KASAN: slab-out-of-bounds Read in hdpvr_probe 0 (2) 2019/07/01 22:30
Reminder: 28 open syzbot bugs in media subsystem 1 (1) 2019/06/27 03:53
Last patch testing requests (2)
Created Duration User Patch Repo Result
2019/08/15 06:54 19m hverkuil@xs4all.nl patch https://github.com/google/kasan.git usb-fuzzer OK
2019/07/03 20:59 11m tranmanphong@gmail.com patch https://github.com/google/kasan.git usb-fuzzer report log

Sample crash report:
usb 1-1: config 0 interface 26 altsetting 0 bulk endpoint 0x8F has invalid maxpacket 0
usb 1-1: New USB device found, idVendor=2040, idProduct=4902, bcdDevice=ff.51
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 1-1: config 0 descriptor??
==================================================================
BUG: KASAN: slab-out-of-bounds in string_nocheck+0x1ee/0x220 lib/vsprintf.c:605
Read of size 1 at addr ffff8881d6a1c820 by task kworker/0:1/12

CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.3.0-rc4+ #26
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:612
 string_nocheck+0x1ee/0x220 lib/vsprintf.c:605
 string+0xe5/0xf0 lib/vsprintf.c:668
 vsnprintf+0x7d3/0x14f0 lib/vsprintf.c:2503
 vscnprintf+0x29/0x80 lib/vsprintf.c:2606
 vprintk_store+0x40/0x4b0 kernel/printk/printk.c:1907
 vprintk_emit+0xc8/0x3e0 kernel/printk/printk.c:1968
 vprintk_func+0x75/0x113 kernel/printk/printk_safe.c:386
 printk+0xba/0xed kernel/printk/printk.c:2046
 device_authorization drivers/media/usb/hdpvr/hdpvr-core.c:140 [inline]
 hdpvr_device_init drivers/media/usb/hdpvr/hdpvr-core.c:201 [inline]
 hdpvr_probe.cold+0x194/0x1247 drivers/media/usb/hdpvr/hdpvr-core.c:342
 usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
 really_probe+0x281/0x6d0 drivers/base/dd.c:548
 driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721
 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:454
 __device_attach+0x217/0x360 drivers/base/dd.c:894
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
 device_add+0xae6/0x16f0 drivers/base/core.c:2165
 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+0x281/0x6d0 drivers/base/dd.c:548
 driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721
 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:454
 __device_attach+0x217/0x360 drivers/base/dd.c:894
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
 device_add+0xae6/0x16f0 drivers/base/core.c:2165
 usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2536
 hub_port_connect drivers/usb/core/hub.c:5098 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5213 [inline]
 port_event drivers/usb/core/hub.c:5359 [inline]
 hub_event+0x1b5c/0x3640 drivers/usb/core/hub.c:5441
 process_one_work+0x92b/0x1530 kernel/workqueue.c:2269
 process_scheduled_works kernel/workqueue.c:2331 [inline]
 worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417
 kthread+0x318/0x420 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

Allocated by task 12:
 save_stack+0x1b/0x80 mm/kasan/common.c:69
 set_track mm/kasan/common.c:77 [inline]
 __kasan_kmalloc mm/kasan/common.c:487 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:460
 kmalloc include/linux/slab.h:552 [inline]
 hdpvr_probe+0x1ce/0xac0 drivers/media/usb/hdpvr/hdpvr-core.c:297
 usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
 really_probe+0x281/0x6d0 drivers/base/dd.c:548
 driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721
 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:454
 __device_attach+0x217/0x360 drivers/base/dd.c:894
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
 device_add+0xae6/0x16f0 drivers/base/core.c:2165
 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+0x281/0x6d0 drivers/base/dd.c:548
 driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721
 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:454
 __device_attach+0x217/0x360 drivers/base/dd.c:894
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
 device_add+0xae6/0x16f0 drivers/base/core.c:2165
 usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2536
 hub_port_connect drivers/usb/core/hub.c:5098 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5213 [inline]
 port_event drivers/usb/core/hub.c:5359 [inline]
 hub_event+0x1b5c/0x3640 drivers/usb/core/hub.c:5441
 process_one_work+0x92b/0x1530 kernel/workqueue.c:2269
 process_scheduled_works kernel/workqueue.c:2331 [inline]
 worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417
 kthread+0x318/0x420 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff8881d6a1c7e0
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 0 bytes to the right of
 64-byte region [ffff8881d6a1c7e0, ffff8881d6a1c820)
The buggy address belongs to the page:
page:ffffea00075a8700 refcount:1 mapcount:0 mapping:ffff8881da003180 index:0x0
flags: 0x200000000000200(slab)
raw: 0200000000000200 dead000000000100 dead000000000122 ffff8881da003180
raw: 0000000000000000 00000000802a002a 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881d6a1c700: fc fc fc fc fb fb fb fb fb fb fb fb fc fc fc fc
 ffff8881d6a1c780: fb fb fb fb fb fb fb fb fc fc fc fc 00 00 00 00
>ffff8881d6a1c800: 00 00 00 00 fc fc fc fc fb fb fb fb fb fb fb fb
                               ^
 ffff8881d6a1c880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8881d6a1c900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================

Crashes (10):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/08/18 12:44 https://github.com/google/kasan.git usb-fuzzer d0847550e22d 55bf8926 .config console log report syz C ci2-upstream-usb
2019/08/15 19:01 https://github.com/google/kasan.git usb-fuzzer d0847550e22d faeffb00 .config console log report syz C ci2-upstream-usb
2019/08/09 14:17 https://github.com/google/kasan.git usb-fuzzer e96407b49762 aff9e255 .config console log report syz C ci2-upstream-usb
2019/07/23 09:33 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 bb071d58 .config console log report syz C ci2-upstream-usb
2019/07/11 20:07 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 186a30b9 .config console log report syz C ci2-upstream-usb
2019/07/04 02:08 https://github.com/google/kasan.git usb-fuzzer 7829a896a587 55565fa0 .config console log report syz C ci2-upstream-usb
2019/07/01 22:29 https://github.com/google/kasan.git usb-fuzzer 7829a896a587 907bf746 .config console log report syz C ci2-upstream-usb
2019/09/09 07:55 https://github.com/google/kasan.git usb-fuzzer f0df5c1be1e9 a60cb4cd .config console log report ci2-upstream-usb
2019/09/02 16:35 https://github.com/google/kasan.git usb-fuzzer eea39f24f4a5 14544a56 .config console log report ci2-upstream-usb
2019/06/25 19:50 https://github.com/google/kasan.git usb-fuzzer 9939f56ee6c0 0a8d1a96 .config console log report ci2-upstream-usb
* Struck through repros no longer work on HEAD.