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Message-ID: <dc38c3d9-d272-9bcc-7f6a-a4fdf85016e0@gmail.com>
Date: Fri, 9 Apr 2021 10:40:27 -0300
From: Igor Torrente <igormtorrente@...il.com>
To: Shuah Khan <skhan@...uxfoundation.org>, mchehab@...nel.org
Cc: syzbot+b2391895514ed9ef4a8e@...kaller.appspotmail.com,
linux-media@...r.kernel.org,
linux-kernel-mentees@...ts.linuxfoundation.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: em28xx: Fix race condition between open and init
function
On 4/8/21 2:37 PM, Shuah Khan wrote:
> On 4/8/21 6:10 AM, Igor Matheus Andrade Torrente wrote:
>> Fixes a race condition - for lack of a more precise term - between
>> em28xx_v4l2_open and em28xx_v4l2_init, by detaching the v4l2_dev,
>> media_pad and vdev structs from the em28xx_v4l2, and managing the
>> lifetime of those objects more dynamicaly.
>>
>> The race happens when a thread[1] - containing the em28xx_v4l2_init()
>> code - calls the v4l2_mc_create_media_graph(), and it return a error,
>> if a thread[2] - running v4l2_open() - pass the verification point
>> and reaches the em28xx_v4l2_open() before the thread[1] finishes
>> the v4l2 subsystem deregistration, thread[1] will free all resources
>> before the em28xx_v4l2_open() can process their things,
>> because the em28xx_v4l2_init() has the dev->lock. And all this lead
>> the thread[2] to cause a user-after-free.
>>
>
> Have you tried this patch with em28xx device? You will have to take into
> account the dependencies between the subdevs using the v4l2_dev.
>
No, I didn't because I don't have the device.
I was using the syzbot .c that produces this use-after-free.
I will try to modify the .c to test a complete initialization.
Actually, I forgot to put RFC alongside [PATCH].
> Also try rmmod invidual drivers - what happens if you were to rmmod a
> subdev driver? With v4l2_dev is not embedded in v4l2, this could open
> up memory leaks or user-after-frees.
>
OK. Let me see what I can do.
>> Reported-and-tested-by:
>> syzbot+b2391895514ed9ef4a8e@...kaller.appspotmail.com
>> Signed-off-by: Igor Matheus Andrade Torrente <igormtorrente@...il.com>
>> ---
>> drivers/media/usb/em28xx/em28xx-camera.c | 4 +-
>> drivers/media/usb/em28xx/em28xx-video.c | 188 ++++++++++++++---------
>> drivers/media/usb/em28xx/em28xx.h | 6 +-
>> 3 files changed, 123 insertions(+), 75 deletions(-)
>>
>> diff --git a/drivers/media/usb/em28xx/em28xx-camera.c
>> b/drivers/media/usb/em28xx/em28xx-camera.c
>> index d1e66b503f4d..436c5a8cbbb6 100644
>> --- a/drivers/media/usb/em28xx/em28xx-camera.c
>> +++ b/drivers/media/usb/em28xx/em28xx-camera.c
>> @@ -340,7 +340,7 @@ int em28xx_init_camera(struct em28xx *dev)
>> v4l2->sensor_xtal = 4300000;
>> pdata.xtal = v4l2->sensor_xtal;
>> if (NULL ==
>> - v4l2_i2c_new_subdev_board(&v4l2->v4l2_dev, adap,
>> + v4l2_i2c_new_subdev_board(v4l2->v4l2_dev, adap,
>> &mt9v011_info, NULL))
>> return -ENODEV;
