linux-kernel - Re: [syzbot] [usb?] [input?] WARNING in cm109_input_open/usb_submit

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Message-ID: <683b9f27.a00a0220.d8eae.0022.GAE@google.com>
Date: Sat, 31 May 2025 17:30:31 -0700
From: syzbot <syzbot+ac0f9c4cc1e034160492@...kaller.appspotmail.com>
To: dmitry.torokhov@...il.com, linux-input@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [usb?] [input?] WARNING in cm109_input_open/usb_submit_urb
 (3)

syzbot has found a reproducer for the following issue on:

HEAD commit:    0f70f5b08a47 Merge tag 'pull-automount' of git://git.kerne..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=150e0c82580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=22765942f2e2ebcf
dashboard link: https://syzkaller.appspot.com/bug?extid=ac0f9c4cc1e034160492
compiler:       Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=103dbed4580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=130e0c82580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f091df6896fd/disk-0f70f5b0.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/978b2a8699d8/vmlinux-0f70f5b0.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b6e13557ddc0/bzImage-0f70f5b0.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ac0f9c4cc1e034160492@...kaller.appspotmail.com

cm109 2-1:0.8: invalid payload size 1024, expected 4
input: CM109 USB driver as /devices/platform/dummy_hcd.1/usb2/2-1/2-1:0.8/input/input551
------------[ cut here ]------------
URB ffff88814caed700 submitted while active
WARNING: CPU: 0 PID: 6321 at drivers/usb/core/urb.c:379 usb_submit_urb+0xfa8/0x1870 drivers/usb/core/urb.c:379
Modules linked in:

CPU: 0 UID: 0 PID: 6321 Comm: kworker/0:8 Not tainted 6.15.0-syzkaller-09161-g0f70f5b08a47 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: usb_hub_wq hub_event
RIP: 0010:usb_submit_urb+0xfa8/0x1870 drivers/usb/core/urb.c:379
Code: 00 eb 5c e8 0a 68 a8 fa e9 09 f1 ff ff e8 00 68 a8 fa c6 05 f0 aa 71 08 01 90 48 c7 c7 00 5a 32 8c 48 89 de e8 a9 41 6c fa 90 <0f> 0b 90 90 e9 d0 f0 ff ff e8 da 67 a8 fa eb 11 e8 d3 67 a8 fa bd
RSP: 0018:ffffc9000d02eb38 EFLAGS: 00010246
RAX: a79c1e2737f67a00 RBX: ffff88814caed700 RCX: ffff88801e3f0000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: 000000000000000f R08: ffffffff8f9f7ff7 R09: 1ffffffff1f3effe
R10: dffffc0000000000 R11: fffffbfff1f3efff R12: 1ffff1100234820a
R13: dffffc0000000000 R14: ffff88814caed708 R15: 0000000000000cc0
FS:  0000000000000000(0000) GS:ffff888125c99000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555851e6da8 CR3: 000000002fb48000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 cm109_input_open+0x1fb/0x460 drivers/input/misc/cm109.c:566
 input_open_device+0x1c5/0x360 drivers/input/input.c:600
 kbd_connect+0xed/0x140 drivers/tty/vt/keyboard.c:1591
 input_attach_handler drivers/input/input.c:993 [inline]
 input_register_device+0xcee/0x10b0 drivers/input/input.c:2412
 cm109_usb_probe+0x118c/0x1690 drivers/input/misc/cm109.c:797
 usb_probe_interface+0x641/0xbc0 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+0x711/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>


---
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.