[syzbot] [usb?] WARNING in usbnet_status_start

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: d1b07cc0868f arm64: dts: s32g: Add USB device tree informa..
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
console output: https://syzkaller.appspot.com/x/log.txt?x=1554d582580000
kernel config: https://syzkaller.appspot.com/x/.config?x=28729dff5d03ad1
dashboard link: https://syzkaller.appspot.com/bug?extid=3f89ec3d1d0842e95d50
compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11680a8c580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14c9abd4580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/3eab0cb43ae2/disk-d1b07cc0.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/934d59614ed5/vmlinux-d1b07cc0.xz
kernel image: https://storage.googleapis.com/syzbot-assets/4b24078bc227/bzImage-d1b07cc0.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3f89ec...@syzkaller.appspotmail.com

sierra_net 4-1:0.11 wwan0: register 'sierra_net' at usb-dummy_hcd.3-1, Sierra Wireless USB-to-WWAN Modem, 00:00:00:00:01:0b
------------[ cut here ]------------
WARNING: CPU: 1 PID: 37 at drivers/net/usb/usbnet.c:266 usbnet_status_start+0x189/0x1e0 drivers/net/usb/usbnet.c:266
Modules linked in:
CPU: 1 UID: 0 PID: 37 Comm: kworker/1:1 Not tainted 6.16.0-rc4-syzkaller-00311-gd1b07cc0868f #0 PREEMPT(voluntary)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: usb_hub_wq hub_event
RIP: 0010:usbnet_status_start+0x189/0x1e0 drivers/net/usb/usbnet.c:266
Code: 00 fc ff df 48 c1 ea 03 80 3c 02 00 75 4e 48 8b bb 70 03 00 00 89 ee e8 25 95 0c 00 41 89 c5 e9 36 ff ff ff e8 a8 3f ec fc 90 <0f> 0b 90 45 31 ed e9 39 ff ff ff 4c 89 ff e8 d4 41 49 fd e9 e9 fe
RSP: 0018:ffffc90000277098 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888100f80d00 RCX: ffffffff84930727
RDX: ffff888105693a00 RSI: ffffffff84919188 RDI: ffff888100f80d00
RBP: 0000000000000cc0 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff888100f81070
R13: ffffffff89be8f70 R14: ffff88811da1f028 R15: ffff88811da1f024
FS: 0000000000000000(0000) GS:ffff888269262000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd6ab63358 CR3: 0000000116716000 CR4: 00000000003506f0
Call Trace:
<TASK>
sierra_net_probe drivers/net/usb/sierra_net.c:929 [inline]
sierra_net_probe+0x70/0xb0 drivers/net/usb/sierra_net.c:921
usb_probe_interface+0x303/0x9c0 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:579 [inline]
really_probe+0x23e/0xa90 drivers/base/dd.c:657
__driver_probe_device+0x1de/0x440 drivers/base/dd.c:799
driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:829
__device_attach_driver+0x1df/0x310 drivers/base/dd.c:957
bus_for_each_drv+0x156/0x1e0 drivers/base/bus.c:462
__device_attach+0x1e4/0x4b0 drivers/base/dd.c:1029
bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:537
device_add+0x1148/0x1a70 drivers/base/core.c:3692
usb_set_configuration+0x1187/0x1e20 drivers/usb/core/message.c:2210
usb_generic_driver_probe+0xb1/0x110 drivers/usb/core/generic.c:250
usb_probe_device+0xef/0x3e0 drivers/usb/core/driver.c:291
call_driver_probe drivers/base/dd.c:579 [inline]
really_probe+0x23e/0xa90 drivers/base/dd.c:657
__driver_probe_device+0x1de/0x440 drivers/base/dd.c:799
driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:829
__device_attach_driver+0x1df/0x310 drivers/base/dd.c:957
bus_for_each_drv+0x156/0x1e0 drivers/base/bus.c:462
__device_attach+0x1e4/0x4b0 drivers/base/dd.c:1029
bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:537
device_add+0x1148/0x1a70 drivers/base/core.c:3692
usb_new_device+0xd07/0x1a20 drivers/usb/core/hub.c:2694
hub_port_connect drivers/usb/core/hub.c:5566 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5706 [inline]
port_event drivers/usb/core/hub.c:5866 [inline]
hub_event+0x2f85/0x5030 drivers/usb/core/hub.c:5948
process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3321 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x5b3/0x6c0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>


---
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 syzk...@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 syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

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

[Hillf Danton]

> Date: Tue, 08 Jul 2025 10:51:27 -0700

> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: d1b07cc0868f arm64: dts: s32g: Add USB device tree informa..
> git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
> console output: https://syzkaller.appspot.com/x/log.txt?x=1554d582580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=28729dff5d03ad1
> dashboard link: https://syzkaller.appspot.com/bug?extid=3f89ec3d1d0842e95d50
> compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11680a8c580000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14c9abd4580000

#syz test

--- x/drivers/net/usb/usbnet.c
+++ y/drivers/net/usb/usbnet.c
@@ -254,6 +254,8 @@ static int init_status (struct usbnet *d
"status ep%din, %d bytes period %d\n",
usb_pipeendpoint(pipe), maxp, period);
}
+ } else {
+ return -ENOMEM;
}
return 0;
}
--

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in usbnet_status_start

sierra_net 4-1:0.11 wwan0: register 'sierra_net' at usb-dummy_hcd.3-1, Sierra Wireless USB-to-WWAN Modem, 00:00:00:00:01:0b
------------[ cut here ]------------

WARNING: CPU: 1 PID: 37 at drivers/net/usb/usbnet.c:268 usbnet_status_start+0x189/0x1e0 drivers/net/usb/usbnet.c:268
Modules linked in:
CPU: 1 UID: 0 PID: 37 Comm: kworker/1:1 Not tainted 6.16.0-rc4-syzkaller-00311-gd1b07cc0868f-dirty #0 PREEMPT(voluntary)

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: usb_hub_wq hub_event

RIP: 0010:usbnet_status_start+0x189/0x1e0 drivers/net/usb/usbnet.c:268

Code: 00 fc ff df 48 c1 ea 03 80 3c 02 00 75 4e 48 8b bb 70 03 00 00 89 ee e8 25 95 0c 00 41 89 c5 e9 36 ff ff ff e8 a8 3f ec fc 90 <0f> 0b 90 45 31 ed e9 39 ff ff ff 4c 89 ff e8 d4 41 49 fd e9 e9 fe
RSP: 0018:ffffc90000277098 EFLAGS: 00010293

RAX: 0000000000000000 RBX: ffff888107f64d00 RCX: ffffffff84930727
RDX: ffff888105693a00 RSI: ffffffff84919188 RDI: ffff888107f64d00

RBP: 0000000000000cc0 R08: 0000000000000005 R09: 0000000000000000

R10: 0000000000000000 R11: 0000000000000001 R12: ffff888107f65070
R13: ffffffff89be8f70 R14: ffff888116be6028 R15: ffff888116be6024

FS: 0000000000000000(0000) GS:ffff888269262000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00007f6e767f1d60 CR3: 000000011f9fc000 CR4: 00000000003506f0

Tested on:

commit: d1b07cc0 arm64: dts: s32g: Add USB device tree informa..

git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing

console output: https://syzkaller.appspot.com/x/log.txt?x=10ea6bd4580000

kernel config: https://syzkaller.appspot.com/x/.config?x=28729dff5d03ad1
dashboard link: https://syzkaller.appspot.com/bug?extid=3f89ec3d1d0842e95d50
compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

patch: https://syzkaller.appspot.com/x/patch.diff?x=17cc8a8c580000

[Hillf Danton]

> Date: Tue, 08 Jul 2025 10:51:27 -0700

> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: d1b07cc0868f arm64: dts: s32g: Add USB device tree informa..
> git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
> console output: https://syzkaller.appspot.com/x/log.txt?x=1554d582580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=28729dff5d03ad1
> dashboard link: https://syzkaller.appspot.com/bug?extid=3f89ec3d1d0842e95d50
> compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11680a8c580000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14c9abd4580000

#syz test

--- x/drivers/net/usb/usbnet.c
+++ y/drivers/net/usb/usbnet.c
@@ -254,6 +254,8 @@ static int init_status (struct usbnet *d
"status ep%din, %d bytes period %d\n",
usb_pipeendpoint(pipe), maxp, period);
}
+ } else {
+ return -ENOMEM;
}
return 0;
}

@@ -1812,7 +1814,7 @@ usbnet_probe (struct usb_interface *udev
if (status == 0 && !usb_check_bulk_endpoints(udev, ep_addrs))
status = -EINVAL;
}
- if (status >= 0 && dev->status)
+ if (status >= 0)
status = init_status (dev, udev);
if (status < 0)
goto out3;
--

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:

general protection fault in usbnet_probe

Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 UID: 0 PID: 1117 Comm: kworker/1:2 Not tainted 6.16.0-rc4-syzkaller-00311-gd1b07cc0868f-dirty #0 PREEMPT(voluntary)

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: usb_hub_wq hub_event

RIP: 0010:init_status drivers/net/usb/usbnet.c:234 [inline]
RIP: 0010:usbnet_probe+0xf4e/0x2810 drivers/net/usb/usbnet.c:1818
Code: 48 c1 ea 03 80 3c 02 00 0f 85 a2 15 00 00 49 8b 87 20 0e 00 00 48 ba 00 00 00 00 00 fc ff df 48 8d 78 02 48 89 f9 48 c1 e9 03 <0f> b6 14 11 48 89 f9 83 e1 07 38 ca 7f 08 84 d2 0f 85 f4 11 00 00
RSP: 0018:ffffc90001c2efa8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888114c4b000 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffffff8491bef0 RDI: 0000000000000002
RBP: ffffffff87c293e0 R08: 0000000000000004 R09: 00000000000005dc
R10: 00000000000005dc R11: 0000000000000001 R12: ffffffff8492f590
R13: ffff888114c4a000 R14: ffff888107be40b4 R15: ffff888107be4000

FS: 0000000000000000(0000) GS:ffff888269262000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 0000001b3205ffff CR3: 000000011fb4c000 CR4: 00000000003506f0
Call Trace:
<TASK>
sierra_net_probe+0x1c/0xb0 drivers/net/usb/sierra_net.c:925

Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:init_status drivers/net/usb/usbnet.c:234 [inline]
RIP: 0010:usbnet_probe+0xf4e/0x2810 drivers/net/usb/usbnet.c:1818
Code: 48 c1 ea 03 80 3c 02 00 0f 85 a2 15 00 00 49 8b 87 20 0e 00 00 48 ba 00 00 00 00 00 fc ff df 48 8d 78 02 48 89 f9 48 c1 e9 03 <0f> b6 14 11 48 89 f9 83 e1 07 38 ca 7f 08 84 d2 0f 85 f4 11 00 00
RSP: 0018:ffffc90001c2efa8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888114c4b000 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffffff8491bef0 RDI: 0000000000000002
RBP: ffffffff87c293e0 R08: 0000000000000004 R09: 00000000000005dc
R10: 00000000000005dc R11: 0000000000000001 R12: ffffffff8492f590
R13: ffff888114c4a000 R14: ffff888107be40b4 R15: ffff888107be4000

FS: 0000000000000000(0000) GS:ffff888269262000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 0000001b3205ffff CR3: 0000000008ea4000 CR4: 00000000003506f0
----------------
Code disassembly (best guess):
0: 48 c1 ea 03 shr $0x3,%rdx
4: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
8: 0f 85 a2 15 00 00 jne 0x15b0
e: 49 8b 87 20 0e 00 00 mov 0xe20(%r15),%rax
15: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx
1c: fc ff df
1f: 48 8d 78 02 lea 0x2(%rax),%rdi
23: 48 89 f9 mov %rdi,%rcx
26: 48 c1 e9 03 shr $0x3,%rcx
* 2a: 0f b6 14 11 movzbl (%rcx,%rdx,1),%edx <-- trapping instruction
2e: 48 89 f9 mov %rdi,%rcx
31: 83 e1 07 and $0x7,%ecx
34: 38 ca cmp %cl,%dl
36: 7f 08 jg 0x40
38: 84 d2 test %dl,%dl
3a: 0f 85 f4 11 00 00 jne 0x1234


Tested on:

commit: d1b07cc0 arm64: dts: s32g: Add USB device tree informa..

git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing

console output: https://syzkaller.appspot.com/x/log.txt?x=101c3582580000

kernel config: https://syzkaller.appspot.com/x/.config?x=28729dff5d03ad1
dashboard link: https://syzkaller.appspot.com/bug?extid=3f89ec3d1d0842e95d50
compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

patch: https://syzkaller.appspot.com/x/patch.diff?x=141bca8c580000

[Hillf Danton]

> Date: Tue, 08 Jul 2025 10:51:27 -0700

> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: d1b07cc0868f arm64: dts: s32g: Add USB device tree informa..
> git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
> console output: https://syzkaller.appspot.com/x/log.txt?x=1554d582580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=28729dff5d03ad1
> dashboard link: https://syzkaller.appspot.com/bug?extid=3f89ec3d1d0842e95d50
> compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11680a8c580000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14c9abd4580000

#syz test

--- x/drivers/net/usb/usbnet.c
+++ y/drivers/net/usb/usbnet.c

@@ -231,6 +231,8 @@ static int init_status (struct usbnet *d
if (!dev->driver_info->status)
return 0;

+ if (!dev->status)
+ return -EINVAL;
pipe = usb_rcvintpipe (dev->udev,
dev->status->desc.bEndpointAddress
& USB_ENDPOINT_NUMBER_MASK);
@@ -254,6 +256,8 @@ static int init_status (struct usbnet *d

"status ep%din, %d bytes period %d\n",
usb_pipeendpoint(pipe), maxp, period);
}
+ } else {
+ return -ENOMEM;
}
return 0;
}

@@ -1812,7 +1816,7 @@ usbnet_probe (struct usb_interface *udev

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+3f89ec...@syzkaller.appspotmail.com
Tested-by: syzbot+3f89ec...@syzkaller.appspotmail.com

Tested on:

commit: d1b07cc0 arm64: dts: s32g: Add USB device tree informa..

git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing

console output: https://syzkaller.appspot.com/x/log.txt?x=12c38a8c580000

kernel config: https://syzkaller.appspot.com/x/.config?x=28729dff5d03ad1
dashboard link: https://syzkaller.appspot.com/bug?extid=3f89ec3d1d0842e95d50
compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

patch: https://syzkaller.appspot.com/x/patch.diff?x=104d8a8c580000

Note: testing is done by a robot and is best-effort only.

[Oliver Neukum]

> Seehttps://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached atsyz...@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 syzbot to run the reproducer, reply with:
> #syz test: git://repo/address.git branch-or-commit-hash

#syz test: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git d1b07cc0868f

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+3f89ec...@syzkaller.appspotmail.com
Tested-by: syzbot+3f89ec...@syzkaller.appspotmail.com

Tested on:

commit: d1b07cc0 arm64: dts: s32g: Add USB device tree informa..
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
console output: https://syzkaller.appspot.com/x/log.txt?x=16f83a8c580000

kernel config: https://syzkaller.appspot.com/x/.config?x=28729dff5d03ad1
dashboard link: https://syzkaller.appspot.com/bug?extid=3f89ec3d1d0842e95d50
compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

patch: https://syzkaller.appspot.com/x/patch.diff?x=164bda8c580000