>> v4l2->vinmode = EM28XX_VINMODE_RGB8_GRBG;
>> @@ -394,7 +394,7 @@ int em28xx_init_camera(struct em28xx *dev)
>> v4l2->sensor_yres = 480;
>> subdev =
>> - v4l2_i2c_new_subdev_board(&v4l2->v4l2_dev, adap,
>> + v4l2_i2c_new_subdev_board(v4l2->v4l2_dev, adap,
>> &ov2640_info, NULL);
>> if (!subdev)
>> return -ENODEV;
>> diff --git a/drivers/media/usb/em28xx/em28xx-video.c
>> b/drivers/media/usb/em28xx/em28xx-video.c
>> index 6b84c3413e83..e1febb2bf06b 100644
>> --- a/drivers/media/usb/em28xx/em28xx-video.c
>> +++ b/drivers/media/usb/em28xx/em28xx-video.c
>> @@ -184,7 +184,7 @@ static int em28xx_vbi_supported(struct em28xx *dev)
>> */
>> static void em28xx_wake_i2c(struct em28xx *dev)
>> {
>> - struct v4l2_device *v4l2_dev = &dev->v4l2->v4l2_dev;
>> + struct v4l2_device *v4l2_dev = dev->v4l2->v4l2_dev;
>> v4l2_device_call_all(v4l2_dev, 0, core, reset, 0);
>> v4l2_device_call_all(v4l2_dev, 0, video, s_routing,
>> @@ -974,9 +974,17 @@ static void em28xx_v4l2_create_entities(struct
>> em28xx *dev)
>> struct em28xx_v4l2 *v4l2 = dev->v4l2;
>> int ret, i;
>> + v4l2->video_pad = kzalloc(sizeof(*v4l2->video_pad), GFP_KERNEL);
>> + if (!v4l2->video_pad) {
>> + dev_err(&dev->intf->dev,
>> + "failed to allocate video pad memory!\n");
>> + v4l2->vdev->entity.num_pads = 0;
>> + return;
>> + }
>> +
>> /* Initialize Video, VBI and Radio pads */
>> - v4l2->video_pad.flags = MEDIA_PAD_FL_SINK;
>> - ret = media_entity_pads_init(&v4l2->vdev.entity, 1,
>> &v4l2->video_pad);
>> + v4l2->video_pad->flags = MEDIA_PAD_FL_SINK;
>> + ret = media_entity_pads_init(&v4l2->vdev->entity, 1,
>> v4l2->video_pad);
>> if (ret < 0)
>> dev_err(&dev->intf->dev,
>> "failed to initialize video media entity!\n");
>> @@ -1132,11 +1140,11 @@ int em28xx_start_analog_streaming(struct
>> vb2_queue *vq, unsigned int count)
>> f.type = V4L2_TUNER_RADIO;
>> else
>> f.type = V4L2_TUNER_ANALOG_TV;
>> - v4l2_device_call_all(&v4l2->v4l2_dev,
>> + v4l2_device_call_all(v4l2->v4l2_dev,
>> 0, tuner, s_frequency, &f);
>> /* Enable video stream at TV decoder */
>> - v4l2_device_call_all(&v4l2->v4l2_dev, 0, video, s_stream, 1);
>> + v4l2_device_call_all(v4l2->v4l2_dev, 0, video, s_stream, 1);
>> }
>> v4l2->streaming_users++;
>> @@ -1157,7 +1165,7 @@ static void em28xx_stop_streaming(struct
>> vb2_queue *vq)
>> if (v4l2->streaming_users-- == 1) {
>> /* Disable video stream at TV decoder */
>> - v4l2_device_call_all(&v4l2->v4l2_dev, 0, video, s_stream, 0);
>> + v4l2_device_call_all(v4l2->v4l2_dev, 0, video, s_stream, 0);
>> /* Last active user, so shutdown all the URBS */
>> em28xx_uninit_usb_xfer(dev, EM28XX_ANALOG_MODE);
>> @@ -1192,7 +1200,7 @@ void em28xx_stop_vbi_streaming(struct vb2_queue
>> *vq)
>> if (v4l2->streaming_users-- == 1) {
>> /* Disable video stream at TV decoder */
>> - v4l2_device_call_all(&v4l2->v4l2_dev, 0, video, s_stream, 0);
>> + v4l2_device_call_all(v4l2->v4l2_dev, 0, video, s_stream, 0);
