On Tue, Jan 21, 2020 at 4:23 PM Michael Tretter
<m.tretter@xxxxxxxxxxxxxx> wrote:
>
> On Mon, 13 Jan 2020 13:59:51 +0800, Chuhong Yuan wrote:
> > allegro_open() misses checks for v4l2_m2m_ctx_init() and results of
> > v4l2_ctrl_new* calls.
> > Add checks and error handlers to fix the problems.
> >
> > Signed-off-by: Chuhong Yuan <hslester96@xxxxxxxxx>
> > ---
> > Changes in v3:
> > - Make code cleaner.
> > - Add a check for handler->error.
> >
> > .../staging/media/allegro-dvt/allegro-core.c | 24 +++++++++++++++----
> > 1 file changed, 20 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/staging/media/allegro-dvt/allegro-core.c b/drivers/staging/media/allegro-dvt/allegro-core.c
> > index 6f0cd0784786..e86001e42963 100644
> > --- a/drivers/staging/media/allegro-dvt/allegro-core.c
> > +++ b/drivers/staging/media/allegro-dvt/allegro-core.c
> > @@ -2270,15 +2270,12 @@ static int allegro_open(struct file *file)
> > struct allegro_channel *channel = NULL;
> > struct v4l2_ctrl_handler *handler;
> > u64 mask;
> > + int ret;
> >
> > channel = kzalloc(sizeof(*channel), GFP_KERNEL);
> > if (!channel)
> > return -ENOMEM;
> >
> > - v4l2_fh_init(&channel->fh, vdev);
> > - file->private_data = &channel->fh;
> > - v4l2_fh_add(&channel->fh);
> > -
> > init_completion(&channel->completion);
> >
> > channel->dev = dev;
> > @@ -2328,6 +2325,11 @@ static int allegro_open(struct file *file)
> > V4L2_CID_MIN_BUFFERS_FOR_OUTPUT,
> > 1, 32,
> > 1, 1);
> > + if (handler->error != 0) {
> > + ret = handler->error;
> > + goto error;
> > + }
> > +
> > channel->fh.ctrl_handler = handler;
> >
> > channel->mcu_channel_id = -1;
> > @@ -2341,7 +2343,21 @@ static int allegro_open(struct file *file)
> > channel->fh.m2m_ctx = v4l2_m2m_ctx_init(dev->m2m_dev, channel,
> > allegro_queue_init);
> >
> > + if (IS_ERR(channel->fh.m2m_ctx)) {
> > + ret = PTR_ERR(channel->fh.m2m_ctx);
> > + goto error;
> > + }
> > +
> > + v4l2_fh_init(&channel->fh, vdev);
>
> This call sets channel->fh.ctrl_handler to vdev->ctrl_handler, which
> has previously been overriden by the driver to handler. Therefore, this
> patch breaks all controls. I think we should initialize channel->fh
> before setting any fields of this struct.
>
I'm not very clear about this issue.
In my second version, Hans replied that init could be moved before return 0.
I have sent this mail to him.
> Michael
>
> > + file->private_data = &channel->fh;
> > + v4l2_fh_add(&channel->fh);
> > +
> > return 0;
> > +
> > +error:
> > + v4l2_ctrl_handler_free(handler);
> > + kfree(channel);
> > + return ret;
> > }
> >
> > static int allegro_release(struct file *file)
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