From: Sakari Ailus sakari.ailus@linux.intel.com
stable inclusion from stable-v5.10.119 commit ed0e71cc3f1e57b71a004446cd804b366826dbeb category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I5L6BB
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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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 Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com Acked-by: Xie XiuQi xiexiuqi@huawei.com --- drivers/media/test-drivers/vim2m.c | 20 +++++++++++--------- 1 file changed, 11 insertions(+), 9 deletions(-)
diff --git a/drivers/media/test-drivers/vim2m.c b/drivers/media/test-drivers/vim2m.c index a776bb8e0e09..331a9053a0ed 100644 --- a/drivers/media/test-drivers/vim2m.c +++ b/drivers/media/test-drivers/vim2m.c @@ -1325,12 +1325,6 @@ static int vim2m_probe(struct platform_device *pdev) vfd->lock = &dev->dev_mutex; vfd->v4l2_dev = &dev->v4l2_dev;
- ret = video_register_device(vfd, VFL_TYPE_VIDEO, 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); @@ -1345,6 +1339,12 @@ static int vim2m_probe(struct platform_device *pdev) goto error_dev; }
+ ret = video_register_device(vfd, VFL_TYPE_VIDEO, 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)); @@ -1358,7 +1358,7 @@ static int vim2m_probe(struct platform_device *pdev) 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); @@ -1373,11 +1373,13 @@ static int vim2m_probe(struct platform_device *pdev) 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);