>> /* Last active user, so shutdown all the URBS */
>> em28xx_uninit_usb_xfer(dev, EM28XX_ANALOG_MODE);
>> @@ -1286,7 +1294,7 @@ static int em28xx_vb2_setup(struct em28xx *dev)
>> static void video_mux(struct em28xx *dev, int index)
>> {
>> - struct v4l2_device *v4l2_dev = &dev->v4l2->v4l2_dev;
>> + struct v4l2_device *v4l2_dev = dev->v4l2->v4l2_dev;
>> dev->ctl_input = index;
>> dev->ctl_ainput = INPUT(index)->amux;
>> @@ -1565,7 +1573,7 @@ static int vidioc_querystd(struct file *file,
>> void *priv, v4l2_std_id *norm)
>> {
>> struct em28xx *dev = video_drvdata(file);
>> - v4l2_device_call_all(&dev->v4l2->v4l2_dev, 0, video, querystd,
>> norm);
>> + v4l2_device_call_all(dev->v4l2->v4l2_dev, 0, video, querystd, norm);
>> return 0;
>> }
>> @@ -1596,7 +1604,7 @@ static int vidioc_s_std(struct file *file, void
>> *priv, v4l2_std_id norm)
>> &v4l2->hscale, &v4l2->vscale);
>> em28xx_resolution_set(dev);
>> - v4l2_device_call_all(&v4l2->v4l2_dev, 0, video, s_std, v4l2->norm);
>> + v4l2_device_call_all(v4l2->v4l2_dev, 0, video, s_std, v4l2->norm);
>> return 0;
>> }
>> @@ -1616,7 +1624,7 @@ static int vidioc_g_parm(struct file *file, void
>> *priv,
>> p->parm.capture.readbuffers = EM28XX_MIN_BUF;
>> p->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
>> if (dev->is_webcam) {
>> - rc = v4l2_device_call_until_err(&v4l2->v4l2_dev, 0,
>> + rc = v4l2_device_call_until_err(v4l2->v4l2_dev, 0,
>> video, g_frame_interval, &ival);
>> if (!rc)
>> p->parm.capture.timeperframe = ival.interval;
>> @@ -1648,7 +1656,7 @@ static int vidioc_s_parm(struct file *file, void
>> *priv,
>> memset(&p->parm, 0, sizeof(p->parm));
>> p->parm.capture.readbuffers = EM28XX_MIN_BUF;
>> p->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
>> - rc = v4l2_device_call_until_err(&dev->v4l2->v4l2_dev, 0,
>> + rc = v4l2_device_call_until_err(dev->v4l2->v4l2_dev, 0,
>> video, s_frame_interval, &ival);
>> if (!rc)
>> p->parm.capture.timeperframe = ival.interval;
>> @@ -1675,7 +1683,7 @@ static int vidioc_enum_input(struct file *file,
>> void *priv,
>> if (INPUT(n)->type == EM28XX_VMUX_TELEVISION)
>> i->type = V4L2_INPUT_TYPE_TUNER;
>> - i->std = dev->v4l2->vdev.tvnorms;
>> + i->std = dev->v4l2->vdev->tvnorms;
>> /* webcams do not have the STD API */
>> if (dev->is_webcam)
>> i->capabilities = 0;
>> @@ -1839,7 +1847,7 @@ static int vidioc_g_tuner(struct file *file,
>> void *priv,
>> strscpy(t->name, "Tuner", sizeof(t->name));
>> - v4l2_device_call_all(&dev->v4l2->v4l2_dev, 0, tuner, g_tuner, t);
>> + v4l2_device_call_all(dev->v4l2->v4l2_dev, 0, tuner, g_tuner, t);
>> return 0;
>> }
>> @@ -1851,7 +1859,7 @@ static int vidioc_s_tuner(struct file *file,
>> void *priv,
>> if (t->index != 0)
>> return -EINVAL;
>> - v4l2_device_call_all(&dev->v4l2->v4l2_dev, 0, tuner, s_tuner, t);
>> + v4l2_device_call_all(dev->v4l2->v4l2_dev, 0, tuner, s_tuner, t);
>> return 0;
>> }
>> @@ -1878,8 +1886,8 @@ static int vidioc_s_frequency(struct file *file,
