linux-kernel - KMSAN: uninit-value in batadv_hard_if

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Message-ID: <0000000000006120c905952febbd@google.com>
Date:   Fri, 18 Oct 2019 07:12:08 -0700
From:   syzbot <syzbot+0183453ce4de8bdf9214@...kaller.appspotmail.com>
To:     a@...table.cc, b.a.t.m.a.n@...ts.open-mesh.org,
        davem@...emloft.net, glider@...gle.com,
        linux-kernel@...r.kernel.org, mareklindner@...mailbox.ch,
        netdev@...r.kernel.org, sven@...fation.org, sw@...onwunderlich.de,
        syzkaller-bugs@...glegroups.com
Subject: KMSAN: uninit-value in batadv_hard_if_event

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=10b0c06b600000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3684f3c73f43899a
dashboard link: https://syzkaller.appspot.com/bug?extid=0183453ce4de8bdf9214
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+0183453ce4de8bdf9214@...kaller.appspotmail.com

usb 1-1: config 0 has no interface number 0
usb 1-1: New USB device found, idVendor=0411, idProduct=0012,  
bcdDevice=56.5f
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 1-1: config 0 descriptor??
=====================================================
BUG: KMSAN: uninit-value in batadv_check_known_mac_addr  
net/batman-adv/hard-interface.c:511 [inline]
BUG: KMSAN: uninit-value in batadv_hardif_add_interface  
net/batman-adv/hard-interface.c:942 [inline]
BUG: KMSAN: uninit-value in batadv_hard_if_event+0x23c0/0x3260  
net/batman-adv/hard-interface.c:1032
CPU: 0 PID: 13223 Comm: kworker/0:3 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
  batadv_check_known_mac_addr net/batman-adv/hard-interface.c:511 [inline]
  batadv_hardif_add_interface net/batman-adv/hard-interface.c:942 [inline]
  batadv_hard_if_event+0x23c0/0x3260 net/batman-adv/hard-interface.c:1032
  notifier_call_chain kernel/notifier.c:95 [inline]
  __raw_notifier_call_chain kernel/notifier.c:396 [inline]
  raw_notifier_call_chain+0x13d/0x240 kernel/notifier.c:403
  call_netdevice_notifiers_info net/core/dev.c:1749 [inline]
  call_netdevice_notifiers_extack net/core/dev.c:1761 [inline]
  call_netdevice_notifiers net/core/dev.c:1775 [inline]
  register_netdevice+0x2126/0x26a0 net/core/dev.c:8810
  register_netdev+0x93/0xd0 net/core/dev.c:8901
  rtl8150_probe+0x11ef/0x14a0 drivers/net/usb/rtl8150.c:916
  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:150 [inline]
  kmsan_internal_chain_origin+0xbd/0x170 mm/kmsan/kmsan.c:317
  kmsan_memcpy_memmove_metadata+0x25c/0x2e0 mm/kmsan/kmsan.c:253
  kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:273
  __msan_memcpy+0x56/0x70 mm/kmsan/kmsan_instr.c:129
  set_ethernet_addr drivers/net/usb/rtl8150.c:282 [inline]
  rtl8150_probe+0x1143/0x14a0 drivers/net/usb/rtl8150.c:912
  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: ----node_id.i@...8150_probe
Variable was created at:
  get_registers drivers/net/usb/rtl8150.c:911 [inline]
  set_ethernet_addr drivers/net/usb/rtl8150.c:281 [inline]
  rtl8150_probe+0xdc8/0x14a0 drivers/net/usb/rtl8150.c:912
  get_registers drivers/net/usb/rtl8150.c:911 [inline]
  set_ethernet_addr drivers/net/usb/rtl8150.c:281 [inline]
  rtl8150_probe+0xdc8/0x14a0 drivers/net/usb/rtl8150.c:912
=====================================================


---
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