netdev - [syzbot] [net?] [usb?] KMSAN: uninit-value in rtl8150

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Message-ID: <68af933a.a00a0220.2929dc.0007.GAE@google.com>
Date: Wed, 27 Aug 2025 16:22:34 -0700
From: syzbot <syzbot+b4d5d8faea6996fd55e3@...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, petkan@...leusys.com, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [net?] [usb?] KMSAN: uninit-value in rtl8150_open

Hello,

syzbot found the following issue on:

HEAD commit:    fab1beda7597 Merge tag 'devicetree-fixes-for-6.17-1' of gi..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17a9e462580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=6ccfdce02093e91f
dashboard link: https://syzkaller.appspot.com/bug?extid=b4d5d8faea6996fd55e3
compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/db03ab9be061/disk-fab1beda.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/465314c75c15/vmlinux-fab1beda.xz
kernel image: https://storage.googleapis.com/syzbot-assets/02e5480b1de2/bzImage-fab1beda.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b4d5d8faea6996fd55e3@...kaller.appspotmail.com

usb 1-1: device reset failed
=====================================================
BUG: KMSAN: uninit-value in set_carrier drivers/net/usb/rtl8150.c:721 [inline]
BUG: KMSAN: uninit-value in rtl8150_open+0x1131/0x1360 drivers/net/usb/rtl8150.c:758
 set_carrier drivers/net/usb/rtl8150.c:721 [inline]
 rtl8150_open+0x1131/0x1360 drivers/net/usb/rtl8150.c:758
 __dev_open+0x7e9/0xc60 net/core/dev.c:1682
 __dev_change_flags+0x3a8/0x9f0 net/core/dev.c:9549
 netif_change_flags+0x8d/0x1e0 net/core/dev.c:9612
 dev_change_flags+0x18c/0x320 net/core/dev_api.c:68
 devinet_ioctl+0x1186/0x2500 net/ipv4/devinet.c:1200
 inet_ioctl+0x4c0/0x6f0 net/ipv4/af_inet.c:1001
 sock_do_ioctl+0x9c/0x480 net/socket.c:1238
 sock_ioctl+0x70b/0xd60 net/socket.c:1359
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:598 [inline]
 __se_sys_ioctl+0x23c/0x400 fs/ioctl.c:584
 __x64_sys_ioctl+0x97/0xe0 fs/ioctl.c:584
 x64_sys_call+0x1cbc/0x3e20 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Local variable tmp created at:
 number+0x8a/0x2200 lib/vsprintf.c:469
 vsnprintf+0xd21/0x1bd0 lib/vsprintf.c:2890

CPU: 1 UID: 0 PID: 5461 Comm: dhcpcd Not tainted syzkaller #0 PREEMPT(none) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
=====================================================


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.

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If the report is already addressed, let syzbot know by replying with:
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