>> void *priv,
>> if (f->tuner != 0)
>> return -EINVAL;
>> - v4l2_device_call_all(&v4l2->v4l2_dev, 0, tuner, s_frequency, f);
>> - v4l2_device_call_all(&v4l2->v4l2_dev, 0, tuner, g_frequency,
>> &new_freq);
>> + v4l2_device_call_all(v4l2->v4l2_dev, 0, tuner, s_frequency, f);
>> + v4l2_device_call_all(v4l2->v4l2_dev, 0, tuner, g_frequency,
>> &new_freq);
>> v4l2->frequency = new_freq.frequency;
>> return 0;
>> @@ -1897,7 +1905,7 @@ static int vidioc_g_chip_info(struct file *file,
>> void *priv,
>> strscpy(chip->name, "ac97", sizeof(chip->name));
>> else
>> strscpy(chip->name,
>> - dev->v4l2->v4l2_dev.name, sizeof(chip->name));
>> + dev->v4l2->v4l2_dev->name, sizeof(chip->name));
>> return 0;
>> }
>> @@ -2095,7 +2103,7 @@ static int radio_g_tuner(struct file *file, void
>> *priv,
>> strscpy(t->name, "Radio", sizeof(t->name));
>> - v4l2_device_call_all(&dev->v4l2->v4l2_dev, 0, tuner, g_tuner, t);
>> + v4l2_device_call_all(dev->v4l2->v4l2_dev, 0, tuner, g_tuner, t);
>> return 0;
>> }
>> @@ -2108,7 +2116,7 @@ static int radio_s_tuner(struct file *file, void
>> *priv,
>> if (t->index != 0)
>> return -EINVAL;
>> - v4l2_device_call_all(&dev->v4l2->v4l2_dev, 0, tuner, s_tuner, t);
>> + v4l2_device_call_all(dev->v4l2->v4l2_dev, 0, tuner, s_tuner, t);
>> return 0;
>> }
>> @@ -2160,6 +2168,11 @@ static int em28xx_v4l2_open(struct file *filp)
>> if (mutex_lock_interruptible(&dev->lock))
>> return -ERESTARTSYS;
>> + if (!dev->v4l2) {
>> + mutex_unlock(&dev->lock);
>> + return -ENODEV;
>> + }
>> +
>> ret = v4l2_fh_open(filp);
>> if (ret) {
>> dev_err(&dev->intf->dev,
>> @@ -2184,7 +2197,7 @@ static int em28xx_v4l2_open(struct file *filp)
>> if (vdev->vfl_type == VFL_TYPE_RADIO) {
>> em28xx_videodbg("video_open: setting radio device\n");
>> - v4l2_device_call_all(&v4l2->v4l2_dev, 0, tuner, s_radio);
>> + v4l2_device_call_all(v4l2->v4l2_dev, 0, tuner, s_radio);
>> }
>> kref_get(&dev->ref);
>> @@ -2222,7 +2235,7 @@ static int em28xx_v4l2_fini(struct em28xx *dev)
>> mutex_lock(&dev->lock);
>> - v4l2_device_disconnect(&v4l2->v4l2_dev);
>> + v4l2_device_disconnect(v4l2->v4l2_dev);
>> em28xx_uninit_usb_xfer(dev, EM28XX_ANALOG_MODE);
>> @@ -2238,14 +2251,15 @@ static int em28xx_v4l2_fini(struct em28xx *dev)
>> video_device_node_name(&v4l2->vbi_dev));
>> video_unregister_device(&v4l2->vbi_dev);
>> }
>> - if (video_is_registered(&v4l2->vdev)) {
>> + if (video_is_registered(v4l2->vdev)) {
>> dev_info(&dev->intf->dev, "V4L2 device %s deregistered\n",
>> - video_device_node_name(&v4l2->vdev));
>> - video_unregister_device(&v4l2->vdev);
>> + video_device_node_name(v4l2->vdev));
>> + video_unregister_device(v4l2->vdev);
>> }
>> v4l2_ctrl_handler_free(&v4l2->ctrl_handler);
>> - v4l2_device_unregister(&v4l2->v4l2_dev);
>> + v4l2_device_unregister(v4l2->v4l2_dev);
>> + v4l2_device_put(v4l2->v4l2_dev);
>> kref_put(&v4l2->ref, em28xx_free_v4l2);
