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media: vivid: fix error handling of kthread_run

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kthread_run returns an error pointer, but elsewhere in the code
dev->kthread_vid_cap/out is checked against NULL.

If kthread_run returns an error, then set the pointer to NULL.

I chose this method over changing all kthread_vid_cap/out tests
elsewhere since this is more robust.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Reported-by: syzbot+53d5b2df0d9744411e2e@syzkaller.appspotmail.com
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Hans Verkuil 2018-10-29 06:15:31 -04:00 committed by Mauro Carvalho Chehab
parent da411ab10c
commit 701f49bc02
2 changed files with 8 additions and 2 deletions
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5
drivers/media/platform/vivid/vivid-kthread-cap.c
View file

@ -873,8 +873,11 @@ int vivid_start_generating_vid_cap(struct vivid_dev *dev, bool *pstreaming)
"%s-vid-cap", dev->v4l2_dev.name);
if (IS_ERR(dev->kthread_vid_cap)) {
int err = PTR_ERR(dev->kthread_vid_cap);
dev->kthread_vid_cap = NULL;
v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n");
return PTR_ERR(dev->kthread_vid_cap);
return err;
}
*pstreaming = true;
vivid_grab_controls(dev, true);

5
drivers/media/platform/vivid/vivid-kthread-out.c
View file

@ -244,8 +244,11 @@ int vivid_start_generating_vid_out(struct vivid_dev *dev, bool *pstreaming)
"%s-vid-out", dev->v4l2_dev.name);
if (IS_ERR(dev->kthread_vid_out)) {
int err = PTR_ERR(dev->kthread_vid_out);
dev->kthread_vid_out = NULL;
v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n");
return PTR_ERR(dev->kthread_vid_out);
return err;
}
*pstreaming = true;
vivid_grab_controls(dev, true);