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Precedence: bulk
MIME-Version: 1.0
From: Chenyuan Yang <chenyuan0y@gmail.com>
Date: Fri, 2 Feb 2024 12:59:31 -0600
Message-ID: <CALGdzurBnMztPW1Q8mujfYaopVQ8MkSUXUvnAqJcLGu5ROSU4Q@mail.gmail.com>
Subject: [Linux Kernel Bug][usb/f_printer] WARNING in usb_ep_queue
To: gregkh@linuxfoundation.org, azeemshaikh38@gmail.com, 
	ivan.orlov0322@gmail.com, benjamin.tissoires@redhat.com, 
	linux-usb@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, syzkaller@googlegroups.com, 
	Zijie Zhao <zzjas98@gmail.com>
Content-Type: multipart/mixed; boundary="000000000000f9a18406106ab6b9"

--000000000000f9a18406106ab6b9
Content-Type: text/plain; charset="UTF-8"

Dear Linux Developers for F_printer,

We encountered "WARNING in usb_ep_queue" when testing the f_printer driver with
Syzkaller and our generated specifications.

I attached the report and C/syz reproducers for this crash.

```
------------[ cut here ]------------
WARNING: CPU: 1 PID: 10395 at drivers/usb/gadget/udc/core.c:295
usb_ep_queue+0xa0/0x300 linux/drivers/usb/gadget/udc/core.c:295
Modules linked in:
CPU: 1 PID: 10395 Comm: syz-executor364 Not tainted 6.6.0-gd2f51b3516da #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
RIP: 0010:usb_ep_queue+0xa0/0x300 linux/drivers/usb/gadget/udc/core.c:295
Code: 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 31 02 00 00 0f b6
5d 35 31 ff 89 de e8 da 51 08 fa 84 db 74 11 e8 01 56 08 fa 90 <0f> 0b
90 41 bd 94 ff ff ff eb 56 e8 f0 55 08 fa 48 8d 7d 10 48 b8
RSP: 0018:ffffc900075cfc00 EFLAGS: 00010093
RAX: 0000000000000000 RBX: 0000000000000081 RCX: ffffffff8786e5a6
RDX: ffff88801cd59e00 RSI: ffffffff8786e5af RDI: 0000000000000001
RBP: ffff8880173d80e0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000081 R11: 0000000000000000 R12: ffff888019236e10
R13: 0000000000000820 R14: 0000000000000000 R15: ffff888019236e58
FS:  000055555591d3c0(0000) GS:ffff88807ec00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020c55000 CR3: 0000000024d03000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 printer_write+0x650/0xf30 linux/drivers/usb/gadget/function/f_printer.c:669
 vfs_write+0x2ae/0xd80 linux/fs/read_write.c:582
 ksys_write+0x127/0x250 linux/fs/read_write.c:637
 do_syscall_x64 linux/arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x40/0x110 linux/arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f1c4a60e3bd
Code: c3 e8 87 20 00 00 0f 1f 80 00 00 00 00 f3 0f 1e fa 48 89 f8 48
89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d
01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd3d68a858 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 00007f1c4a60e3bd
RDX: 000000000000004f RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007f1c4a663cd5 R09: 00007f1c4a663cd5
R10: 00237265746e6972 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffd3d68aab8 R14: 00007ffd3d68a880 R15: 00007ffd3d68a870
 </TASK>
```

It seems that the `WARN_ON_ONCE(!ep->enabled && ep->address)` in
usb_ep_queue (https://elixir.bootlin.com/linux/v6.7/source/drivers/usb/gadget/udc/core.c#L290),
which is invoked by `printer_write`
(https://elixir.bootlin.com/linux/v6.7/source/drivers/usb/gadget/function/f_printer.c#L669).

If you have any questions or require more information, please feel
free to contact us.

Reported-by: Chenyuan Yang <chenyuan0y@gmail.com>

Best,
Chenyuan

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