>> @@ -2305,7 +2319,7 @@ static int em28xx_v4l2_close(struct file *filp)
>> goto exit;
>> /* Save some power by putting tuner to sleep */
>> - v4l2_device_call_all(&v4l2->v4l2_dev, 0, tuner, standby);
>> + v4l2_device_call_all(v4l2->v4l2_dev, 0, tuner, standby);
>> /* do this before setting alternate! */
>> em28xx_set_mode(dev, EM28XX_SUSPEND);
>> @@ -2330,6 +2344,17 @@ static int em28xx_v4l2_close(struct file *filp)
>> return 0;
>> }
>> +void em28xx_vdev_release(struct video_device *vdev)
>> +{
>> +#ifdef CONFIG_MEDIA_CONTROLLER
>> + int i;
>> +
>> + for (i = 0; i < vdev->entity.num_pads; i++)
>> + kfree(&vdev->entity.pads[i]);
>> +#endif
>> + kfree(vdev);
>> +}
>> +
>> static const struct v4l2_file_operations em28xx_v4l_fops = {
>> .owner = THIS_MODULE,
>> .open = em28xx_v4l2_open,
>> @@ -2387,7 +2412,7 @@ static const struct v4l2_ioctl_ops
>> video_ioctl_ops = {
>> static const struct video_device em28xx_video_template = {
>> .fops = &em28xx_v4l_fops,
>> .ioctl_ops = &video_ioctl_ops,
>> - .release = video_device_release_empty,
>> + .release = em28xx_vdev_release,
>> .tvnorms = V4L2_STD_ALL,
>> };
>> @@ -2445,7 +2470,7 @@ static void em28xx_vdev_init(struct em28xx *dev,
>> const char *type_name)
>> {
>> *vfd = *template;
>> - vfd->v4l2_dev = &dev->v4l2->v4l2_dev;
>> + vfd->v4l2_dev = dev->v4l2->v4l2_dev;
>> vfd->lock = &dev->lock;
>> if (dev->is_webcam)
>> vfd->tvnorms = 0;
>> @@ -2459,7 +2484,7 @@ static void em28xx_vdev_init(struct em28xx *dev,
>> static void em28xx_tuner_setup(struct em28xx *dev, unsigned short
>> tuner_addr)
>> {
>> struct em28xx_v4l2 *v4l2 = dev->v4l2;
>> - struct v4l2_device *v4l2_dev = &v4l2->v4l2_dev;
>> + struct v4l2_device *v4l2_dev = v4l2->v4l2_dev;
>> struct tuner_setup tun_setup;
>> struct v4l2_frequency f;
>> @@ -2517,6 +2542,11 @@ static void em28xx_tuner_setup(struct em28xx
>> *dev, unsigned short tuner_addr)
>> v4l2_device_call_all(v4l2_dev, 0, tuner, s_frequency, &f);
>> }
>> +void em28xx_v4l2_dev_release(struct v4l2_device *v4l2_dev)
>> +{
>> + kfree(v4l2_dev);
>> +}
>> +
>> static int em28xx_v4l2_init(struct em28xx *dev)
>> {
>> u8 val;
>> @@ -2541,26 +2571,35 @@ static int em28xx_v4l2_init(struct em28xx *dev)
>> v4l2 = kzalloc(sizeof(*v4l2), GFP_KERNEL);
>> if (!v4l2) {
>> - mutex_unlock(&dev->lock);
>> - return -ENOMEM;
>> + ret = -ENOMEM;
>> + goto v4l2_error;
>> }
>> +
>> kref_init(&v4l2->ref);
>> v4l2->dev = dev;
>> dev->v4l2 = v4l2;
>> + v4l2->v4l2_dev = kzalloc(sizeof(*v4l2->v4l2_dev), GFP_KERNEL);
>> + if (!v4l2->v4l2_dev) {
>> + ret = -ENOMEM;
>> + goto v4l2_dev_error;
>> + }
>> +
>> + v4l2->v4l2_dev->release = em28xx_v4l2_dev_release;
>> +
>> #ifdef CONFIG_MEDIA_CONTROLLER
>> - v4l2->v4l2_dev.mdev = dev->media_dev;
>> + v4l2->v4l2_dev->mdev = dev->media_dev;
>> #endif
>> - ret = v4l2_device_register(&dev->intf->dev, &v4l2->v4l2_dev);
>> + ret = v4l2_device_register(&dev->intf->dev, v4l2->v4l2_dev);
>> if (ret < 0) {
