* [syzbot] [usb?] [net?] KMSAN: uninit-value in rtl8150_open (2)
@ 2026-03-25 2:40 syzbot
2026-03-25 9:12 ` Kohei Enju
0 siblings, 1 reply; 3+ messages in thread
From: syzbot @ 2026-03-25 2:40 UTC (permalink / raw)
To: andrew+netdev, davem, edumazet, kuba, linux-kernel, linux-usb,
netdev, pabeni, petkan, syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: c612261bedd6 Merge tag 'io_uring-7.0-20260320' of git://gi..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=155801d6580000
kernel config: https://syzkaller.appspot.com/x/.config?x=963de479f54c6dbb
dashboard link: https://syzkaller.appspot.com/bug?extid=9db6c624635564ad813c
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/aa2bdf537bf6/disk-c612261b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/8fcd98072431/vmlinux-c612261b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/737b94c52155/bzImage-c612261b.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9db6c624635564ad813c@syzkaller.appspotmail.com
usb 2-1: device reset failed
=====================================================
BUG: KMSAN: uninit-value in set_carrier drivers/net/usb/rtl8150.c:726 [inline]
BUG: KMSAN: uninit-value in rtl8150_open+0x1131/0x1360 drivers/net/usb/rtl8150.c:763
set_carrier drivers/net/usb/rtl8150.c:726 [inline]
rtl8150_open+0x1131/0x1360 drivers/net/usb/rtl8150.c:763
__dev_open+0x8e3/0xd40 net/core/dev.c:1702
__dev_change_flags+0x32f/0x950 net/core/dev.c:9764
netif_change_flags+0x8d/0x1e0 net/core/dev.c:9827
dev_change_flags+0x18c/0x320 net/core/dev_api.c:68
devinet_ioctl+0x10dd/0x25a0 net/ipv4/devinet.c:1199
inet_ioctl+0x4c0/0x6f0 net/ipv4/af_inet.c:1015
sock_do_ioctl net/socket.c:1254 [inline]
sock_ioctl+0x769/0x1140 net/socket.c:1375
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0x23c/0x400 fs/ioctl.c:583
__x64_sys_ioctl+0x97/0xe0 fs/ioctl.c:583
x64_sys_call+0x1975/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:17
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x134/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Local variable tmp.i created at:
set_carrier drivers/net/usb/rtl8150.c:723 [inline]
rtl8150_open+0xc26/0x1360 drivers/net/usb/rtl8150.c:763
__dev_open+0x8e3/0xd40 net/core/dev.c:1702
CPU: 1 UID: 0 PID: 5428 Comm: dhcpcd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
=====================================================
---
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@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [syzbot] [usb?] [net?] KMSAN: uninit-value in rtl8150_open (2)
2026-03-25 2:40 [syzbot] [usb?] [net?] KMSAN: uninit-value in rtl8150_open (2) syzbot
@ 2026-03-25 9:12 ` Kohei Enju
2026-03-26 0:33 ` Kuniyuki Iwashima
0 siblings, 1 reply; 3+ messages in thread
From: Kohei Enju @ 2026-03-25 9:12 UTC (permalink / raw)
To: syzbot+9db6c624635564ad813c
Cc: kuniyu, andrew+netdev, linux-kernel, linux-usb, netdev,
syzkaller-bugs
+ Iwashima-san
On Tue, 24 Mar 2026 19:40:28 -0700, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: c612261bedd6 Merge tag 'io_uring-7.0-20260320' of git://gi..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=155801d6580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=963de479f54c6dbb
> dashboard link: https://syzkaller.appspot.com/bug?extid=9db6c624635564ad813c
> compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
>
> Unfortunately, I don't have any reproducer for this issue yet.
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/aa2bdf537bf6/disk-c612261b.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/8fcd98072431/vmlinux-c612261b.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/737b94c52155/bzImage-c612261b.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+9db6c624635564ad813c@syzkaller.appspotmail.com
>
> usb 2-1: device reset failed
> =====================================================
> BUG: KMSAN: uninit-value in set_carrier drivers/net/usb/rtl8150.c:726 [inline]
> BUG: KMSAN: uninit-value in rtl8150_open+0x1131/0x1360 drivers/net/usb/rtl8150.c:763
> set_carrier drivers/net/usb/rtl8150.c:726 [inline]
> rtl8150_open+0x1131/0x1360 drivers/net/usb/rtl8150.c:763
> __dev_open+0x8e3/0xd40 net/core/dev.c:1702
> __dev_change_flags+0x32f/0x950 net/core/dev.c:9764
> netif_change_flags+0x8d/0x1e0 net/core/dev.c:9827
> dev_change_flags+0x18c/0x320 net/core/dev_api.c:68
> devinet_ioctl+0x10dd/0x25a0 net/ipv4/devinet.c:1199
> inet_ioctl+0x4c0/0x6f0 net/ipv4/af_inet.c:1015
> sock_do_ioctl net/socket.c:1254 [inline]
> sock_ioctl+0x769/0x1140 net/socket.c:1375
> vfs_ioctl fs/ioctl.c:51 [inline]
> __do_sys_ioctl fs/ioctl.c:597 [inline]
> __se_sys_ioctl+0x23c/0x400 fs/ioctl.c:583
> __x64_sys_ioctl+0x97/0xe0 fs/ioctl.c:583
> x64_sys_call+0x1975/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:17
> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
> do_syscall_64+0x134/0xf80 arch/x86/entry/syscall_64.c:94
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
>
> Local variable tmp.i created at:
> set_carrier drivers/net/usb/rtl8150.c:723 [inline]
> rtl8150_open+0xc26/0x1360 drivers/net/usb/rtl8150.c:763
> __dev_open+0x8e3/0xd40 net/core/dev.c:1702
I see Iwashima-san was previously working on this issue here:
https://lore.kernel.org/all/20250827233108.3768855-1-kuniyu@google.com/T/
The issue seems to be that set_carrier() ignores the return value of
get_registers() and may use an uninitialized tmp.
