linux-kernel - Re: [syzbot] [usb?] [input?] WARNING in input_unregister

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Message-ID: <0000000000008b34440611929e64@google.com>
Date: Sat, 17 Feb 2024 04:01:23 -0800
From: syzbot <syzbot+617f4ccb03b9869f6494@...kaller.appspotmail.com>
To: gregkh@...uxfoundation.org, linux-input@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org, rafael@...nel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [usb?] [input?] WARNING in input_unregister_device (2)

syzbot has found a reproducer for the following issue on:

HEAD commit:    c1ca10ceffbb Merge tag 'scsi-fixes' of git://git.kernel.or..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15159df0180000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1d7c92dd8d5c7a1e
dashboard link: https://syzkaller.appspot.com/bug?extid=617f4ccb03b9869f6494
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11f415fc180000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17ecf362180000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/842b77f831b0/disk-c1ca10ce.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/057da06d8a4b/vmlinux-c1ca10ce.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d4382274a169/bzImage-c1ca10ce.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+617f4ccb03b9869f6494@...kaller.appspotmail.com

input: HID 045e:07da as /devices/platform/dummy_hcd.0/usb1/1-1/1-1:0.0/0003:045E:07DA.0060/input/input100
microsoft 0003:045E:07DA.0060: input,hidraw0: USB HID v0.00 Device [HID 045e:07da] on usb-dummy_hcd.0-1/input0
usb 1-1: USB disconnect, device number 97
------------[ cut here ]------------
add_uevent_var: buffer size too small
WARNING: CPU: 0 PID: 782 at lib/kobject_uevent.c:671 add_uevent_var+0x2d5/0x450 lib/kobject_uevent.c:671
Modules linked in:
CPU: 0 PID: 782 Comm: kworker/0:2 Not tainted 6.8.0-rc4-syzkaller-00331-gc1ca10ceffbb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Workqueue: usb_hub_wq hub_event
RIP: 0010:add_uevent_var+0x2d5/0x450 lib/kobject_uevent.c:671
Code: 0f b6 04 27 84 c0 0f 85 28 01 00 00 48 8b 44 24 18 01 18 31 c0 eb 2b e8 09 07 39 f6 90 48 c7 c7 60 e3 c5 8c e8 0c 12 fd f5 90 <0f> 0b 90 90 b8 f4 ff ff ff 49 bc 00 00 00 00 00 fc ff df 4c 8b 6c
RSP: 0018:ffffc90003d3ef20 EFLAGS: 00010246
RAX: 7e434c7b33a2b100 RBX: 00000000000007f5 RCX: ffff88801fd91dc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90003d3f050 R08: ffffffff81577992 R09: 1ffff920007a7d84
R10: dffffc0000000000 R11: fffff520007a7d85 R12: 000000000000000b
R13: 000000000000000b R14: 1ffff1100fc77443 R15: 1ffff1100fc77543
FS:  0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc10ead20f0 CR3: 000000002db96000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kobject_uevent_env+0x520/0x8f0 lib/kobject_uevent.c:588
 device_del+0x812/0xa30 drivers/base/core.c:3832
 input_unregister_device+0xa3/0x100 drivers/input/input.c:2440
 hidinput_disconnect+0x26c/0x300 drivers/hid/hid-input.c:2388
 hid_disconnect drivers/hid/hid-core.c:2280 [inline]
 hid_hw_stop+0x75/0x1e0 drivers/hid/hid-core.c:2329
 ms_remove+0x23/0xa0 drivers/hid/hid-microsoft.c:409
 hid_device_remove+0x225/0x370
 device_remove drivers/base/dd.c:567 [inline]
 __device_release_driver drivers/base/dd.c:1272 [inline]
 device_release_driver_internal+0x4a9/0x7c0 drivers/base/dd.c:1295
 bus_remove_device+0x34f/0x420 drivers/base/bus.c:574
 device_del+0x580/0xa30 drivers/base/core.c:3814
 hid_remove_device drivers/hid/hid-core.c:2867 [inline]
 hid_destroy_device+0x68/0x100 drivers/hid/hid-core.c:2887
 usbhid_disconnect+0x9e/0xc0 drivers/hid/usbhid/hid-core.c:1456
 usb_unbind_interface+0x1d4/0x850 drivers/usb/core/driver.c:461
 device_remove drivers/base/dd.c:569 [inline]
 __device_release_driver drivers/base/dd.c:1272 [inline]
 device_release_driver_internal+0x503/0x7c0 drivers/base/dd.c:1295
 bus_remove_device+0x34f/0x420 drivers/base/bus.c:574
 device_del+0x580/0xa30 drivers/base/core.c:3814
 usb_disable_device+0x3bf/0x850 drivers/usb/core/message.c:1416
 usb_disconnect+0x340/0x950 drivers/usb/core/hub.c:2267
 hub_port_connect drivers/usb/core/hub.c:5323 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5623 [inline]
 port_event drivers/usb/core/hub.c:5783 [inline]
 hub_event+0x1e62/0x50f0 drivers/usb/core/hub.c:5865
 process_one_work kernel/workqueue.c:2633 [inline]
 process_scheduled_works+0x913/0x1420 kernel/workqueue.c:2706
 worker_thread+0xa5f/0x1000 kernel/workqueue.c:2787
 kthread+0x2ef/0x390 kernel/kthread.c:388
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242
 </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.