linux-kernel - Re: [syzbot] [usb?] UBSAN: shift-out-of-bounds in ax88772

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Message-ID: <68a208d0.050a0220.e29e5.006e.GAE@google.com>
Date: Sun, 17 Aug 2025 09:52:32 -0700
From: syzbot <syzbot+20537064367a0f98d597@...kaller.appspotmail.com>
To: andrew+netdev@...n.ch, andrew@...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: Re: [syzbot] [usb?] UBSAN: shift-out-of-bounds in ax88772_bind

syzbot has found a reproducer for the following issue on:

HEAD commit:    99bade344cfa Merge tag 'rust-fixes-6.17' of git://git.kern..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=13ea1234580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=ce98061fb8ee27bc
dashboard link: https://syzkaller.appspot.com/bug?extid=20537064367a0f98d597
compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=126d13a2580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1754faf0580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/e140d0491611/disk-99bade34.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f581d5a99c83/vmlinux-99bade34.xz
kernel image: https://storage.googleapis.com/syzbot-assets/feceb1caceef/bzImage-99bade34.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+20537064367a0f98d597@...kaller.appspotmail.com

------------[ cut here ]------------
UBSAN: shift-out-of-bounds in drivers/net/usb/asix_devices.c:679:27
shift exponent 208 is too large for 64-bit type 'unsigned long'
CPU: 0 UID: 0 PID: 10 Comm: kworker/0:1 Not tainted 6.17.0-rc1-syzkaller-00214-g99bade344cfa #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: usb_hub_wq hub_event
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 ubsan_epilogue+0xa/0x40 lib/ubsan.c:233
 __ubsan_handle_shift_out_of_bounds+0x386/0x410 lib/ubsan.c:494
 ax88772_init_mdio drivers/net/usb/asix_devices.c:679 [inline]
 ax88772_bind+0xdcf/0xfa0 drivers/net/usb/asix_devices.c:910
 usbnet_probe+0xa96/0x2870 drivers/net/usb/usbnet.c:1781
 usb_probe_interface+0x668/0xc30 drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x26a/0x9e0 drivers/base/dd.c:659
 __driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:801
 driver_probe_device+0x4f/0x430 drivers/base/dd.c:831
 __device_attach_driver+0x2ce/0x530 drivers/base/dd.c:959
 bus_for_each_drv+0x251/0x2e0 drivers/base/bus.c:462
 __device_attach+0x2b8/0x400 drivers/base/dd.c:1031
 bus_probe_device+0x185/0x260 drivers/base/bus.c:537
 device_add+0x7b6/0xb50 drivers/base/core.c:3689
 usb_set_configuration+0x1a87/0x20e0 drivers/usb/core/message.c:2210
 usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250
 usb_probe_device+0x1c1/0x390 drivers/usb/core/driver.c:291
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x26a/0x9e0 drivers/base/dd.c:659
 __driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:801
 driver_probe_device+0x4f/0x430 drivers/base/dd.c:831
 __device_attach_driver+0x2ce/0x530 drivers/base/dd.c:959
 bus_for_each_drv+0x251/0x2e0 drivers/base/bus.c:462
 __device_attach+0x2b8/0x400 drivers/base/dd.c:1031
 bus_probe_device+0x185/0x260 drivers/base/bus.c:537
 device_add+0x7b6/0xb50 drivers/base/core.c:3689
 usb_new_device+0xa39/0x16f0 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:5870 [inline]
 hub_event+0x2958/0x4a20 drivers/usb/core/hub.c:5952
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
---[ end trace ]---


---
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#syz test: git://repo/address.git branch-or-commit-hash
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