rtl8150 appears to have other call sites that use get_registers() the
same way as mentioned in the thread above.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [syzbot] [usb?] [net?] KMSAN: uninit-value in rtl8150_open (2)
2026-03-25 9:12 ` Kohei Enju
@ 2026-03-26 0:33 ` Kuniyuki Iwashima
0 siblings, 0 replies; 3+ messages in thread
From: Kuniyuki Iwashima @ 2026-03-26 0:33 UTC (permalink / raw)
To: Kohei Enju
Cc: syzbot+9db6c624635564ad813c, andrew+netdev, linux-kernel,
linux-usb, netdev, syzkaller-bugs
On Wed, Mar 25, 2026 at 2:12 AM Kohei Enju <kohei@enjuk.jp> wrote:
>
> + Iwashima-san
>
> On Tue, 24 Mar 2026 19:40:28 -0700, syzbot wrote:
> > Hello,
> >
> > syzbot found the following issue on:
> >
> > HEAD commit: c612261bedd6 Merge tag 'io_uring-7.0-20260320' of git://gi..
> > git tree: upstream
> > console output: https://syzkaller.appspot.com/x/log.txt?x=155801d6580000
> > kernel config: https://syzkaller.appspot.com/x/.config?x=963de479f54c6dbb
> > dashboard link: https://syzkaller.appspot.com/bug?extid=9db6c624635564ad813c
> > compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
> >
> > Unfortunately, I don't have any reproducer for this issue yet.
> >
> > Downloadable assets:
> > disk image: https://storage.googleapis.com/syzbot-assets/aa2bdf537bf6/disk-c612261b.raw.xz
> > vmlinux: https://storage.googleapis.com/syzbot-assets/8fcd98072431/vmlinux-c612261b.xz
> > kernel image: https://storage.googleapis.com/syzbot-assets/737b94c52155/bzImage-c612261b.xz
> >
> > IMPORTANT: if you fix the issue, please add the following tag to the commit:
> > Reported-by: syzbot+9db6c624635564ad813c@syzkaller.appspotmail.com
> >
> > usb 2-1: device reset failed
> > =====================================================
> > BUG: KMSAN: uninit-value in set_carrier drivers/net/usb/rtl8150.c:726 [inline]
> > BUG: KMSAN: uninit-value in rtl8150_open+0x1131/0x1360 drivers/net/usb/rtl8150.c:763
> > set_carrier drivers/net/usb/rtl8150.c:726 [inline]
> > rtl8150_open+0x1131/0x1360 drivers/net/usb/rtl8150.c:763
> > __dev_open+0x8e3/0xd40 net/core/dev.c:1702
> > __dev_change_flags+0x32f/0x950 net/core/dev.c:9764
> > netif_change_flags+0x8d/0x1e0 net/core/dev.c:9827
> > dev_change_flags+0x18c/0x320 net/core/dev_api.c:68
> > devinet_ioctl+0x10dd/0x25a0 net/ipv4/devinet.c:1199
> > inet_ioctl+0x4c0/0x6f0 net/ipv4/af_inet.c:1015
> > sock_do_ioctl net/socket.c:1254 [inline]
> > sock_ioctl+0x769/0x1140 net/socket.c:1375
> > vfs_ioctl fs/ioctl.c:51 [inline]
> > __do_sys_ioctl fs/ioctl.c:597 [inline]
> > __se_sys_ioctl+0x23c/0x400 fs/ioctl.c:583
> > __x64_sys_ioctl+0x97/0xe0 fs/ioctl.c:583
> > x64_sys_call+0x1975/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:17
> > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
> > do_syscall_64+0x134/0xf80 arch/x86/entry/syscall_64.c:94
> > entry_SYSCALL_64_after_hwframe+0x77/0x7f
> >
> > Local variable tmp.i created at:
> > set_carrier drivers/net/usb/rtl8150.c:723 [inline]
> > rtl8150_open+0xc26/0x1360 drivers/net/usb/rtl8150.c:763
> > __dev_open+0x8e3/0xd40 net/core/dev.c:1702
>
> I see Iwashima-san was previously working on this issue here:
> https://lore.kernel.org/all/20250827233108.3768855-1-kuniyu@google.com/T/
>
> The issue seems to be that set_carrier() ignores the return value of
> get_registers() and may use an uninitialized tmp.
>
> rtl8150 appears to have other call sites that use get_registers() the
> same way as mentioned in the thread above.
Right, feel free to take my patch over ;)
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2026-03-26 0:33 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2026-03-25 2:40 [syzbot] [usb?] [net?] KMSAN: uninit-value in rtl8150_open (2) syzbot
2026-03-25 9:12 ` Kohei Enju
2026-03-26 0:33 ` Kuniyuki Iwashima
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox