linux-kernel - Re: [syzbot] [input?] [usb?] UBSAN: shift-out-of-bounds in s32ton (2)

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Message-ID: <6876b0ec.a70a0220.693ce.0019.GAE@google.com>
Date: Tue, 15 Jul 2025 12:50:04 -0700
From: syzbot <syzbot+b63d677d63bcac06cf90@...kaller.appspotmail.com>
To: bentiss@...nel.org, jikos@...nel.org, linux-input@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org, 
	stern@...land.harvard.edu, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [input?] [usb?] UBSAN: shift-out-of-bounds in s32ton (2)

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
UBSAN: shift-out-of-bounds in s32ton

microsoft 0003:045E:07DA.0001: ignoring exceeding usage max
microsoft 0003:045E:07DA.0001: unsupported Resolution Multiplier 0
hid: s32ton: n 0 val 0 size 0x0
------------[ cut here ]------------
UBSAN: shift-out-of-bounds in drivers/hid/hid-core.c:69:16
shift exponent 4294967295 is too large for 32-bit type '__s32' (aka 'int')
CPU: 0 UID: 0 PID: 5987 Comm: kworker/0:4 Not tainted 6.15.0-syzkaller-11339-gc2ca42f190b6-dirty #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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
 s32ton+0xde/0x140 drivers/hid/hid-core.c:69
 hid_output_field drivers/hid/hid-core.c:1845 [inline]
 hid_output_report+0x3a2/0x5c0 drivers/hid/hid-core.c:1877
 __hid_request+0x14a/0x420 drivers/hid/hid-core.c:2000
 hidinput_change_resolution_multipliers drivers/hid/hid-input.c:1950 [inline]
 hidinput_connect+0x218a/0x3030 drivers/hid/hid-input.c:2327
 hid_connect+0x499/0x1980 drivers/hid/hid-core.c:2251
 hid_hw_start+0xa8/0x120 drivers/hid/hid-core.c:2366
 ms_probe+0x180/0x430 drivers/hid/hid-microsoft.c:391
 __hid_device_probe drivers/hid/hid-core.c:2736 [inline]
 hid_device_probe+0x3a0/0x710 drivers/hid/hid-core.c:2773
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x26a/0x9a0 drivers/base/dd.c:657
 __driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:799
 driver_probe_device+0x4f/0x430 drivers/base/dd.c:829
 __device_attach_driver+0x2ce/0x530 drivers/base/dd.c:957
 bus_for_each_drv+0x251/0x2e0 drivers/base/bus.c:462
 __device_attach+0x2b8/0x400 drivers/base/dd.c:1029
 bus_probe_device+0x185/0x260 drivers/base/bus.c:537
 device_add+0x7b6/0xb50 drivers/base/core.c:3692
 hid_add_device+0x398/0x540 drivers/hid/hid-core.c:2919
 usbhid_probe+0xe13/0x12a0 drivers/hid/usbhid/hid-core.c:1435
 usb_probe_interface+0x644/0xbc0 drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x26a/0x9a0 drivers/base/dd.c:657
 __driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:799
 driver_probe_device+0x4f/0x430 drivers/base/dd.c:829
 __device_attach_driver+0x2ce/0x530 drivers/base/dd.c:957
 bus_for_each_drv+0x251/0x2e0 drivers/base/bus.c:462
 __device_attach+0x2b8/0x400 drivers/base/dd.c:1029
 bus_probe_device+0x185/0x260 drivers/base/bus.c:537
 device_add+0x7b6/0xb50 drivers/base/core.c:3692
 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+0x1c4/0x390 drivers/usb/core/driver.c:291
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x26a/0x9a0 drivers/base/dd.c:657
 __driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:799
 driver_probe_device+0x4f/0x430 drivers/base/dd.c:829
 __device_attach_driver+0x2ce/0x530 drivers/base/dd.c:957
 bus_for_each_drv+0x251/0x2e0 drivers/base/bus.c:462
 __device_attach+0x2b8/0x400 drivers/base/dd.c:1029
 bus_probe_device+0x185/0x260 drivers/base/bus.c:537
 device_add+0x7b6/0xb50 drivers/base/core.c:3692
 usb_new_device+0xa39/0x16c0 drivers/usb/core/hub.c:2663
 hub_port_connect drivers/usb/core/hub.c:5531 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5671 [inline]
 port_event drivers/usb/core/hub.c:5831 [inline]
 hub_event+0x2941/0x4a00 drivers/usb/core/hub.c:5913
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3321
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 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 ]---


Tested on:

commit:         c2ca42f1 HID: core: do not bypass hid_hw_raw_request
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid.git
console output: https://syzkaller.appspot.com/x/log.txt?x=152e098c580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=ec692dfd475747ff
dashboard link: https://syzkaller.appspot.com/bug?extid=b63d677d63bcac06cf90
compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
patch:          https://syzkaller.appspot.com/x/patch.diff?x=13b6098c580000