>> dev_err(&dev->intf->dev,
>> "Call to v4l2_device_register() failed!\n");
>> - goto err;
>> + goto v4l2_device_register_error;
>> }
>> hdl = &v4l2->ctrl_handler;
>> v4l2_ctrl_handler_init(hdl, 8);
>> - v4l2->v4l2_dev.ctrl_handler = hdl;
>> + v4l2->v4l2_dev->ctrl_handler = hdl;
>> if (dev->is_webcam)
>> v4l2->progressive = true;
>> @@ -2575,22 +2614,22 @@ static int em28xx_v4l2_init(struct em28xx *dev)
>> /* request some modules */
>> if (dev->has_msp34xx)
>> - v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
>> + v4l2_i2c_new_subdev(v4l2->v4l2_dev,
>> &dev->i2c_adap[dev->def_i2c_bus],
>> "msp3400", 0, msp3400_addrs);
>> if (dev->board.decoder == EM28XX_SAA711X)
>> - v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
>> + v4l2_i2c_new_subdev(v4l2->v4l2_dev,
>> &dev->i2c_adap[dev->def_i2c_bus],
>> "saa7115_auto", 0, saa711x_addrs);
>> if (dev->board.decoder == EM28XX_TVP5150)
>> - v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
>> + v4l2_i2c_new_subdev(v4l2->v4l2_dev,
>> &dev->i2c_adap[dev->def_i2c_bus],
>> "tvp5150", 0, tvp5150_addrs);
>> if (dev->board.adecoder == EM28XX_TVAUDIO)
>> - v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
>> + v4l2_i2c_new_subdev(v4l2->v4l2_dev,
>> &dev->i2c_adap[dev->def_i2c_bus],
>> "tvaudio", dev->board.tvaudio_addr, NULL);
>> @@ -2601,13 +2640,13 @@ static int em28xx_v4l2_init(struct em28xx *dev)
>> int has_demod = (dev->board.tda9887_conf & TDA9887_PRESENT);
>> if (dev->board.radio.type)
>> - v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
>> + v4l2_i2c_new_subdev(v4l2->v4l2_dev,
>> &dev->i2c_adap[dev->def_i2c_bus],
>> "tuner", dev->board.radio_addr,
>> NULL);
>
> Add null check for v4l2_i2c_new_subdev() and error handling. It was okay
> check error prior to this change to allocating v4l2_dev. Now this has
> to be handled as a error leg.
I will add to all bellow.
>
>> if (has_demod)
>> - v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
>> + v4l2_i2c_new_subdev(v4l2->v4l2_dev,
>> &dev->i2c_adap[dev->def_i2c_bus],
>> "tuner", 0,
>> v4l2_i2c_tuner_addrs(ADDRS_DEMOD));
>
> Same here:
>
> Add null check for v4l2_i2c_new_subdev() and error handling. It was okay
> check error prior to this change to allocating v4l2_dev. Now this has
> to be handled as a error leg.
>
>> @@ -2616,7 +2655,7 @@ static int em28xx_v4l2_init(struct em28xx *dev)
>> has_demod ? ADDRS_TV_WITH_DEMOD : ADDRS_TV;
>> struct v4l2_subdev *sd;
>> - sd = v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
>> + sd = v4l2_i2c_new_subdev(v4l2->v4l2_dev,
>> &dev->i2c_adap[dev->def_i2c_bus],
>> "tuner", 0,
>> v4l2_i2c_tuner_addrs(type));
>> @@ -2624,7 +2663,7 @@ static int em28xx_v4l2_init(struct em28xx *dev)
>> if (sd)
>> tuner_addr = v4l2_i2c_subdev_addr(sd);
>
> Add null check for v4l2_i2c_new_subdev() and error handling. It was okay
> check error prior to this change to allocating v4l2_dev. Now this has
> to be handled as a error leg.
