linux-kernel - KMSAN: uninit-value in dvb_usb_adapter_dvb

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Date:   Fri, 08 Nov 2019 05:24:10 -0800
From:   syzbot <syzbot+ec869945d3dde5f33b43@...kaller.appspotmail.com>
To:     glider@...gle.com, hverkuil-cisco@...all.nl,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        mail@...iej.szmigiero.name, mchehab@...nel.org,
        syzkaller-bugs@...glegroups.com
Subject: KMSAN: uninit-value in dvb_usb_adapter_dvb_init

Hello,

syzbot found the following crash on:

HEAD commit:    6f88939b kmsan: don't unpoison memory in do_read_cache_pag..
git tree:       https://github.com/google/kmsan.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=101311a2e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=9e324dfe9c7b0360
dashboard link: https://syzkaller.appspot.com/bug?extid=ec869945d3dde5f33b43
compiler:       clang version 9.0.0 (/home/glider/llvm/clang  
80fee25776c2fb61e74c1ecb1a523375c2500b69)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+ec869945d3dde5f33b43@...kaller.appspotmail.com

vp7045: USB control message 'out' went wrong.
vp7045: USB control message 'out' went wrong.
vp7045: USB control message 'out' went wrong.
vp7045: USB control message 'out' went wrong.
=====================================================
BUG: KMSAN: uninit-value in mac_address_string+0xcd5/0x1000  
lib/vsprintf.c:604
CPU: 0 PID: 13542 Comm: kworker/0:7 Not tainted 5.4.0-rc5+ #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
  mac_address_string+0xcd5/0x1000 lib/vsprintf.c:604
  pointer+0x56d/0x1d10 lib/vsprintf.c:2148
  vsnprintf+0x1c0c/0x3210 lib/vsprintf.c:2514
  vscnprintf+0xc2/0x180 lib/vsprintf.c:2613
  vprintk_store+0xef/0x11e0 kernel/printk/printk.c:1922
  vprintk_emit+0x2c6/0x860 kernel/printk/printk.c:1984
  vprintk_default+0x90/0xa0 kernel/printk/printk.c:2029
  vprintk_func+0x635/0x810 kernel/printk/printk_safe.c:386
  printk+0x180/0x1c3 kernel/printk/printk.c:2062
  dvb_usb_adapter_dvb_init+0x90e/0x13f0  
drivers/media/usb/dvb-usb/dvb-usb-dvb.c:166
  dvb_usb_adapter_init drivers/media/usb/dvb-usb/dvb-usb-init.c:83 [inline]
  dvb_usb_init drivers/media/usb/dvb-usb/dvb-usb-init.c:173 [inline]
  dvb_usb_device_init+0x22fe/0x2e10  
drivers/media/usb/dvb-usb/dvb-usb-init.c:287
  vp7045_usb_probe+0x73/0x80 drivers/media/usb/dvb-usb/vp7045.c:164
  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:2202
  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:2202
  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
  vp7045_read_eeprom drivers/media/usb/dvb-usb/vp7045.c:123 [inline]
  vp7045_read_mac_addr+0x62e/0xbe0 drivers/media/usb/dvb-usb/vp7045.c:132
  dvb_usb_adapter_dvb_init+0x890/0x13f0  
drivers/media/usb/dvb-usb/dvb-usb-dvb.c:165
  dvb_usb_adapter_init drivers/media/usb/dvb-usb/dvb-usb-init.c:83 [inline]
  dvb_usb_init drivers/media/usb/dvb-usb/dvb-usb-init.c:173 [inline]
  dvb_usb_device_init+0x22fe/0x2e10  
drivers/media/usb/dvb-usb/dvb-usb-init.c:287
  vp7045_usb_probe+0x73/0x80 drivers/media/usb/dvb-usb/vp7045.c:164
  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:2202
  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:2202
  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

Local variable description: ----br.i@...045_read_mac_addr
Variable was created at:
  vp7045_read_eeprom drivers/media/usb/dvb-usb/vp7045.c:119 [inline]
  vp7045_read_mac_addr+0x7b/0xbe0 drivers/media/usb/dvb-usb/vp7045.c:132
  vp7045_read_eeprom drivers/media/usb/dvb-usb/vp7045.c:119 [inline]
  vp7045_read_mac_addr+0x7b/0xbe0 drivers/media/usb/dvb-usb/vp7045.c:132
=====================================================


---
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