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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 deregistration of v4l2 subsystem, the 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. Reported-by: kernel test robot Reported-and-tested-by: syzbot+b2391895514ed9ef4a8e@syzkaller.appspotmail.com Signed-off-by: Igor Matheus Andrade Torrente --- V2: Add v4l2_i2c_new_subdev null check Deal with v4l2 subdevs dependencies V3: Fix link error when compiled as a module --- drivers/media/usb/em28xx/em28xx-camera.c | 4 +- drivers/media/usb/em28xx/em28xx-video.c | 300 +++++++++++++++-------- drivers/media/usb/em28xx/em28xx.h | 6 +- 3 files changed, 209 insertions(+), 101 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..85dfd80fddfb 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, @@ -2184,9 +2197,10 @@ 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); } + v4l2_device_get(v4l2->v4l2_dev); kref_get(&dev->ref); kref_get(&v4l2->ref); v4l2->users++; @@ -2222,7 +2236,7 @@ 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 +2252,15 @@ 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_disconnect(v4l2->v4l2_dev); + v4l2_device_put(v4l2->v4l2_dev); kref_put(&v4l2->ref, em28xx_free_v4l2); @@ -2305,7 +2320,7 @@ 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); @@ -2322,6 +2337,7 @@ static int em28xx_v4l2_close(struct file *filp) } exit: + v4l2_device_put(v4l2->v4l2_dev); v4l2->users--; kref_put(&v4l2->ref, em28xx_free_v4l2); mutex_unlock(&dev->lock); @@ -2330,6 +2346,17 @@ static int em28xx_v4l2_close(struct file *filp) return 0; } +static 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 +2414,7 @@ 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 +2472,7 @@ 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 +2486,7 @@ 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 +2544,22 @@ static void em28xx_tuner_setup(struct em28xx *dev, unsigned short tuner_addr) v4l2_device_call_all(v4l2_dev, 0, tuner, s_frequency, &f); } +static void em28xx_v4l2_dev_release(struct v4l2_device *v4l2_dev) +{ + struct v4l2_subdev *sd, *next; + struct i2c_client *client; + + list_for_each_entry_safe(sd, next, &v4l2_dev->subdevs, list) { + v4l2_device_unregister_subdev(sd); + client = sd->dev_priv; + if (client && !client->dev.of_node && !client->dev.fwnode && + sd->flags & V4L2_SUBDEV_FL_IS_I2C) + i2c_unregister_device(client); + } + + kfree(v4l2_dev); +} + static int em28xx_v4l2_init(struct em28xx *dev) { u8 val; @@ -2524,6 +2567,7 @@ static int em28xx_v4l2_init(struct em28xx *dev) unsigned int maxw; struct v4l2_ctrl_handler *hdl; struct em28xx_v4l2 *v4l2; + struct v4l2_subdev *sd; if (dev->is_audio_only) { /* Shouldn't initialize IR for this interface */ @@ -2541,26 +2585,35 @@ 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; @@ -2574,25 +2627,49 @@ static int em28xx_v4l2_init(struct em28xx *dev) /* request some modules */ - if (dev->has_msp34xx) - v4l2_i2c_new_subdev(&v4l2->v4l2_dev, - &dev->i2c_adap[dev->def_i2c_bus], - "msp3400", 0, msp3400_addrs); + if (dev->has_msp34xx) { + sd = v4l2_i2c_new_subdev(v4l2->v4l2_dev, + &dev->i2c_adap[dev->def_i2c_bus], + "msp3400", 0, msp3400_addrs); + if (!sd) { + dev_err(&dev->intf->dev, + "Error while registering msp34xx v4l2 subdevice!\n"); + goto v4l2_subdev_register_error; + } + } - if (dev->board.decoder == EM28XX_SAA711X) - v4l2_i2c_new_subdev(&v4l2->v4l2_dev, - &dev->i2c_adap[dev->def_i2c_bus], - "saa7115_auto", 0, saa711x_addrs); + if (dev->board.decoder == EM28XX_SAA711X) { + sd = v4l2_i2c_new_subdev(v4l2->v4l2_dev, + &dev->i2c_adap[dev->def_i2c_bus], + "saa7115_auto", 0, saa711x_addrs); + if (!sd) { + dev_err(&dev->intf->dev, + "Error while registering EM28XX_SAA711X v4l2 subdevice!\n"); + goto v4l2_subdev_register_error; + } + } - if (dev->board.decoder == EM28XX_TVP5150) - v4l2_i2c_new_subdev(&v4l2->v4l2_dev, - &dev->i2c_adap[dev->def_i2c_bus], - "tvp5150", 0, tvp5150_addrs); + if (dev->board.decoder == EM28XX_TVP5150) { + sd = v4l2_i2c_new_subdev(v4l2->v4l2_dev, + &dev->i2c_adap[dev->def_i2c_bus], + "tvp5150", 0, tvp5150_addrs); + if (!sd) { + dev_err(&dev->intf->dev, + "Error while registering EM28XX_TVP5150 v4l2 subdevice!\n"); + goto v4l2_subdev_register_error; + } + } - if (dev->board.adecoder == EM28XX_TVAUDIO) - v4l2_i2c_new_subdev(&v4l2->v4l2_dev, - &dev->i2c_adap[dev->def_i2c_bus], - "tvaudio", dev->board.tvaudio_addr, NULL); + if (dev->board.adecoder == EM28XX_TVAUDIO) { + sd = v4l2_i2c_new_subdev(v4l2->v4l2_dev, + &dev->i2c_adap[dev->def_i2c_bus], + "tvaudio", dev->board.tvaudio_addr, NULL); + if (!sd) { + dev_err(&dev->intf->dev, + "Error while registering EM28XX_TVAUDIO v4l2 subdevice!\n"); + goto v4l2_subdev_register_error; + } + } /* Initialize tuner and camera */ @@ -2600,33 +2677,55 @@ static int em28xx_v4l2_init(struct em28xx *dev) unsigned short tuner_addr = dev->board.tuner_addr; int has_demod = (dev->board.tda9887_conf & TDA9887_PRESENT); - if (dev->board.radio.type) - v4l2_i2c_new_subdev(&v4l2->v4l2_dev, - &dev->i2c_adap[dev->def_i2c_bus], - "tuner", dev->board.radio_addr, - NULL); - - if (has_demod) - v4l2_i2c_new_subdev(&v4l2->v4l2_dev, - &dev->i2c_adap[dev->def_i2c_bus], - "tuner", 0, - v4l2_i2c_tuner_addrs(ADDRS_DEMOD)); + if (dev->board.radio.type) { + sd = v4l2_i2c_new_subdev(v4l2->v4l2_dev, + &dev->i2c_adap[dev->def_i2c_bus], + "tuner", dev->board.radio_addr, + NULL); + if (!sd) { + dev_err(&dev->intf->dev, + "Error while registering v4l2 subdevice!\n"); + goto v4l2_subdev_register_error; + } + } + + if (has_demod) { + sd = v4l2_i2c_new_subdev(v4l2->v4l2_dev, + &dev->i2c_adap[dev->def_i2c_bus], + "tuner", 0, + v4l2_i2c_tuner_addrs(ADDRS_DEMOD)); + if (!sd) { + dev_err(&dev->intf->dev, + "Error while registering v4l2 subdevice!\n"); + goto v4l2_subdev_register_error; + } + } + if (tuner_addr == 0) { enum v4l2_i2c_tuner_type type = 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)); - - if (sd) + if (sd) { tuner_addr = v4l2_i2c_subdev_addr(sd); + } else { + dev_err(&dev->intf->dev, + "Error while registering v4l2 subdevice!\n"); + goto v4l2_subdev_register_error; + } + } else { - v4l2_i2c_new_subdev(&v4l2->v4l2_dev, - &dev->i2c_adap[dev->def_i2c_bus], - "tuner", tuner_addr, NULL); + sd = v4l2_i2c_new_subdev(v4l2->v4l2_dev, + &dev->i2c_adap[dev->def_i2c_bus], + "tuner", tuner_addr, NULL); + if (!sd) { + dev_err(&dev->intf->dev, + "Error while registering v4l2 subdevice!\n"); + goto v4l2_subdev_register_error; + } } em28xx_tuner_setup(dev, tuner_addr); @@ -2686,7 +2785,7 @@ 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 +2855,45 @@ 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 +2967,7 @@ 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 +2975,7 @@ 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 +3001,22 @@ 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_subdev_register_error: + v4l2_device_disconnect(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 }; -- 2.20.1 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.5 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 335A5C43460 for ; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-kernel-mentees-bounces@lists.linuxfoundation.org