linux-kernel - Re: [syzbot] KMSAN: uninit-value in ax88772a_hw

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Date:   Sun, 19 Dec 2021 14:52:24 -0800
From:   syzbot <syzbot+8d179821571093c5f928@...kaller.appspotmail.com>
To:     andrew@...n.ch, davem@...emloft.net, glider@...gle.com,
        kuba@...nel.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, linux@...pel-privat.de,
        netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] KMSAN: uninit-value in ax88772a_hw_reset

syzbot has found a reproducer for 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=14ad9c43b00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=46a956fc7a887c60
dashboard link: https://syzkaller.appspot.com/bug?extid=8d179821571093c5f928
compiler:       clang version 14.0.0 (/usr/local/google/src/llvm-git-monorepo 2b554920f11c8b763cd9ed9003f4e19b919b8e1f), GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=101553cbb00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10187949b00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8d179821571093c5f928@...kaller.appspotmail.com

asix 1-1:0.0 (unnamed net_device) (uninitialized): Failed to read reg index 0x0016: -71
asix 1-1:0.0 (unnamed net_device) (uninitialized): Failed to write reg index 0x0000: -71
asix 1-1:0.0 (unnamed net_device) (uninitialized): Failed to enable hardware MII access
=====================================================
BUG: KMSAN: uninit-value in ax88772a_hw_reset+0xc55/0x12e0 drivers/net/usb/asix_devices.c:523 drivers/net/usb/asix_devices.c:523
 ax88772a_hw_reset+0xc55/0x12e0 drivers/net/usb/asix_devices.c:523 drivers/net/usb/asix_devices.c:523
 ax88772_bind+0x750/0x1770 drivers/net/usb/asix_devices.c:762 drivers/net/usb/asix_devices.c:762
 usbnet_probe+0x1284/0x4140 drivers/net/usb/usbnet.c:1747 drivers/net/usb/usbnet.c:1747
 usb_probe_interface+0xf19/0x1600 drivers/usb/core/driver.c:396 drivers/usb/core/driver.c:396
 really_probe+0x67d/0x1510 drivers/base/dd.c:596 drivers/base/dd.c:596
 __driver_probe_device+0x3e9/0x530 drivers/base/dd.c:751 drivers/base/dd.c:751
 driver_probe_device drivers/base/dd.c:781 [inline]
 driver_probe_device drivers/base/dd.c:781 [inline] drivers/base/dd.c:898
 __device_attach_driver+0x79f/0x1120 drivers/base/dd.c:898 drivers/base/dd.c:898
 bus_for_each_drv+0x2d6/0x3f0 drivers/base/bus.c:427 drivers/base/bus.c:427
 __device_attach+0x593/0x8e0 drivers/base/dd.c:969 drivers/base/dd.c:969
 device_initial_probe+0x4a/0x60 drivers/base/dd.c:1016 drivers/base/dd.c:1016
 bus_probe_device+0x17b/0x3e0 drivers/base/bus.c:487 drivers/base/bus.c:487
 device_add+0x1d3e/0x2400 drivers/base/core.c:3394 drivers/base/core.c:3394
 usb_set_configuration+0x37e9/0x3ed0 drivers/usb/core/message.c:2170 drivers/usb/core/message.c:2170
 usb_generic_driver_probe+0x13c/0x300 drivers/usb/core/generic.c:238 drivers/usb/core/generic.c:238
 usb_probe_device+0x309/0x570 drivers/usb/core/driver.c:293 drivers/usb/core/driver.c:293
 really_probe+0x67d/0x1510 drivers/base/dd.c:596 drivers/base/dd.c:596
 __driver_probe_device+0x3e9/0x530 drivers/base/dd.c:751 drivers/base/dd.c:751
 driver_probe_device drivers/base/dd.c:781 [inline]
 driver_probe_device drivers/base/dd.c:781 [inline] drivers/base/dd.c:898
 __device_attach_driver+0x79f/0x1120 drivers/base/dd.c:898 drivers/base/dd.c:898
 bus_for_each_drv+0x2d6/0x3f0 drivers/base/bus.c:427 drivers/base/bus.c:427
 __device_attach+0x593/0x8e0 drivers/base/dd.c:969 drivers/base/dd.c:969
 device_initial_probe+0x4a/0x60 drivers/base/dd.c:1016 drivers/base/dd.c:1016
 bus_probe_device+0x17b/0x3e0 drivers/base/bus.c:487 drivers/base/bus.c:487
 device_add+0x1d3e/0x2400 drivers/base/core.c:3394 drivers/base/core.c:3394
 usb_new_device+0x1b8e/0x2950 drivers/usb/core/hub.c:2563 drivers/usb/core/hub.c:2563
 hub_port_connect drivers/usb/core/hub.c:5353 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5497 [inline]
 port_event drivers/usb/core/hub.c:5643 [inline]
 hub_port_connect drivers/usb/core/hub.c:5353 [inline] drivers/usb/core/hub.c:5725
 hub_port_connect_change drivers/usb/core/hub.c:5497 [inline] drivers/usb/core/hub.c:5725
 port_event drivers/usb/core/hub.c:5643 [inline] drivers/usb/core/hub.c:5725
 hub_event+0x5ad2/0x8910 drivers/usb/core/hub.c:5725 drivers/usb/core/hub.c:5725
 process_one_work+0xdb9/0x1820 kernel/workqueue.c:2298 kernel/workqueue.c:2298
 worker_thread+0x10bc/0x21f0 kernel/workqueue.c:2445 kernel/workqueue.c:2445
 kthread+0x721/0x850 kernel/kthread.c:327 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30

Local variable smsr.i created at:
 asix_mdio_read_nopm+0xb9/0xa50 drivers/net/usb/asix_common.c:574 drivers/net/usb/asix_common.c:574
 ax88772a_hw_reset+0x83c/0x12e0 drivers/net/usb/asix_devices.c:511 drivers/net/usb/asix_devices.c:511

CPU: 1 PID: 115 Comm: kworker/1:2 Not tainted 5.16.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usb_hub_wq hub_event
=====================================================