linux-kernel - [syzbot] [usb?] KMSAN: uninit-value in mii_nway

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Message-ID: <67b323a4.050a0220.173698.002a.GAE@google.com>
Date: Mon, 17 Feb 2025 03:55:16 -0800
From: syzbot <syzbot+3361c2d6f78a3e0892f9@...kaller.appspotmail.com>
To: andrew+netdev@...n.ch, davem@...emloft.net, edumazet@...gle.com, 
	kuba@...nel.org, linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org, 
	netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [usb?] KMSAN: uninit-value in mii_nway_restart (2)

Hello,

syzbot found the following issue on:

HEAD commit:    128c8f96eb86 Merge tag 'drm-fixes-2025-02-14' of https://g..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=11546098580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=264db44f1897cdc3
dashboard link: https://syzkaller.appspot.com/bug?extid=3361c2d6f78a3e0892f9
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17d9d9b0580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1039d9b0580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/7aa6f3aa12c5/disk-128c8f96.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/7ca2c0dbfd2f/vmlinux-128c8f96.xz
kernel image: https://storage.googleapis.com/syzbot-assets/aa690978a38e/bzImage-128c8f96.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3361c2d6f78a3e0892f9@...kaller.appspotmail.com

=====================================================
BUG: KMSAN: uninit-value in mii_nway_restart+0x119/0x1e0 drivers/net/mii.c:468
 mii_nway_restart+0x119/0x1e0 drivers/net/mii.c:468
 ch9200_bind+0x238/0xeb0 drivers/net/usb/ch9200.c:354
 usbnet_probe+0xdb0/0x3eb0 drivers/net/usb/usbnet.c:1761
 usb_probe_interface+0xd33/0x12e0 drivers/usb/core/driver.c:396
 really_probe+0x4dc/0xd90 drivers/base/dd.c:658
 __driver_probe_device+0x2ab/0x5d0 drivers/base/dd.c:800
 driver_probe_device+0x72/0x890 drivers/base/dd.c:830
 __device_attach_driver+0x568/0x9e0 drivers/base/dd.c:958
 bus_for_each_drv+0x403/0x620 drivers/base/bus.c:462
 __device_attach+0x3c1/0x650 drivers/base/dd.c:1030
 device_initial_probe+0x32/0x40 drivers/base/dd.c:1079
 bus_probe_device+0x3dc/0x5c0 drivers/base/bus.c:537
 device_add+0x13aa/0x1ba0 drivers/base/core.c:3665
 usb_set_configuration+0x31c9/0x38d0 drivers/usb/core/message.c:2210
 usb_generic_driver_probe+0x109/0x2a0 drivers/usb/core/generic.c:250
 usb_probe_device+0x3a7/0x690 drivers/usb/core/driver.c:291
 really_probe+0x4dc/0xd90 drivers/base/dd.c:658
 __driver_probe_device+0x2ab/0x5d0 drivers/base/dd.c:800
 driver_probe_device+0x72/0x890 drivers/base/dd.c:830
 __device_attach_driver+0x568/0x9e0 drivers/base/dd.c:958
 bus_for_each_drv+0x403/0x620 drivers/base/bus.c:462
 __device_attach+0x3c1/0x650 drivers/base/dd.c:1030
 device_initial_probe+0x32/0x40 drivers/base/dd.c:1079
 bus_probe_device+0x3dc/0x5c0 drivers/base/bus.c:537
 device_add+0x13aa/0x1ba0 drivers/base/core.c:3665
 usb_new_device+0x15f0/0x2470 drivers/usb/core/hub.c:2652
 hub_port_connect drivers/usb/core/hub.c:5523 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5663 [inline]
 port_event drivers/usb/core/hub.c:5823 [inline]
 hub_event+0x4ffb/0x72d0 drivers/usb/core/hub.c:5905
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xc1a/0x1e80 kernel/workqueue.c:3317
 worker_thread+0xea7/0x14f0 kernel/workqueue.c:3398
 kthread+0x6b9/0xef0 kernel/kthread.c:464
 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Local variable buff created at:
 ch9200_mdio_read+0x3c/0x100 drivers/net/usb/ch9200.c:180
 mii_nway_restart+0x8a/0x1e0 drivers/net/mii.c:466

CPU: 1 UID: 0 PID: 3067 Comm: kworker/1:2 Not tainted 6.14.0-rc2-syzkaller-00185-g128c8f96eb86 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Workqueue: usb_hub_wq hub_event
=====================================================


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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