[syzbot] [usb?] WARNING in usb_ep_enable

[syzbot] [usb?] WARNING in usb_ep_enable

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    11028ab62899 Merge tag 'probes-fixes-v7.2-rc5' of git://gi..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=1673649e580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=cb17729fb04b1e3a
dashboard link: https://syzkaller.appspot.com/bug?extid=7b70c4a6021fd49c4151
compiler:       Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13074aea580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=161271b9580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/bc967be819a3/disk-11028ab6.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/6e9f003c9cc8/vmlinux-11028ab6.xz
kernel image: https://storage.googleapis.com/syzbot-assets/5c292926486f/bzImage-11028ab6.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7b70c4a6021fd49c4151@syzkaller.appspotmail.com

------------[ cut here ]------------
usb_ep_enable: ep129 (ep1in-bulk) has maxpacket 0
WARNING: drivers/usb/gadget/udc/core.c:125 at usb_ep_enable+0x148/0x480 drivers/usb/gadget/udc/core.c:124, CPU#1: ktimers/1/29
Modules linked in:
CPU: 1 UID: 0 PID: 29 Comm: ktimers/1 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:usb_ep_enable+0x1bc/0x480 drivers/usb/gadget/udc/core.c:124
Code: 4a 17 02 fb 49 83 3f 00 48 c7 c0 60 b3 1f 8c 49 c7 c0 80 b3 1f 8c 4c 0f 44 c0 4c 89 f7 48 c7 c6 8b 42 b0 8d 44 89 ea 4c 89 e1 <67> 48 0f b9 3a bd ea ff ff ff 0f 1f 44 00 00 e8 40 a4 98 fa 65 8b
RSP: 0018:ffffc90000a3f6b8 EFLAGS: 00010282
RAX: ffffffff8c1fb360 RBX: ffff88802a08c120 RCX: ffffffff8c1fd1e0
RDX: 0000000000000081 RSI: ffffffff8db0428b RDI: ffffffff8fbc9d40
RBP: dffffc0000000000 R08: ffffffff8c1fb380 R09: 0000000000000100
R10: 0000000000000100 R11: 0000000000000003 R12: ffffffff8c1fd1e0
R13: 0000000000000081 R14: ffffffff8fbc9d40 R15: ffff88802a08c138
FS:  0000000000000000(0000) GS:ffff888125d41000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000563af0aa84a0 CR3: 00000000382cc000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 hidg_set_alt+0x12a/0xa50 drivers/usb/gadget/function/f_hid.c:1042
 set_config+0x749/0x1160 drivers/usb/gadget/composite.c:1018
 composite_setup+0x1de7/0x3480 drivers/usb/gadget/composite.c:1901
 configfs_composite_setup+0xbd/0x100 drivers/usb/gadget/configfs.c:1877
 dummy_timer+0x2f77/0x4d50 drivers/usb/gadget/udc/dummy_hcd.c:1951
 __run_hrtimer kernel/time/hrtimer.c:2032 [inline]
 __hrtimer_run_queues+0x3eb/0xaf0 kernel/time/hrtimer.c:2096
 hrtimer_run_softirq+0x18f/0x260 kernel/time/hrtimer.c:2113
 handle_softirqs+0x1d9/0x6c0 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 run_ktimerd+0x69/0x100 kernel/softirq.c:1151
 smpboot_thread_fn+0x57c/0xa80 kernel/smpboot.c:160
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
----------------
Code disassembly (best guess):
   0:	4a 17                	rex.WX (bad)
   2:	02 fb                	add    %bl,%bh
   4:	49 83 3f 00          	cmpq   $0x0,(%r15)
   8:	48 c7 c0 60 b3 1f 8c 	mov    $0xffffffff8c1fb360,%rax
   f:	49 c7 c0 80 b3 1f 8c 	mov    $0xffffffff8c1fb380,%r8
  16:	4c 0f 44 c0          	cmove  %rax,%r8
  1a:	4c 89 f7             	mov    %r14,%rdi
  1d:	48 c7 c6 8b 42 b0 8d 	mov    $0xffffffff8db0428b,%rsi
  24:	44 89 ea             	mov    %r13d,%edx
  27:	4c 89 e1             	mov    %r12,%rcx
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	bd ea ff ff ff       	mov    $0xffffffea,%ebp
  34:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  39:	e8 40 a4 98 fa       	call   0xfa98a47e
  3e:	65                   	gs
  3f:	8b                   	.byte 0x8b


---
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@googlegroups.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 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.

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

Re: [syzbot] [usb?] WARNING in usb_ep_enable

[syzbot]

syzbot has bisected this issue to:

commit 973a57891608a98e894db2887f278777f564de18
Author: Chris Wulff <crwulff@gmail.com>
Date:   Thu Jul 25 01:04:20 2024 +0000

    usb: gadget: core: Check for unset descriptor

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=136cf5b9580000
start commit:   11028ab62899 Merge tag 'probes-fixes-v7.2-rc5' of git://gi..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=10ecf5b9580000
console output: https://syzkaller.appspot.com/x/log.txt?x=176cf5b9580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=cb17729fb04b1e3a
dashboard link: https://syzkaller.appspot.com/bug?extid=7b70c4a6021fd49c4151
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13074aea580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=161271b9580000

Reported-by: syzbot+7b70c4a6021fd49c4151@syzkaller.appspotmail.com
Fixes: 973a57891608 ("usb: gadget: core: Check for unset descriptor")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection

Forwarded: Re: [PATCH] usb: gadget: f_hid: reject zero report length

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com.

***

Subject: Re: [PATCH] usb: gadget: f_hid: reject zero report length
Author: lurenjia534@outlook.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git 5d5fd841c34649f1b09220fe58e59dffd61c447d