[syzbot] [media?] WARNING in cx25840_init

[syzbot] [media?] WARNING in cx25840_init

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    940de590b839 Merge tag 'hardening-v7.3-rc2' of git://git.k..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=10c8cb49580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=5e4e3a0e188a497e
dashboard link: https://syzkaller.appspot.com/bug?extid=9123948aef13fe92d706
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=17faf0f9580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14d948f9580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/5902f4c02b2e/disk-940de590.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/3473a7c7a754/vmlinux-940de590.xz
kernel image: https://storage.googleapis.com/syzbot-assets/010eec830bfe/bzImage-940de590.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9123948aef13fe92d706@syzkaller.appspotmail.com

dvb-usb: bulk message failed: -71 (9/0)
dvb-usb: bulk message failed: -71 (9/0)
dvb-usb: bulk message failed: -71 (6/0)
dvb-usb: bulk message failed: -71 (9/0)
dvb-usb: bulk message failed: -71 (6/0)
dvb-usb: bulk message failed: -71 (9/0)
dvb-usb: bulk message failed: -71 (6/0)
dvb-usb: bulk message failed: -71 (9/0)
dvb-usb: bulk message failed: -71 (9/0)
------------[ cut here ]------------
1
WARNING: drivers/media/i2c/cx25840/cx25840-core.c:2313 at cx25840_init+0xa3/0x110 drivers/media/i2c/cx25840/cx25840-core.c:2313, CPU#0: kworker/0:2/983
Modules linked in:
CPU: 0 UID: 0 PID: 983 Comm: kworker/0:2 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026
Workqueue: usb_hub_wq hub_event
RIP: 0010:cx25840_init+0xa3/0x110 drivers/media/i2c/cx25840/cx25840-core.c:2313
Code: e4 02 00 00 4c 89 f0 48 c1 e8 03 42 0f b6 04 20 84 c0 75 5e 41 c7 06 2a b5 2a 01 89 de e8 c5 66 00 00 eb 09 e8 fe db c2 f9 90 <0f> 0b 90 31 c0 5b 41 5c 41 5e 41 5f 5d e9 d6 61 0b f9 cc 89 f9 80
RSP: 0018:ffffc90004a06bd0 EFLAGS: 00010293
RAX: ffffffff8804df22 RBX: 00000000000ac8aa RCX: ffff8880271f3e80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 0000000000000000 R08: ffff8880226e01bb R09: 1ffff110044dc037
R10: dffffc0000000000 R11: ffffffff8804de80 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff88801bb05040 R15: ffff88801bb05338
FS:  0000000000000000(0000) GS:ffff888124cda000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f938c09caa0 CR3: 000000007f389000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 cxusb_medion_register_analog_subdevs drivers/media/usb/dvb-usb/cxusb-analog.c:1730 [inline]
 cxusb_medion_register_analog+0x307/0x1130 drivers/media/usb/dvb-usb/cxusb-analog.c:1793
 cxusb_probe+0x664/0x710 drivers/media/usb/dvb-usb/cxusb.c:1615
 usb_probe_interface+0x788/0xe50 drivers/usb/core/driver.c:399
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x254/0xae0 drivers/base/dd.c:706
 __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868
 driver_probe_device+0x4f/0x240 drivers/base/dd.c:898
 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1026
 bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500
 __device_attach+0x2c4/0x450 drivers/base/dd.c:1098
 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153
 bus_probe_device+0x12a/0x220 drivers/base/bus.c:620
 device_add+0x7d7/0xb80 drivers/base/core.c:3776
 usb_set_configuration+0x1ad8/0x2180 drivers/usb/core/message.c:2268
 usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250
 usb_probe_device+0x1c3/0x3b0 drivers/usb/core/driver.c:293
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x254/0xae0 drivers/base/dd.c:706
 __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868
 driver_probe_device+0x4f/0x240 drivers/base/dd.c:898
 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1026
 bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500
 __device_attach+0x2c4/0x450 drivers/base/dd.c:1098
 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153
 bus_probe_device+0x12a/0x220 drivers/base/bus.c:620
 device_add+0x7d7/0xb80 drivers/base/core.c:3776
 usb_new_device+0x9aa/0x1690 drivers/usb/core/hub.c:2708
 hub_port_connect drivers/usb/core/hub.c:5580 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5720 [inline]
 port_event drivers/usb/core/hub.c:5884 [inline]
 hub_event+0x28e8/0x4d30 drivers/usb/core/hub.c:5966
 process_one_work kernel/workqueue.c:3396 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
 kthread+0x38b/0x480 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>


---
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Re: [syzbot] [media?] WARNING in cx25840_init

[syzbot]

> #syz test: git:// git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 940de590b839f71d6dc846160534bf202401b8b7 diff --git a/drivers/media/i2c/cx25840/cx25840-core.c b/drivers/media/i2c/cx25840/cx25840-core.c index a8e21a28174f..6df912c9381b 100644 --- a/drivers/media/i2c/cx25840/cx25840-core.c +++ b/drivers/media/i2c/cx25840/cx25840-core.c @@ -2298,28 +2298,26 @@ static int cx25840_init(struct v4l2_subdev *sd, u32 val) struct cx25840_state *state = to_state(sd); + if (!is_cx2584x(state)) + return -EOPNOTSUPP; + state->generic_mode = true; - if (is_cx2584x(state)) { - /* set datasheet video output defaults */ - state->vid_config = CX25840_VCONFIG_FMT_BT656 | - CX25840_VCONFIG_RES_8BIT | - CX25840_VCONFIG_VBIRAW_DISABLED | - CX25840_VCONFIG_ANCDATA_ENABLED | - CX25840_VCONFIG_TASKBIT_ONE | - CX25840_VCONFIG_ACTIVE_HORIZONTAL | - CX25840_VCONFIG_VALID_NORMAL | - CX25840_VCONFIG_HRESETW_NORMAL | - CX25840_VCONFIG_CLKGATE_NONE | - CX25840_VCONFIG_DCMODE_DWORDS | - CX25840_VCONFIG_IDID0S_NORMAL | - CX25840_VCONFIG_VIPCLAMP_DISABLED; - - /* add additional settings */ - cx25840_vconfig_add(state, val); - } else { - /* TODO: generic mode needs to be developed for other chips */ - WARN_ON(1); - } + /* set datasheet video output defaults */ + state->vid_config = CX25840_VCONFIG_FMT_BT656 | + CX25840_VCONFIG_RES_8BIT | + CX25840_VCONFIG_VBIRAW_DISABLED | + CX25840_VCONFIG_ANCDATA_ENABLED | + CX25840_VCONFIG_TASKBIT_ONE | + CX25840_VCONFIG_ACTIVE_HORIZONTAL | + CX25840_VCONFIG_VALID_NORMAL | + CX25840_VCONFIG_HRESETW_NORMAL | + CX25840_VCONFIG_CLKGATE_NONE | + CX25840_VCONFIG_DCMODE_DWORDS | + CX25840_VCONFIG_IDID0S_NORMAL | + CX25840_VCONFIG_VIPCLAMP_DISABLED; + + /* add additional settings */ + cx25840_vconfig_add(state, val); return 0; }

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