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Date:   Tue, 15 Oct 2019 14:22:07 -0700
Message-ID: <0000000000009763320594f993ee@google.com>
Subject: KMSAN: uninit-value in asix_mdio_write
From:   syzbot <syzbot+7dc7c28d4577bbe55b10@syzkaller.appspotmail.com>
To:     davem@davemloft.net, glider@google.com, gregkh@linuxfoundation.org,
        hslester96@gmail.com, kstewart@linuxfoundation.org,
        linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org,
        netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com,
        tglx@linutronix.de
Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes
Sender: linux-kernel-owner@vger.kernel.org
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Hello,

syzbot found the following crash on:

HEAD commit:    c2453450 kmsan: kcov: prettify the code unpoisoning area->..
git tree:       https://github.com/google/kmsan.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=1159ab53600000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3684f3c73f43899a
dashboard link: https://syzkaller.appspot.com/bug?extid=7dc7c28d4577bbe55b10
compiler:       clang version 9.0.0 (/home/glider/llvm/clang  
80fee25776c2fb61e74c1ecb1a523375c2500b69)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17e7276f600000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15609b30e00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+7dc7c28d4577bbe55b10@syzkaller.appspotmail.com

asix 1-1:0.145 (unnamed net_device) (uninitialized): Failed to enable  
software MII access
asix 1-1:0.145 (unnamed net_device) (uninitialized): Failed to read reg  
index 0x0000: -71
=====================================================
BUG: KMSAN: uninit-value in asix_mdio_write+0x3fa/0x8d0  
drivers/net/usb/asix_common.c:496
CPU: 1 PID: 17 Comm: kworker/1:0 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:109
  __msan_warning+0x73/0xf0 mm/kmsan/kmsan_instr.c:245
  asix_mdio_write+0x3fa/0x8d0 drivers/net/usb/asix_common.c:496
  asix_phy_reset+0xd8/0x2d0 drivers/net/usb/asix_devices.c:208
  ax88172_bind+0x780/0xbd0 drivers/net/usb/asix_devices.c:272
  usbnet_probe+0x10d3/0x39d0 drivers/net/usb/usbnet.c:1730
  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

Local variable description: ----smsr@asix_mdio_write
Variable was created at:
  asix_mdio_write+0xc7/0x8d0 drivers/net/usb/asix_common.c:480
  asix_mdio_write+0xc7/0x8d0 drivers/net/usb/asix_common.c:480
=====================================================


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