[syzbot] [usb?] general protection fault in set_link_state (2)

[syzbot <syzbot+70d28f5ea6d18a5e60fe@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    3dab139d4795 Merge tag 'rust-fixes-7.2-2' of git://git.ker..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=127327b1580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=145fa60d73086782
dashboard link: https://syzkaller.appspot.com/bug?extid=70d28f5ea6d18a5e60fe
compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1131a499580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14063fde580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-3dab139d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2b5a401a9dc7/vmlinux-3dab139d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/7ed2d255bd44/bzImage-3dab139d.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+70d28f5ea6d18a5e60fe@syzkaller.appspotmail.com

dummy_hcd dummy_hcd.0: remove, state 1
usb usb5: USB disconnect, device number 1
usb 5-1: USB disconnect, device number 2
dummy_hcd dummy_hcd.0: stopped
dummy_hcd dummy_hcd.0: USB bus 5 deregistered
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 UID: 0 PID: 5923 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:set_link_state+0x2c/0xf20 drivers/usb/gadget/udc/dummy_hcd.c:436
Code: 41 56 41 55 41 54 55 53 48 89 fb 48 83 ec 50 48 89 7c 24 10 e8 55 86 39 fa 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 a2 0e 00 00 48 8b 44 24 10 4c 8d b0 a3 00 00 00
RSP: 0018:ffffc90003d37b50 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff87d0e7d3
RDX: 0000000000000000 RSI: ffffffff87d0d64b RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000293
R13: ffff88802c04c000 R14: 0000000000000000 R15: ffff88802c04cc00
FS:  000055557fbdd500(0000) GS:ffff8880d5dde000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2c9b3a1796 CR3: 0000000047fb9000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 dummy_pullup+0xf3/0x170 drivers/usb/gadget/udc/dummy_hcd.c:915
 usb_gadget_disconnect_locked+0x142/0x4e0 drivers/usb/gadget/udc/core.c:785
 gadget_unbind_driver+0xd8/0x4f0 drivers/usb/gadget/udc/core.c:1718
 device_remove+0xcb/0x180 drivers/base/dd.c:616
 __device_release_driver drivers/base/dd.c:1349 [inline]
 device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372
 driver_detach+0xd8/0x1b0 drivers/base/dd.c:1435
 bus_remove_driver+0x13b/0x2e0 drivers/base/bus.c:832
 driver_unregister+0x76/0xb0 drivers/base/driver.c:202
 usb_gadget_unregister_driver+0x49/0x70 drivers/usb/gadget/udc/core.c:1784
 raw_release+0x19b/0x260 drivers/usb/gadget/legacy/raw_gadget.c:463
 __fput+0x3ff/0xb50 fs/file_table.c:512
 task_work_run+0x150/0x240 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:70 [inline]
 exit_to_user_mode_loop+0x1d8/0x6f0 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x666/0x870 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f153619de99
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe765355e8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ffe765356d0 RCX: 00007f153619de99
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 000000000000d9ef R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b32920000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1536425fac R14: 00007f1536425fa8 R15: 00007f1536425fa0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:set_link_state+0x2c/0xf20 drivers/usb/gadget/udc/dummy_hcd.c:436
Code: 41 56 41 55 41 54 55 53 48 89 fb 48 83 ec 50 48 89 7c 24 10 e8 55 86 39 fa 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 a2 0e 00 00 48 8b 44 24 10 4c 8d b0 a3 00 00 00
RSP: 0018:ffffc90003d37b50 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff87d0e7d3
RDX: 0000000000000000 RSI: ffffffff87d0d64b RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000293
R13: ffff88802c04c000 R14: 0000000000000000 R15: ffff88802c04cc00
FS:  000055557fbdd500(0000) GS:ffff8880d5dde000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2c9b3a1796 CR3: 0000000047fb9000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
   0:	41 56                	push   %r14
   2:	41 55                	push   %r13
   4:	41 54                	push   %r12
   6:	55                   	push   %rbp
   7:	53                   	push   %rbx
   8:	48 89 fb             	mov    %rdi,%rbx
   b:	48 83 ec 50          	sub    $0x50,%rsp
   f:	48 89 7c 24 10       	mov    %rdi,0x10(%rsp)
  14:	e8 55 86 39 fa       	call   0xfa39866e
  19:	48 89 da             	mov    %rbx,%rdx
  1c:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  23:	fc ff df
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 a2 0e 00 00    	jne    0xed6
  34:	48 8b 44 24 10       	mov    0x10(%rsp),%rax
  39:	4c 8d b0 a3 00 00 00 	lea    0xa3(%rax),%r14


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