From: Sakari Ailus sakari.ailus@linux.intel.com
commit cf7f34777a5b4100a3a44ff95f3d949c62892bdd upstream.
Prevent NULL (or close to NULL) pointer dereference in various places by registering the video device only when the V4L2 m2m framework has been set up.
Fixes: commit 96d8eab5d0a1 ("V4L/DVB: [v5,2/2] v4l: Add a mem-to-mem videobuf framework test device") Signed-off-by: Sakari Ailus sakari.ailus@linux.intel.com Signed-off-by: Hans Verkuil hverkuil-cisco@xs4all.nl Signed-off-by: Mauro Carvalho Chehab mchehab+huawei@kernel.org Signed-off-by: Mark-PK Tsai mark-pk.tsai@mediatek.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/media/platform/vim2m.c | 20 +++++++++++--------- 1 file changed, 11 insertions(+), 9 deletions(-)
--- a/drivers/media/platform/vim2m.c +++ b/drivers/media/platform/vim2m.c @@ -1333,12 +1333,6 @@ static int vim2m_probe(struct platform_d vfd->lock = &dev->dev_mutex; vfd->v4l2_dev = &dev->v4l2_dev;
- ret = video_register_device(vfd, VFL_TYPE_GRABBER, 0); - if (ret) { - v4l2_err(&dev->v4l2_dev, "Failed to register video device\n"); - goto error_v4l2; - } - video_set_drvdata(vfd, dev); v4l2_info(&dev->v4l2_dev, "Device registered as /dev/video%d\n", vfd->num); @@ -1353,6 +1347,12 @@ static int vim2m_probe(struct platform_d goto error_dev; }
+ ret = video_register_device(vfd, VFL_TYPE_GRABBER, 0); + if (ret) { + v4l2_err(&dev->v4l2_dev, "Failed to register video device\n"); + goto error_m2m; + } + #ifdef CONFIG_MEDIA_CONTROLLER dev->mdev.dev = &pdev->dev; strscpy(dev->mdev.model, "vim2m", sizeof(dev->mdev.model)); @@ -1366,7 +1366,7 @@ static int vim2m_probe(struct platform_d MEDIA_ENT_F_PROC_VIDEO_SCALER); if (ret) { v4l2_err(&dev->v4l2_dev, "Failed to init mem2mem media controller\n"); - goto error_dev; + goto error_v4l2; }
ret = media_device_register(&dev->mdev); @@ -1381,11 +1381,13 @@ static int vim2m_probe(struct platform_d error_m2m_mc: v4l2_m2m_unregister_media_controller(dev->m2m_dev); #endif -error_dev: +error_v4l2: video_unregister_device(&dev->vfd); /* vim2m_device_release called by video_unregister_device to release various objects */ return ret; -error_v4l2: +error_m2m: + v4l2_m2m_release(dev->m2m_dev); +error_dev: v4l2_device_unregister(&dev->v4l2_dev); error_free: kfree(dev);