>
>> } else {
>> - v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
>> + v4l2_i2c_new_subdev(v4l2->v4l2_dev,
>> &dev->i2c_adap[dev->def_i2c_bus],
>> "tuner", tuner_addr, NULL);
>
> Add null check for v4l2_i2c_new_subdev() and error handling. It was okay
> check error prior to this change to allocating v4l2_dev. Now this has
> to be handled as a error leg.
>
>> }
>> @@ -2686,7 +2725,7 @@ static int em28xx_v4l2_init(struct em28xx *dev)
>> /* set default norm */
>> v4l2->norm = V4L2_STD_PAL;
>> - v4l2_device_call_all(&v4l2->v4l2_dev, 0, video, s_std, v4l2->norm);
>> + v4l2_device_call_all(v4l2->v4l2_dev, 0, video, s_std, v4l2->norm);
>> v4l2->interlaced_fieldmode = EM28XX_INTERLACED_DEFAULT;
>> /* Analog specific initialization */
>> @@ -2756,40 +2795,45 @@ static int em28xx_v4l2_init(struct em28xx *dev)
>> goto unregister_dev;
>> /* allocate and fill video video_device struct */
>> - em28xx_vdev_init(dev, &v4l2->vdev, &em28xx_video_template, "video");
>> + v4l2->vdev = kzalloc(sizeof(*v4l2->vdev), GFP_KERNEL);
>> + if (!v4l2->vdev) {
>> + ret = -ENOMEM;
>> + goto unregister_dev;
>> + }
>> +
>> + em28xx_vdev_init(dev, v4l2->vdev, &em28xx_video_template, "video");
>> mutex_init(&v4l2->vb_queue_lock);
>> mutex_init(&v4l2->vb_vbi_queue_lock);
>> - v4l2->vdev.queue = &v4l2->vb_vidq;
>> - v4l2->vdev.queue->lock = &v4l2->vb_queue_lock;
>> - v4l2->vdev.device_caps = V4L2_CAP_READWRITE |
>> V4L2_CAP_VIDEO_CAPTURE |
>> + v4l2->vdev->queue = &v4l2->vb_vidq;
>> + v4l2->vdev->queue->lock = &v4l2->vb_queue_lock;
>> + v4l2->vdev->device_caps = V4L2_CAP_READWRITE |
>> V4L2_CAP_VIDEO_CAPTURE |
>> V4L2_CAP_STREAMING;
>> if (dev->int_audio_type != EM28XX_INT_AUDIO_NONE)
>> - v4l2->vdev.device_caps |= V4L2_CAP_AUDIO;
>> + v4l2->vdev->device_caps |= V4L2_CAP_AUDIO;
>> if (dev->tuner_type != TUNER_ABSENT)
>> - v4l2->vdev.device_caps |= V4L2_CAP_TUNER;
>> -
>> + v4l2->vdev->device_caps |= V4L2_CAP_TUNER;
>> /* disable inapplicable ioctls */
>> if (dev->is_webcam) {
>> - v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_QUERYSTD);
>> - v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_G_STD);
>> - v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_S_STD);
>> + v4l2_disable_ioctl(v4l2->vdev, VIDIOC_QUERYSTD);
>> + v4l2_disable_ioctl(v4l2->vdev, VIDIOC_G_STD);
>> + v4l2_disable_ioctl(v4l2->vdev, VIDIOC_S_STD);
>> } else {
>> - v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_S_PARM);
>> + v4l2_disable_ioctl(v4l2->vdev, VIDIOC_S_PARM);
>> }
>> if (dev->tuner_type == TUNER_ABSENT) {
>> - v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_G_TUNER);
>> - v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_S_TUNER);
>> - v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_G_FREQUENCY);
>> - v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_S_FREQUENCY);
>> + v4l2_disable_ioctl(v4l2->vdev, VIDIOC_G_TUNER);
>> + v4l2_disable_ioctl(v4l2->vdev, VIDIOC_S_TUNER);
>> + v4l2_disable_ioctl(v4l2->vdev, VIDIOC_G_FREQUENCY);
>> + v4l2_disable_ioctl(v4l2->vdev, VIDIOC_S_FREQUENCY);
