KMSAN: uninit-value in get_term_name

From: syzbot
Date: Mon Oct 28 2019 - 06:32:12 EST

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Hello,

syzbot found the following crash on:

HEAD commit: d86c1556 kmsan: add printk_test()
git tree: https://github.com/google/kmsan.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=16c4ef54e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=c07a3d4f8a59e198
dashboard link: https://syzkaller.appspot.com/bug?extid=8f2612936028bfd28f28
compiler: clang version 9.0.0 (/home/glider/llvm/clang 80fee25776c2fb61e74c1ecb1a523375c2500b69)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11b96c4ce00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11a51ca8e00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+8f2612936028bfd28f28@xxxxxxxxxxxxxxxxxxxxxxxxx

usb 1-1: New USB device found, idVendor=1d6b, idProduct=0101, bcdDevice= 0.40
usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 1-1: Product: syz
usb 1-1: Manufacturer: syz
usb 1-1: SerialNumber: syz
=====================================================
BUG: KMSAN: uninit-value in get_term_name+0x1b7/0xad0 sound/usb/mixer.c:652
CPU: 1 PID: 30 Comm: kworker/1:1 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+0x128/0x220 mm/kmsan/kmsan_report.c:108
__msan_warning+0x73/0xe0 mm/kmsan/kmsan_instr.c:245
get_term_name+0x1b7/0xad0 sound/usb/mixer.c:652
__build_feature_ctl+0x11f1/0x29e0 sound/usb/mixer.c:1628
build_feature_ctl sound/usb/mixer.c:1709 [inline]
parse_audio_feature_unit sound/usb/mixer.c:1921 [inline]
parse_audio_unit+0x2308/0x7490 sound/usb/mixer.c:2753
snd_usb_mixer_controls sound/usb/mixer.c:3095 [inline]
snd_usb_create_mixer+0x1d7c/0x4070 sound/usb/mixer.c:3445
usb_audio_probe+0x286b/0x3eb0 sound/usb/card.c:653
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 stored to memory at:
kmsan_save_stack_with_flags mm/kmsan/kmsan.c:151 [inline]
kmsan_internal_chain_origin+0xbd/0x180 mm/kmsan/kmsan.c:319
__msan_chain_origin+0x6b/0xd0 mm/kmsan/kmsan_instr.c:179
parse_term_proc_unit+0x73d/0x7e0 sound/usb/mixer.c:896
__check_input_term+0x13ef/0x2360 sound/usb/mixer.c:989
check_input_term sound/usb/mixer.c:1008 [inline]
parse_audio_feature_unit sound/usb/mixer.c:1875 [inline]
parse_audio_unit+0x1478/0x7490 sound/usb/mixer.c:2753
snd_usb_mixer_controls sound/usb/mixer.c:3095 [inline]
snd_usb_create_mixer+0x1d7c/0x4070 sound/usb/mixer.c:3445
usb_audio_probe+0x286b/0x3eb0 sound/usb/card.c:653
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+0x60/0x120 mm/kmsan/kmsan.c:134
kmsan_slab_alloc+0xaa/0x120 mm/kmsan/kmsan_hooks.c:88
slab_alloc_node mm/slub.c:2792 [inline]
slab_alloc mm/slub.c:2801 [inline]
__kmalloc+0x28e/0x430 mm/slub.c:3832
kmalloc include/linux/slab.h:561 [inline]
usb_get_configuration+0x50d/0x76a0 drivers/usb/core/config.c:857
usb_enumerate_device drivers/usb/core/hub.c:2369 [inline]
usb_new_device+0x224/0x2fb0 drivers/usb/core/hub.c:2505
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
=====================================================

---
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Next message: syzbot: "KMSAN: uninit-value in lg4ff_set_autocenter_default"
Previous message: Konstantin Khlebnikov: "[PATCH RFC] fs/fcntl: add fcntl F_GET_RSS"
Next in thread: Takashi Iwai: "Re: KMSAN: uninit-value in get_term_name"
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