linux-kernel - [syzbot] kmsan boot error: KMSAN: uninit-value in genius

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Message-ID: <0000000000000fa9e405d35567b3@google.com>
Date:   Fri, 17 Dec 2021 02:57:18 -0800
From:   syzbot <syzbot+ea4fcd3ec1e6f90262bb@...kaller.appspotmail.com>
To:     dmitry.torokhov@...il.com, glider@...gle.com,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: [syzbot] kmsan boot error: KMSAN: uninit-value in genius_detect

Hello,

syzbot found the following issue on:

HEAD commit:    b0a8b5053e8b kmsan: core: add dependency on DEBUG_KERNEL
git tree:       https://github.com/google/kmsan.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=10a5adcdb00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=46a956fc7a887c60
dashboard link: https://syzkaller.appspot.com/bug?extid=ea4fcd3ec1e6f90262bb
compiler:       clang version 14.0.0 (/usr/local/google/src/llvm-git-monorepo 2b554920f11c8b763cd9ed9003f4e19b919b8e1f), GNU ld (GNU Binutils for Debian) 2.35.2

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ea4fcd3ec1e6f90262bb@...kaller.appspotmail.com

input: AT Translated Set 2 keyboard as /devices/platform/i8042/serio0/input/input2
=====================================================
BUG: KMSAN: uninit-value in genius_detect+0x4ec/0x6f0 drivers/input/mouse/psmouse-base.c:568
 genius_detect+0x4ec/0x6f0 drivers/input/mouse/psmouse-base.c:568
 psmouse_do_detect drivers/input/mouse/psmouse-base.c:1046 [inline]
 psmouse_try_protocol drivers/input/mouse/psmouse-base.c:1060 [inline]
 psmouse_extensions+0x1964/0x1b60 drivers/input/mouse/psmouse-base.c:1216
 psmouse_switch_protocol+0x184/0xbb0 drivers/input/mouse/psmouse-base.c:1579
 psmouse_connect+0x14cc/0x2260 drivers/input/mouse/psmouse-base.c:1669
 serio_connect_driver drivers/input/serio/serio.c:47 [inline]
 serio_driver_probe+0xc7/0x130 drivers/input/serio/serio.c:778
 really_probe+0x67d/0x1510 drivers/base/dd.c:596
 __driver_probe_device+0x3e9/0x530 drivers/base/dd.c:751
 driver_probe_device drivers/base/dd.c:781 [inline]
 __driver_attach+0x6a6/0x1350 drivers/base/dd.c:1140
 bus_for_each_dev+0x20e/0x340 drivers/base/bus.c:301
 driver_attach+0x89/0xb0 drivers/base/dd.c:1157
 serio_attach_driver drivers/input/serio/serio.c:807 [inline]
 serio_handle_event+0x11fb/0x2760 drivers/input/serio/serio.c:227
 process_one_work+0xdb9/0x1820 kernel/workqueue.c:2298
 worker_thread+0x10bc/0x21f0 kernel/workqueue.c:2445
 kthread+0x721/0x850 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30

Uninit was stored to memory at:
 __ps2_command+0x23fe/0x25b0 drivers/input/serio/libps2.c:299
 ps2_command+0x124/0x210 drivers/input/serio/libps2.c:332
 genius_detect+0x2f9/0x6f0 drivers/input/mouse/psmouse-base.c:564
 psmouse_do_detect drivers/input/mouse/psmouse-base.c:1046 [inline]
 psmouse_try_protocol drivers/input/mouse/psmouse-base.c:1060 [inline]
 psmouse_extensions+0x1964/0x1b60 drivers/input/mouse/psmouse-base.c:1216
 psmouse_switch_protocol+0x184/0xbb0 drivers/input/mouse/psmouse-base.c:1579
 psmouse_connect+0x14cc/0x2260 drivers/input/mouse/psmouse-base.c:1669
 serio_connect_driver drivers/input/serio/serio.c:47 [inline]
 serio_driver_probe+0xc7/0x130 drivers/input/serio/serio.c:778
 really_probe+0x67d/0x1510 drivers/base/dd.c:596
 __driver_probe_device+0x3e9/0x530 drivers/base/dd.c:751
 driver_probe_device drivers/base/dd.c:781 [inline]
 __driver_attach+0x6a6/0x1350 drivers/base/dd.c:1140
 bus_for_each_dev+0x20e/0x340 drivers/base/bus.c:301
 driver_attach+0x89/0xb0 drivers/base/dd.c:1157
 serio_attach_driver drivers/input/serio/serio.c:807 [inline]
 serio_handle_event+0x11fb/0x2760 drivers/input/serio/serio.c:227
 process_one_work+0xdb9/0x1820 kernel/workqueue.c:2298
 worker_thread+0x10bc/0x21f0 kernel/workqueue.c:2445
 kthread+0x721/0x850 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30

Uninit was stored to memory at:
 __ps2_command+0xa33/0x25b0 drivers/input/serio/libps2.c:253
 ps2_command+0x124/0x210 drivers/input/serio/libps2.c:332
 genius_detect+0x2f9/0x6f0 drivers/input/mouse/psmouse-base.c:564
 psmouse_do_detect drivers/input/mouse/psmouse-base.c:1046 [inline]
 psmouse_try_protocol drivers/input/mouse/psmouse-base.c:1060 [inline]
 psmouse_extensions+0x1964/0x1b60 drivers/input/mouse/psmouse-base.c:1216
 psmouse_switch_protocol+0x184/0xbb0 drivers/input/mouse/psmouse-base.c:1579
 psmouse_connect+0x14cc/0x2260 drivers/input/mouse/psmouse-base.c:1669
 serio_connect_driver drivers/input/serio/serio.c:47 [inline]
 serio_driver_probe+0xc7/0x130 drivers/input/serio/serio.c:778
 really_probe+0x67d/0x1510 drivers/base/dd.c:596
 __driver_probe_device+0x3e9/0x530 drivers/base/dd.c:751
 driver_probe_device drivers/base/dd.c:781 [inline]
 __driver_attach+0x6a6/0x1350 drivers/base/dd.c:1140
 bus_for_each_dev+0x20e/0x340 drivers/base/bus.c:301
 driver_attach+0x89/0xb0 drivers/base/dd.c:1157
 serio_attach_driver drivers/input/serio/serio.c:807 [inline]
 serio_handle_event+0x11fb/0x2760 drivers/input/serio/serio.c:227
 process_one_work+0xdb9/0x1820 kernel/workqueue.c:2298
 worker_thread+0x10bc/0x21f0 kernel/workqueue.c:2445
 kthread+0x721/0x850 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30

Local variable param created at:
 genius_detect+0x6b/0x6f0 drivers/input/mouse/psmouse-base.c:548
 psmouse_do_detect drivers/input/mouse/psmouse-base.c:1046 [inline]
 psmouse_try_protocol drivers/input/mouse/psmouse-base.c:1060 [inline]
 psmouse_extensions+0x1964/0x1b60 drivers/input/mouse/psmouse-base.c:1216

CPU: 0 PID: 7 Comm: kworker/0:1 Not tainted 5.16.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_long serio_handle_event
=====================================================


---
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