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@xxxxxxxxxxxxxxx>
---
Hi folks,
I haven't thought a lot about this but at least it fixes an oops that
happens at vim2m load time otherwise.
It's a test driver so I guess backporting isn't crucial anyway.
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);
--
2.27.0
