linux-kernel - Re: KMSAN: uninit-value in gtco

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Message-ID: <00000000000056b055058fef9679@google.com>
Date:   Mon, 12 Aug 2019 11:21:05 -0700
From:   syzbot <syzbot+bb54195a43a54b1e5e5e@...kaller.appspotmail.com>
To:     dmitry.torokhov@...il.com, glider@...gle.com,
        granthernandez@...gle.com, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: KMSAN: uninit-value in gtco_probe

syzbot has found a reproducer for the following crash on:

HEAD commit:    61ccdad1 Revert "drm/bochs: Use shadow buffer for bochs fr..
git tree:       kmsan
console output: https://syzkaller.appspot.com/x/log.txt?x=106e8536600000
kernel config:  https://syzkaller.appspot.com/x/.config?x=27abc558ecb16a3b
dashboard link: https://syzkaller.appspot.com/bug?extid=bb54195a43a54b1e5e5e
compiler:       clang version 9.0.0 (/home/glider/llvm/clang  
80fee25776c2fb61e74c1ecb1a523375c2500b69)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1766194a600000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13d5879a600000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+bb54195a43a54b1e5e5e@...kaller.appspotmail.com

usb 1-1: config 0 has no interface number 0
usb 1-1: New USB device found, idVendor=078c, idProduct=1002,  
bcdDevice=e6.47
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 1-1: config 0 descriptor??
gtco 1-1:0.219: Collection level already at zero
==================================================================
BUG: KMSAN: uninit-value in parse_hid_report_descriptor  
drivers/input/tablet/gtco.c:297 [inline]
BUG: KMSAN: uninit-value in gtco_probe+0x18c7/0x3520  
drivers/input/tablet/gtco.c:938
CPU: 1 PID: 621 Comm: kworker/1:1 Not tainted 5.3.0-rc3+ #17
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
  parse_hid_report_descriptor drivers/input/tablet/gtco.c:297 [inline]
  gtco_probe+0x18c7/0x3520 drivers/input/tablet/gtco.c:938
  usb_probe_interface+0xd19/0x1310 drivers/usb/core/driver.c:361
  really_probe+0x1373/0x1dc0 drivers/base/dd.c:552
  driver_probe_device+0x1ba/0x510 drivers/base/dd.c:709
  __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:816
  bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:454
  __device_attach+0x489/0x750 drivers/base/dd.c:882
  device_initial_probe+0x4a/0x60 drivers/base/dd.c:929
  bus_probe_device+0x131/0x390 drivers/base/bus.c:514
  device_add+0x25b5/0x2df0 drivers/base/core.c:2114
  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+0x1373/0x1dc0 drivers/base/dd.c:552
  driver_probe_device+0x1ba/0x510 drivers/base/dd.c:709
  __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:816
  bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:454
  __device_attach+0x489/0x750 drivers/base/dd.c:882
  device_initial_probe+0x4a/0x60 drivers/base/dd.c:929
  bus_probe_device+0x131/0x390 drivers/base/bus.c:514
  device_add+0x25b5/0x2df0 drivers/base/core.c:2114
  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:187 [inline]
  kmsan_internal_chain_origin+0xcc/0x150 mm/kmsan/kmsan.c:345
  __msan_chain_origin+0x6b/0xe0 mm/kmsan/kmsan_instr.c:190
  parse_hid_report_descriptor drivers/input/tablet/gtco.c:298 [inline]
  gtco_probe+0x1a7c/0x3520 drivers/input/tablet/gtco.c:938
  usb_probe_interface+0xd19/0x1310 drivers/usb/core/driver.c:361
  really_probe+0x1373/0x1dc0 drivers/base/dd.c:552
  driver_probe_device+0x1ba/0x510 drivers/base/dd.c:709
  __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:816
  bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:454
  __device_attach+0x489/0x750 drivers/base/dd.c:882
  device_initial_probe+0x4a/0x60 drivers/base/dd.c:929
  bus_probe_device+0x131/0x390 drivers/base/bus.c:514
  device_add+0x25b5/0x2df0 drivers/base/core.c:2114
  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+0x1373/0x1dc0 drivers/base/dd.c:552
  driver_probe_device+0x1ba/0x510 drivers/base/dd.c:709
  __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:816
  bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:454
  __device_attach+0x489/0x750 drivers/base/dd.c:882
  device_initial_probe+0x4a/0x60 drivers/base/dd.c:929
  bus_probe_device+0x131/0x390 drivers/base/bus.c:514
  device_add+0x25b5/0x2df0 drivers/base/core.c:2114
  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: ----globalval.i@...o_probe
Variable was created at:
  parse_hid_report_descriptor drivers/input/tablet/gtco.c:221 [inline]
  gtco_probe+0xcd6/0x3520 drivers/input/tablet/gtco.c:938
  usb_probe_interface+0xd19/0x1310 drivers/usb/core/driver.c:361
==================================================================