Sender: "Linux-kernel-mentees" 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 deregistration of v4l2 subsystem, the 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. Reported-by: kernel test robot Reported-and-tested-by: syzbot+b2391895514ed9ef4a8e@syzkaller.appspotmail.com Signed-off-by: Igor Matheus Andrade Torrente --- V2: Add v4l2_i2c_new_subdev null check Deal with v4l2 subdevs dependencies V3: Fix link error when compiled as a module --- drivers/media/usb/em28xx/em28xx-camera.c | 4 +- drivers/media/usb/em28xx/em28xx-video.c | 300 +++++++++++++++-------- drivers/media/usb/em28xx/em28xx.h | 6 +- 3 files changed, 209 insertions(+), 101 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..85dfd80fddfb 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, @@ -2184,9 +2197,10 @@ 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); } + v4l2_device_get(v4l2->v4l2_dev); kref_get(&dev->ref); kref_get(&v4l2->ref); v4l2->users++; @@ -2222,7 +2236,7 @@ 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 +2252,15 @@ 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_disconnect(v4l2->v4l2_dev); + v4l2_device_put(v4l2->v4l2_dev); kref_put(&v4l2->ref, em28xx_free_v4l2); @@ -2305,7 +2320,7 @@ 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); @@ -2322,6 +2337,7 @@ static int em28xx_v4l2_close(struct file *filp) } exit: + v4l2_device_put(v4l2->v4l2_dev); v4l2->users--; kref_put(&v4l2->ref, em28xx_free_v4l2); mutex_unlock(&dev->lock); @@ -2330,6 +2346,17 @@ static int em28xx_v4l2_close(struct file *filp) return 0; } +static 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 +2414,7 @@ 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 +2472,7 @@ 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 +2486,7 @@ 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 +2544,22 @@ static void em28xx_tuner_setup(struct em28xx *dev, unsigned short tuner_addr) v4l2_device_call_all(v4l2_dev, 0, tuner, s_frequency, &f); } +static void em28xx_v4l2_dev_release(struct v4l2_device *v4l2_dev) +{ + struct v4l2_subdev *sd, *next; + struct i2c_client *client; + + list_for_each_entry_safe(sd, next, &v4l2_dev->subdevs, list) { + v4l2_device_unregister_subdev(sd); + client = sd->dev_priv; + if (client && !client->dev.of_node && !client->dev.fwnode && + sd->flags & V4L2_SUBDEV_FL_IS_I2C) + i2c_unregister_device(client); + } + + kfree(v4l2_dev); +} + static int em28xx_v4l2_init(struct em28xx *dev) { u8 val; @@ -2524,6 +2567,7 @@ static int em28xx_v4l2_init(struct em28xx *dev) unsigned int maxw; struct v4l2_ctrl_handler *hdl; struct em28xx_v4l2 *v4l2; + struct v4l2_subdev *sd; if (dev->is_audio_only) { /* Shouldn't initialize IR for this interface */ @@ -2541,26 +2585,35 @@ 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; @@ -2574,25 +2627,49 @@ static int em28xx_v4l2_init(struct em28xx *dev) /* request some modules */ - if (dev->has_msp34xx) - v4l2_i2c_new_subdev(&v4l2->v4l2_dev, - &dev->i2c_adap[dev->def_i2c_bus], - "msp3400", 0, msp3400_addrs); + if (dev->has_msp34xx) { + sd = v4l2_i2c_new_subdev(v4l2->v4l2_dev, + &dev->i2c_adap[dev->def_i2c_bus], + "msp3400", 0, msp3400_addrs); + if (!sd) { + dev_err(&dev->intf->dev, + "Error while registering msp34xx v4l2 subdevice!\n"); + goto v4l2_subdev_register_error; + } + } - if (dev->board.decoder == EM28XX_SAA711X) - v4l2_i2c_new_subdev(&v4l2->v4l2_dev, - &dev->i2c_adap[dev->def_i2c_bus], - "saa7115_auto", 0, saa711x_addrs); + if (dev->board.decoder == EM28XX_SAA711X) { + sd = v4l2_i2c_new_subdev(v4l2->v4l2_dev, + &dev->i2c_adap[dev->def_i2c_bus], + "saa7115_auto", 0, saa711x_addrs); + if (!sd) { + dev_err(&dev->intf->dev, + "Error while registering EM28XX_SAA711X v4l2 subdevice!