linux-kernel - KMSAN: uninit-value in smsc95xx_wait

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Message-ID: <000000000000302d82058ee5002d@google.com>
Date:   Tue, 30 Jul 2019 05:18:05 -0700
From:   syzbot <syzbot+136c17d735f025fc86a7@...kaller.appspotmail.com>
To:     UNGLinuxDriver@...rochip.com, davem@...emloft.net,
        glider@...gle.com, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, netdev@...r.kernel.org,
        steve.glendinning@...well.net, syzkaller-bugs@...glegroups.com
Subject: KMSAN: uninit-value in smsc95xx_wait_eeprom

Hello,

syzbot found the following crash on:

HEAD commit:    beaab8a3 fix KASAN build
git tree:       kmsan
console output: https://syzkaller.appspot.com/x/log.txt?x=1685d8bfa00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4db781fe35a84ef5
dashboard link: https://syzkaller.appspot.com/bug?extid=136c17d735f025fc86a7
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+136c17d735f025fc86a7@...kaller.appspotmail.com

usb 1-1: New USB device found, idVendor=0424, idProduct=9908,  
bcdDevice=6a.5e
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 1-1: config 0 descriptor??
smsc95xx v1.0.6
==================================================================
BUG: KMSAN: uninit-value in smsc95xx_wait_eeprom+0x1fb/0x3d0  
drivers/net/usb/smsc95xx.c:300
CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.2.0+ #15
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+0x162/0x2d0 mm/kmsan/kmsan_report.c:109
  __msan_warning+0x75/0xe0 mm/kmsan/kmsan_instr.c:294
  smsc95xx_wait_eeprom+0x1fb/0x3d0 drivers/net/usb/smsc95xx.c:300
  smsc95xx_read_eeprom+0x3c2/0x920 drivers/net/usb/smsc95xx.c:357
  smsc95xx_init_mac_address drivers/net/usb/smsc95xx.c:914 [inline]
  smsc95xx_bind+0x467/0x1690 drivers/net/usb/smsc95xx.c:1286
  usbnet_probe+0x10d3/0x3950 drivers/net/usb/usbnet.c:1722
  usb_probe_interface+0xd19/0x1310 drivers/usb/core/driver.c:361
  really_probe+0x1344/0x1d90 drivers/base/dd.c:513
  driver_probe_device+0x1ba/0x510 drivers/base/dd.c:670
  __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:777
  bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:454
  __device_attach+0x489/0x750 drivers/base/dd.c:843
  device_initial_probe+0x4a/0x60 drivers/base/dd.c:890
  bus_probe_device+0x131/0x390 drivers/base/bus.c:514
  device_add+0x25b5/0x2df0 drivers/base/core.c:2111
  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+0x1344/0x1d90 drivers/base/dd.c:513
  driver_probe_device+0x1ba/0x510 drivers/base/dd.c:670
  __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:777
  bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:454
  __device_attach+0x489/0x750 drivers/base/dd.c:843
  device_initial_probe+0x4a/0x60 drivers/base/dd.c:890
  bus_probe_device+0x131/0x390 drivers/base/bus.c:514
  device_add+0x25b5/0x2df0 drivers/base/core.c:2111
  usb_new_device+0x23e5/0x2fb0 drivers/usb/core/hub.c:2534
  hub_port_connect drivers/usb/core/hub.c:5089 [inline]
  hub_port_connect_change drivers/usb/core/hub.c:5204 [inline]
  port_event drivers/usb/core/hub.c:5350 [inline]
  hub_event+0x5853/0x7320 drivers/usb/core/hub.c:5432
  process_one_work+0x1572/0x1f00 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: ----buf.i.i@...c95xx_wait_eeprom
Variable was created at:
  __smsc95xx_read_reg drivers/net/usb/smsc95xx.c:80 [inline]
  smsc95xx_read_reg drivers/net/usb/smsc95xx.c:144 [inline]
  smsc95xx_wait_eeprom+0xb6/0x3d0 drivers/net/usb/smsc95xx.c:294
  smsc95xx_read_eeprom+0x3c2/0x920 drivers/net/usb/smsc95xx.c:357
==================================================================

---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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