[syzbot] [pvrusb2?] [usb?] WARNING in pvr2_send_request_ex

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 7d31f578f323 Add linux-next specific files for 20251128
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=12e42192580000
kernel config: https://syzkaller.appspot.com/x/.config?x=ec890b8333fce099
dashboard link: https://syzkaller.appspot.com/bug?extid=405dcd13121ff75a9e16
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10de0512580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17392512580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/9bcc6eb60940/disk-7d31f578.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/895bc1bfae48/vmlinux-7d31f578.xz
kernel image: https://storage.googleapis.com/syzbot-assets/48f15e4679f3/bzImage-7d31f578.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+405dcd...@syzkaller.appspotmail.com

pvrusb2: Invalid read control endpoint
------------[ cut here ]------------
URB ffff88814e172b00 submitted while active
WARNING: drivers/usb/core/urb.c:380 at 0x0, CPU#0: pvrusb2-context/2345
Modules linked in:
CPU: 0 UID: 0 PID: 2345 Comm: pvrusb2-context Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:usb_submit_urb+0x7e/0x18d0 drivers/usb/core/urb.c:380
Code: 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 07 cf 20 fb 49 83 3e 00 74 40 e8 6c 82 ba fa 48 8d 3d e5 1e c8 08 48 89 de <67> 48 0f b9 3a b8 f0 ff ff ff eb 11 e8 51 82 ba fa eb 05 e8 4a 82
RSP: 0018:ffffc90004f268a0 EFLAGS: 00010293
RAX: ffffffff870770c4 RBX: ffff88814e172b00 RCX: ffff88802a5c8000
RDX: 0000000000000000 RSI: ffff88814e172b00 RDI: ffffffff8fcf8fb0
RBP: ffffc90004f26b00 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1f85a8f R12: 0000000000000cc0
R13: ffff88806783d5f8 R14: ffff88814e172b08 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff888125a03000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f910bc43e9c CR3: 000000000e13a000 CR4: 00000000003526f0
Call Trace:
<TASK>
pvr2_send_request_ex+0xc2a/0x2030 drivers/media/usb/pvrusb2/pvrusb2-hdw.c:3676
pvr2_send_request+0x38/0x50 drivers/media/usb/pvrusb2/pvrusb2-hdw.c:3819
pvr2_i2c_read drivers/media/usb/pvrusb2/pvrusb2-i2c-core.c:130 [inline]
pvr2_i2c_basic_op+0x44e/0x930 drivers/media/usb/pvrusb2/pvrusb2-i2c-core.c:172
pvr2_i2c_xfer+0x9e3/0xda0 drivers/media/usb/pvrusb2/pvrusb2-i2c-core.c:445
__i2c_transfer+0x871/0x2110 drivers/i2c/i2c-core-base.c:-1
i2c_smbus_xfer_emulated drivers/i2c/i2c-core-smbus.c:470 [inline]
__i2c_smbus_xfer+0xf80/0x1e40 drivers/i2c/i2c-core-smbus.c:608
i2c_smbus_xfer+0x275/0x3c0 drivers/i2c/i2c-core-smbus.c:546
i2c_smbus_read_byte_data+0xfe/0x1c0 drivers/i2c/i2c-core-smbus.c:143
saa711x_detect_chip drivers/media/i2c/saa7115.c:1710 [inline]
saa711x_probe+0x1c1/0x1570 drivers/media/i2c/saa7115.c:1816
i2c_device_probe+0x87e/0xc00 drivers/i2c/i2c-core-base.c:592
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x26d/0xad0 drivers/base/dd.c:659
__driver_probe_device+0x18c/0x320 drivers/base/dd.c:801
driver_probe_device+0x4f/0x240 drivers/base/dd.c:831
__device_attach_driver+0x279/0x430 drivers/base/dd.c:959
bus_for_each_drv+0x251/0x2e0 drivers/base/bus.c:500
__device_attach+0x2b8/0x430 drivers/base/dd.c:1031
device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1086
bus_probe_device+0x12a/0x220 drivers/base/bus.c:574
device_add+0x7b6/0xb80 drivers/base/core.c:3689
i2c_new_client_device+0xa11/0x1150 drivers/i2c/i2c-core-base.c:1019
v4l2_i2c_new_subdev_board+0x86/0x250 drivers/media/v4l2-core/v4l2-i2c.c:81
v4l2_i2c_new_subdev+0x14a/0x1e0 drivers/media/v4l2-core/v4l2-i2c.c:136
pvr2_hdw_load_subdev drivers/media/usb/pvrusb2/pvrusb2-hdw.c:-1 [inline]
pvr2_hdw_load_modules drivers/media/usb/pvrusb2/pvrusb2-hdw.c:2074 [inline]
pvr2_hdw_setup_low drivers/media/usb/pvrusb2/pvrusb2-hdw.c:2155 [inline]
pvr2_hdw_setup drivers/media/usb/pvrusb2/pvrusb2-hdw.c:2261 [inline]
pvr2_hdw_initialize+0xe18/0x3ac0 drivers/media/usb/pvrusb2/pvrusb2-hdw.c:2338
pvr2_context_check drivers/media/usb/pvrusb2/pvrusb2-context.c:111 [inline]
pvr2_context_thread_func+0x487/0xaf0 drivers/media/usb/pvrusb2/pvrusb2-context.c:158
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
</TASK>
----------------
Code disassembly (best guess):
0: 89 f0 mov %esi,%eax
2: 48 c1 e8 03 shr $0x3,%rax
6: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1)
b: 74 08 je 0x15
d: 4c 89 f7 mov %r14,%rdi
10: e8 07 cf 20 fb call 0xfb20cf1c
15: 49 83 3e 00 cmpq $0x0,(%r14)
19: 74 40 je 0x5b
1b: e8 6c 82 ba fa call 0xfaba828c
20: 48 8d 3d e5 1e c8 08 lea 0x8c81ee5(%rip),%rdi # 0x8c81f0c
27: 48 89 de mov %rbx,%rsi
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: b8 f0 ff ff ff mov $0xfffffff0,%eax
34: eb 11 jmp 0x47
36: e8 51 82 ba fa call 0xfaba828c
3b: eb 05 jmp 0x42
3d: e8 .byte 0xe8
3e: 4a rex.WX
3f: 82 .byte 0x82


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