\n"); + goto v4l2_subdev_register_error; + } + } - if (dev->board.decoder == EM28XX_TVP5150) - v4l2_i2c_new_subdev(&v4l2->v4l2_dev, - &dev->i2c_adap[dev->def_i2c_bus], - "tvp5150", 0, tvp5150_addrs); + if (dev->board.decoder == EM28XX_TVP5150) { + sd = v4l2_i2c_new_subdev(v4l2->v4l2_dev, + &dev->i2c_adap[dev->def_i2c_bus], + "tvp5150", 0, tvp5150_addrs); + if (!sd) { + dev_err(&dev->intf->dev, + "Error while registering EM28XX_TVP5150 v4l2 subdevice!\n"); + goto v4l2_subdev_register_error; + } + } - if (dev->board.adecoder == EM28XX_TVAUDIO) - v4l2_i2c_new_subdev(&v4l2->v4l2_dev, - &dev->i2c_adap[dev->def_i2c_bus], - "tvaudio", dev->board.tvaudio_addr, NULL); + if (dev->board.adecoder == EM28XX_TVAUDIO) { + sd = v4l2_i2c_new_subdev(v4l2->v4l2_dev, + &dev->i2c_adap[dev->def_i2c_bus], + "tvaudio", dev->board.tvaudio_addr, NULL); + if (!sd) { + dev_err(&dev->intf->dev, + "Error while registering EM28XX_TVAUDIO v4l2 subdevice!\n"); + goto v4l2_subdev_register_error; + } + } /* Initialize tuner and camera */ @@ -2600,33 +2677,55 @@ static int em28xx_v4l2_init(struct em28xx *dev) unsigned short tuner_addr = dev->board.tuner_addr; int has_demod = (dev->board.tda9887_conf & TDA9887_PRESENT); - if (dev->board.radio.type) - v4l2_i2c_new_subdev(&v4l2->v4l2_dev, - &dev->i2c_adap[dev->def_i2c_bus], - "tuner", dev->board.radio_addr, - NULL); - - if (has_demod) - v4l2_i2c_new_subdev(&v4l2->v4l2_dev, - &dev->i2c_adap[dev->def_i2c_bus], - "tuner", 0, - v4l2_i2c_tuner_addrs(ADDRS_DEMOD)); + if (dev->board.radio.type) { + sd = v4l2_i2c_new_subdev(v4l2->v4l2_dev, + &dev->i2c_adap[dev->def_i2c_bus], + "tuner", dev->board.radio_addr, + NULL); + if (!sd) { + dev_err(&dev->intf->dev, + "Error while registering v4l2 subdevice!\n"); + goto v4l2_subdev_register_error; + } + } + + if (has_demod) { + sd = v4l2_i2c_new_subdev(v4l2->v4l2_dev, + &dev->i2c_adap[dev->def_i2c_bus], + "tuner", 0, + v4l2_i2c_tuner_addrs(ADDRS_DEMOD)); + if (!sd) { + dev_err(&dev->intf->dev, + "Error while registering v4l2 subdevice!\n"); + goto v4l2_subdev_register_error; + } + } + if (tuner_addr == 0) { enum v4l2_i2c_tuner_type type = 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)); - - if (sd) + if (sd) { tuner_addr = v4l2_i2c_subdev_addr(sd); + } else { + dev_err(&dev->intf->dev, + "Error while registering v4l2 subdevice!\n"); + goto v4l2_subdev_register_error; + } + } else { - v4l2_i2c_new_subdev(&v4l2->v4l2_dev, - &dev->i2c_adap[dev->def_i2c_bus], - "tuner", tuner_addr, NULL); + sd = v4l2_i2c_new_subdev(v4l2->v4l2_dev, + &dev->i2c_adap[dev->def_i2c_bus], + "tuner", tuner_addr, NULL); + if (!sd) { + dev_err(&dev->intf->dev, + "Error while registering v4l2 subdevice!\n"); + goto v4l2_subdev_register_error; + } } em28xx_tuner_setup(dev, tuner_addr); @@ -2686,7 +2785,7 @@ 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 +2855,45 @@ 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 +2967,7 @@ 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 +2975,7 @@ 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 +3001,22 @@ 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_subdev_register_error: + v4l2_device_disconnect(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 }; -- 2.20.1 _______________________________________________ Linux-kernel-mentees mailing list Linux-kernel-mentees@lists.linuxfoundation.org https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees