[syzbot] [net?] [usb?] WARNING in mdiobus_get_phy

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 5ce74bc1b7cb Add linux-next specific files for 20251211
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=130b51c2580000
kernel config: https://syzkaller.appspot.com/x/.config?x=b9f785244b836412
dashboard link: https://syzkaller.appspot.com/bug?extid=3d43c9066a5b54902232
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13baa61a580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/e550c10060d5/disk-5ce74bc1.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/80331ba2b4cc/vmlinux-5ce74bc1.xz
kernel image: https://storage.googleapis.com/syzbot-assets/4bcb4f82dfcf/bzImage-5ce74bc1.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3d43c9...@syzkaller.appspotmail.com

------------[ cut here ]------------
addr 207 out of range
WARNING: drivers/net/phy/mdio_bus.c:76 at mdiobus_find_device drivers/net/phy/mdio_bus.c:76 [inline], CPU#0: kworker/0:5/6044
WARNING: drivers/net/phy/mdio_bus.c:76 at mdiobus_get_phy+0xaf/0xd0 drivers/net/phy/mdio_bus.c:86, CPU#0: kworker/0:5/6044
Modules linked in:
CPU: 0 UID: 0 PID: 6044 Comm: kworker/0:5 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: usb_hub_wq hub_event
RIP: 0010:mdiobus_find_device drivers/net/phy/mdio_bus.c:76 [inline]
RIP: 0010:mdiobus_get_phy+0xb1/0xd0 drivers/net/phy/mdio_bus.c:86
Code: e8 34 1c 73 fb eb 07 e8 ed 17 73 fb 31 db 48 89 d8 5b 41 5e 41 5f c3 cc cc cc cc cc e8 d8 17 73 fb 48 8d 3d 31 16 81 09 89 de <67> 48 0f b9 3a eb db 89 f9 80 e1 07 80 c1 03 38 c1 7c b1 e8 57 7a
RSP: 0018:ffffc900033a6aa8 EFLAGS: 00010293
RAX: ffffffff864edf78 RBX: 00000000000000cf RCX: ffff88802a9ebd00
RDX: 0000000000000000 RSI: 00000000000000cf RDI: ffffffff8fcff5b0
RBP: ffffc900033a6bf0 R08: ffffc900033a6787 R09: 1ffff92000674cf0
R10: dffffc0000000000 R11: fffff52000674cf1 R12: ffff888078e2cdc0
R13: dffffc0000000000 R14: ffff88807cd12000 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8881259e6000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1c669c9e9c CR3: 000000000e13a000 CR4: 00000000003526f0
Call Trace:
<TASK>
ax88772_init_phy+0x8e/0x390 drivers/net/usb/asix_devices.c:722
ax88772_bind+0x961/0xde0 drivers/net/usb/asix_devices.c:937
usbnet_probe+0xab5/0x28f0 drivers/net/usb/usbnet.c:1802
usb_probe_interface+0x668/0xc90 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x26d/0xad0 drivers/base/dd.c:659
__driver_probe_device+0x18c/0x320 drivers/base/dd.c:801
driver_probe_device+0x4f/0x240 drivers/base/dd.c:831
__device_attach_driver+0x279/0x430 drivers/base/dd.c:959
bus_for_each_drv+0x251/0x2e0 drivers/base/bus.c:500
__device_attach+0x2b8/0x430 drivers/base/dd.c:1031
device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1086
bus_probe_device+0x12a/0x220 drivers/base/bus.c:574
device_add+0x7b6/0xb80 drivers/base/core.c:3689
usb_set_configuration+0x1a87/0x2110 drivers/usb/core/message.c:2210
usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250
usb_probe_device+0x1c4/0x3c0 drivers/usb/core/driver.c:291
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x26d/0xad0 drivers/base/dd.c:659
__driver_probe_device+0x18c/0x320 drivers/base/dd.c:801
driver_probe_device+0x4f/0x240 drivers/base/dd.c:831
__device_attach_driver+0x279/0x430 drivers/base/dd.c:959
bus_for_each_drv+0x251/0x2e0 drivers/base/bus.c:500
__device_attach+0x2b8/0x430 drivers/base/dd.c:1031
device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1086
bus_probe_device+0x12a/0x220 drivers/base/bus.c:574
device_add+0x7b6/0xb80 drivers/base/core.c:3689
usb_new_device+0xa39/0x1720 drivers/usb/core/hub.c:2695
hub_port_connect drivers/usb/core/hub.c:5567 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
port_event drivers/usb/core/hub.c:5871 [inline]
hub_event+0x29b1/0x4ef0 drivers/usb/core/hub.c:5953
process_one_work+0x93a/0x15a0 kernel/workqueue.c:3279
process_scheduled_works kernel/workqueue.c:3362 [inline]
worker_thread+0x9b0/0xee0 kernel/workqueue.c:3443
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
</TASK>
----------------
Code disassembly (best guess):
0: e8 34 1c 73 fb call 0xfb731c39
5: eb 07 jmp 0xe
7: e8 ed 17 73 fb call 0xfb7317f9
c: 31 db xor %ebx,%ebx
e: 48 89 d8 mov %rbx,%rax
11: 5b pop %rbx
12: 41 5e pop %r14
14: 41 5f pop %r15
16: c3 ret
17: cc int3
18: cc int3
19: cc int3
1a: cc int3
1b: cc int3
1c: e8 d8 17 73 fb call 0xfb7317f9
21: 48 8d 3d 31 16 81 09 lea 0x9811631(%rip),%rdi # 0x9811659
28: 89 de mov %ebx,%esi
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: eb db jmp 0xc
31: 89 f9 mov %edi,%ecx
33: 80 e1 07 and $0x7,%cl
36: 80 c1 03 add $0x3,%cl
39: 38 c1 cmp %al,%cl
3b: 7c b1 jl 0xffffffee
3d: e8 .byte 0xe8
3e: 57 push %rdi
3f: 7a .byte 0x7a


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