>> }
>> if (dev->int_audio_type == EM28XX_INT_AUDIO_NONE) {
>> - v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_G_AUDIO);
>> - v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_S_AUDIO);
>> + v4l2_disable_ioctl(v4l2->vdev, VIDIOC_G_AUDIO);
>> + v4l2_disable_ioctl(v4l2->vdev, VIDIOC_S_AUDIO);
>> }
>> /* register v4l2 video video_device */
>> - ret = video_register_device(&v4l2->vdev, VFL_TYPE_VIDEO,
>> + ret = video_register_device(v4l2->vdev, VFL_TYPE_VIDEO,
>> video_nr[dev->devno]);
>> if (ret) {
>> dev_err(&dev->intf->dev,
>> @@ -2863,7 +2907,7 @@ static int em28xx_v4l2_init(struct em28xx *dev)
>> dev_info(&dev->intf->dev,
>> "V4L2 video device registered as %s\n",
>> - video_device_node_name(&v4l2->vdev));
>> + video_device_node_name(v4l2->vdev));
>> if (video_is_registered(&v4l2->vbi_dev))
>> dev_info(&dev->intf->dev,
>> @@ -2871,7 +2915,7 @@ static int em28xx_v4l2_init(struct em28xx *dev)
>> video_device_node_name(&v4l2->vbi_dev));
>> /* Save some power by putting tuner to sleep */
>> - v4l2_device_call_all(&v4l2->v4l2_dev, 0, tuner, standby);
>> + v4l2_device_call_all(v4l2->v4l2_dev, 0, tuner, standby);
>> /* initialize videobuf2 stuff */
>> em28xx_vb2_setup(dev);
>> @@ -2897,18 +2941,22 @@ static int em28xx_v4l2_init(struct em28xx *dev)
>> video_device_node_name(&v4l2->vbi_dev));
>> video_unregister_device(&v4l2->vbi_dev);
>> }
>> - if (video_is_registered(&v4l2->vdev)) {
>> + if (video_is_registered(v4l2->vdev)) {
>> dev_info(&dev->intf->dev,
>> "V4L2 device %s deregistered\n",
>> - video_device_node_name(&v4l2->vdev));
>> - video_unregister_device(&v4l2->vdev);
>> + video_device_node_name(v4l2->vdev));
>> + video_unregister_device(v4l2->vdev);
>> }
>> v4l2_ctrl_handler_free(&v4l2->ctrl_handler);
>> - v4l2_device_unregister(&v4l2->v4l2_dev);
>> -err:
>> + v4l2_device_unregister(v4l2->v4l2_dev);
>> +
>> +v4l2_device_register_error:
>> + v4l2_device_put(v4l2->v4l2_dev);
>> +v4l2_dev_error:
>> dev->v4l2 = NULL;
>> kref_put(&v4l2->ref, em28xx_free_v4l2);
>> +v4l2_error:
>> mutex_unlock(&dev->lock);
>> return ret;
>> }
>> diff --git a/drivers/media/usb/em28xx/em28xx.h
>> b/drivers/media/usb/em28xx/em28xx.h
>> index 6648e11f1271..dbcc297b5a0d 100644
>> --- a/drivers/media/usb/em28xx/em28xx.h
>> +++ b/drivers/media/usb/em28xx/em28xx.h
>> @@ -552,10 +552,10 @@ struct em28xx_v4l2 {
>> struct kref ref;
>> struct em28xx *dev;
>> - struct v4l2_device v4l2_dev;
>> + struct v4l2_device *v4l2_dev;
>> struct v4l2_ctrl_handler ctrl_handler;
>> - struct video_device vdev;
>> + struct video_device *vdev;
>> struct video_device vbi_dev;
>> struct video_device radio_dev;
>> @@ -601,7 +601,7 @@ struct em28xx_v4l2 {
>> unsigned int field_count;
>> #ifdef CONFIG_MEDIA_CONTROLLER
>> - struct media_pad video_pad, vbi_pad;
>> + struct media_pad *video_pad, vbi_pad;
>> struct media_entity *decoder;
>> #endif
>> };
>>
>
> thanks,
> -- Shuah
Thanks,
---
Igor Matheus Andrade Torrente
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