Message-ID: <68695144.a00a0220.c7b3.0045.GAE@google.com>
Date: Sat, 05 Jul 2025 09:22:28 -0700
From: syzbot <syzbot+27fe438b6370f95de4a5@...kaller.appspotmail.com>
To: gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org, 
	linux-usb@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [usb?] KMSAN: kernel-usb-infoleak-after-free in usb_start_wait_urb

Hello,

syzbot found the following issue on:

HEAD commit:    66701750d556 Merge tag 'io_uring-6.16-20250630' of git://g..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=134693d4580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1d5c61bcebaf295a
dashboard link: https://syzkaller.appspot.com/bug?extid=27fe438b6370f95de4a5
compiler:       Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
userspace arch: i386

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/e203ce735cca/disk-66701750.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/e4f6e611c287/vmlinux-66701750.xz
kernel image: https://storage.googleapis.com/syzbot-assets/1b9c4100ce6f/bzImage-66701750.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+27fe438b6370f95de4a5@...kaller.appspotmail.com

usb 7-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 7-1: config 0 descriptor??
microsoft 0003:045E:07DA.003F: unknown main item tag 0x0
microsoft 0003:045E:07DA.003F: ignoring exceeding usage max
=====================================================
BUG: KMSAN: kernel-usb-infoleak-after-free in usb_submit_urb+0x5a1/0x2630 drivers/usb/core/urb.c:430
 usb_submit_urb+0x5a1/0x2630 drivers/usb/core/urb.c:430
 usb_start_wait_urb+0xc2/0x320 drivers/usb/core/message.c:59
 usb_internal_control_msg drivers/usb/core/message.c:103 [inline]
 usb_control_msg+0x27c/0x5b0 drivers/usb/core/message.c:154
 usbhid_raw_request+0x4ab/0x690 drivers/hid/usbhid/hid-core.c:-1
 __hid_request+0x2bd/0x500 drivers/hid/hid-core.c:1989
 hidinput_change_resolution_multipliers drivers/hid/hid-input.c:1950 [inline]
 hidinput_connect+0x3bf5/0x5cc0 drivers/hid/hid-input.c:2327
 hid_connect+0x6b4/0x3440 drivers/hid/hid-core.c:2239
 hid_hw_start+0xfc/0x1e0 drivers/hid/hid-core.c:2354
 ms_probe+0x2e5/0x890 drivers/hid/hid-microsoft.c:391
 __hid_device_probe drivers/hid/hid-core.c:2724 [inline]
 hid_device_probe+0x536/0xab0 drivers/hid/hid-core.c:2761
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x4d1/0xd90 drivers/base/dd.c:657
 __driver_probe_device+0x268/0x380 drivers/base/dd.c:799
 driver_probe_device+0x70/0x8b0 drivers/base/dd.c:829
 __device_attach_driver+0x4ee/0x950 drivers/base/dd.c:957
 bus_for_each_drv+0x3e3/0x680 drivers/base/bus.c:462
 __device_attach+0x3c8/0x5c0 drivers/base/dd.c:1029
 device_initial_probe+0x33/0x40 drivers/base/dd.c:1078
 bus_probe_device+0x3ba/0x5e0 drivers/base/bus.c:537
 device_add+0x12a9/0x1c10 drivers/base/core.c:3692
 hid_add_device+0x5ed/0x7b0 drivers/hid/hid-core.c:2907
 usbhid_probe+0x1fec/0x2660 drivers/hid/usbhid/hid-core.c:1435
 usb_probe_interface+0xd01/0x1310 drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x4d1/0xd90 drivers/base/dd.c:657
 __driver_probe_device+0x268/0x380 drivers/base/dd.c:799
 driver_probe_device+0x70/0x8b0 drivers/base/dd.c:829
 __device_attach_driver+0x4ee/0x950 drivers/base/dd.c:957
 bus_for_each_drv+0x3e3/0x680 drivers/base/bus.c:462
 __device_attach+0x3c8/0x5c0 drivers/base/dd.c:1029
 device_initial_probe+0x33/0x40 drivers/base/dd.c:1078
 bus_probe_device+0x3ba/0x5e0 drivers/base/bus.c:537
 device_add+0x12a9/0x1c10 drivers/base/core.c:3692
 usb_set_configuration+0x3493/0x3b70 drivers/usb/core/message.c:2210
 usb_generic_driver_probe+0xfc/0x290 drivers/usb/core/generic.c:250
 usb_probe_device+0x38d/0x690 drivers/usb/core/driver.c:291
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x4d1/0xd90 drivers/base/dd.c:657
 __driver_probe_device+0x268/0x380 drivers/base/dd.c:799
 driver_probe_device+0x70/0x8b0 drivers/base/dd.c:829
 __device_attach_driver+0x4ee/0x950 drivers/base/dd.c:957
 bus_for_each_drv+0x3e3/0x680 drivers/base/bus.c:462
 __device_attach+0x3c8/0x5c0 drivers/base/dd.c:1029
 device_initial_probe+0x33/0x40 drivers/base/dd.c:1078
 bus_probe_device+0x3ba/0x5e0 drivers/base/bus.c:537
 device_add+0x12a9/0x1c10 drivers/base/core.c:3692
 usb_new_device+0x104b/0x20c0 drivers/usb/core/hub.c:2663
 hub_port_connect drivers/usb/core/hub.c:5535 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5675 [inline]
 port_event drivers/usb/core/hub.c:5835 [inline]
 hub_event+0x5588/0x7580 drivers/usb/core/hub.c:5917
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xb8e/0x1d80 kernel/workqueue.c:3321
 worker_thread+0xedf/0x1590 kernel/workqueue.c:3402
 kthread+0xd5c/0xf00 kernel/kthread.c:464
 ret_from_fork+0x1e0/0x310 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Uninit was created at:
 slab_free_hook mm/slub.c:2307 [inline]
 slab_free mm/slub.c:4643 [inline]
 kfree+0x252/0xec0 mm/slub.c:4842
 kfree_const+0x42/0x50 mm/util.c:45
 kobject_cleanup lib/kobject.c:695 [inline]
 kobject_release lib/kobject.c:720 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x344/0x3b0 lib/kobject.c:737
 netdev_queue_update_kobjects+0x9b5/0xbf0 net/core/net-sysfs.c:2052
 remove_queue_kobjects net/core/net-sysfs.c:2149 [inline]
 netdev_unregister_kobject+0x176/0x530 net/core/net-sysfs.c:2304
 unregister_netdevice_many_notify+0x3cfb/0x4950 net/core/dev.c:12112
 unregister_netdevice_many+0x22/0x30 net/core/dev.c:12140
 ops_exit_rtnl_list net/core/net_namespace.c:188 [inline]
 ops_undo_list+0x5d8/0xb80 net/core/net_namespace.c:249
 cleanup_net+0xb8f/0x14b0 net/core/net_namespace.c:686
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xb8e/0x1d80 kernel/workqueue.c:3321
 worker_thread+0xedf/0x1590 kernel/workqueue.c:3402
 kthread+0xd5c/0xf00 kernel/kthread.c:464
 ret_from_fork+0x1e0/0x310 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Bytes 36-38 of 65535 are uninitialized
Memory access of size 65535 starts at ffff88808e6d5791

CPU: 1 UID: 0 PID: 17692 Comm: kworker/1:4 Not tainted 6.16.0-rc4-syzkaller-00013-g66701750d556 #0 PREEMPT(undef) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: usb_hub_wq hub_event
=====================================================


---
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@...glegroups.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

Powered by blists - more mailing lists