syzbot


KMSAN: uninit-value in i2c_w (2)

Status: fixed on 2020/02/18 14:31
Subsystems: media usb
[Documentation on labels]
Reported-by: syzbot+99706d6390be1ac542a2@syzkaller.appspotmail.com
Fix commit: de89d0864f66 media: gspca: zero usb_buf
First crash: 1645d, last: 1640d
Discussions (8)
Title Replies (including bot) Last reply
[PATCH 5.5 00/23] 5.5.2-stable review 31 (31) 2020/02/08 16:13
[PATCH 4.4 00/53] 4.4.213-stable review 63 (63) 2020/02/05 22:37
[PATCH 5.4 00/90] 5.4.18-stable review 107 (107) 2020/02/05 21:21
[PATCH 4.19 00/70] 4.19.102-stable review 77 (77) 2020/02/05 14:42
[PATCH 4.14 00/89] 4.14.170-stable review 93 (93) 2020/02/04 17:19
[PATCH 4.9 00/68] 4.9.213-stable review 72 (72) 2020/02/04 17:18
[PATCH 0/5] Fix various syzbot errors 10 (10) 2019/11/12 09:53
KMSAN: uninit-value in i2c_w (2) 0 (1) 2019/11/08 17:04
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KMSAN: uninit-value in i2c_w usb media C 2 1786d 1785d 13/26 fixed on 2019/10/15 23:40
Last patch testing requests (1)
Created Duration User Patch Repo Result
2019/11/11 14:26 20m hverkuil@xs4all.nl patch https://github.com/google/kmsan.git master OK

Sample crash report:
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 1-1: config 0 descriptor??
usb 1-1: string descriptor 0 read error: -71
gspca_main: gspca_topro-2.14.0 probing 06a2:6810
gspca_topro: reg_w err -71
=====================================================
BUG: KMSAN: uninit-value in i2c_w+0xb7a/0xd70 drivers/media/usb/gspca/topro.c:1031
CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.4.0-rc3+ #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+0x14a/0x2f0 mm/kmsan/kmsan_report.c:110
 __msan_warning+0x73/0xf0 mm/kmsan/kmsan_instr.c:245
 i2c_w+0xb7a/0xd70 drivers/media/usb/gspca/topro.c:1031
 probe_6810 drivers/media/usb/gspca/topro.c:1114 [inline]
 sd_init+0xc10/0x7c10 drivers/media/usb/gspca/topro.c:4069
 gspca_dev_probe2+0xe93/0x2230 drivers/media/usb/gspca/gspca.c:1532
 gspca_dev_probe+0x346/0x3b0 drivers/media/usb/gspca/gspca.c:1605
 sd_probe+0x8d/0xa0 drivers/media/usb/gspca/gl860/gl860.c:511
 usb_probe_interface+0xd19/0x1310 drivers/usb/core/driver.c:361
 really_probe+0xd91/0x1f90 drivers/base/dd.c:552
 driver_probe_device+0x1ba/0x510 drivers/base/dd.c:721
 __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:828
 bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:430
 __device_attach+0x489/0x750 drivers/base/dd.c:894
 device_initial_probe+0x4a/0x60 drivers/base/dd.c:941
 bus_probe_device+0x131/0x390 drivers/base/bus.c:490
 device_add+0x25b5/0x2df0 drivers/base/core.c:2201
 usb_set_configuration+0x309f/0x3710 drivers/usb/core/message.c:2027
 generic_probe+0xe7/0x280 drivers/usb/core/generic.c:210
 usb_probe_device+0x146/0x200 drivers/usb/core/driver.c:266
 really_probe+0xd91/0x1f90 drivers/base/dd.c:552
 driver_probe_device+0x1ba/0x510 drivers/base/dd.c:721
 __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:828
 bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:430
 __device_attach+0x489/0x750 drivers/base/dd.c:894
 device_initial_probe+0x4a/0x60 drivers/base/dd.c:941
 bus_probe_device+0x131/0x390 drivers/base/bus.c:490
 device_add+0x25b5/0x2df0 drivers/base/core.c:2201
 usb_new_device+0x23e5/0x2fb0 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+0x581d/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:151 [inline]
 kmsan_internal_poison_shadow+0x60/0x110 mm/kmsan/kmsan.c:134
 kmsan_slab_alloc+0xaa/0x130 mm/kmsan/kmsan_hooks.c:88
 slab_alloc_node mm/slub.c:2792 [inline]
 slab_alloc mm/slub.c:2801 [inline]
 kmem_cache_alloc_trace+0x8c5/0xd20 mm/slub.c:2818
 kmalloc include/linux/slab.h:556 [inline]
 gspca_dev_probe2+0x30d/0x2230 drivers/media/usb/gspca/gspca.c:1464
 gspca_dev_probe+0x346/0x3b0 drivers/media/usb/gspca/gspca.c:1605
 sd_probe+0x8d/0xa0 drivers/media/usb/gspca/gl860/gl860.c:511
 usb_probe_interface+0xd19/0x1310 drivers/usb/core/driver.c:361
 really_probe+0xd91/0x1f90 drivers/base/dd.c:552
 driver_probe_device+0x1ba/0x510 drivers/base/dd.c:721
 __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:828
 bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:430
 __device_attach+0x489/0x750 drivers/base/dd.c:894
 device_initial_probe+0x4a/0x60 drivers/base/dd.c:941
 bus_probe_device+0x131/0x390 drivers/base/bus.c:490
 device_add+0x25b5/0x2df0 drivers/base/core.c:2201
 usb_set_configuration+0x309f/0x3710 drivers/usb/core/message.c:2027
 generic_probe+0xe7/0x280 drivers/usb/core/generic.c:210
 usb_probe_device+0x146/0x200 drivers/usb/core/driver.c:266
 really_probe+0xd91/0x1f90 drivers/base/dd.c:552
 driver_probe_device+0x1ba/0x510 drivers/base/dd.c:721
 __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:828
 bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:430
 __device_attach+0x489/0x750 drivers/base/dd.c:894
 device_initial_probe+0x4a/0x60 drivers/base/dd.c:941
 bus_probe_device+0x131/0x390 drivers/base/bus.c:490
 device_add+0x25b5/0x2df0 drivers/base/core.c:2201
 usb_new_device+0x23e5/0x2fb0 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+0x581d/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 (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/10/23 11:48 https://github.com/google/kmsan.git master 3c8ca70889aa d0686497 .config console log report syz C ci-upstream-kmsan-gce
2019/10/28 07:07 https://github.com/google/kmsan.git master d86c15562d02 25bb509e .config console log report ci-upstream-kmsan-gce
2019/10/23 11:11 https://github.com/google/kmsan.git master 3c8ca70889aa d0686497 .config console log report ci-upstream-kmsan-gce
* Struck through repros no longer work on HEAD.