Dear Martin,
Thanks for pointing out my mistake.
I cross-checked other implementations of drivers under media/i2c. I
agree with you. Let me send the second version of my patch.
Thanks,
Wei
On Sun, 26 Mar 2023 at 16:50, Martin Kepplinger <martink@xxxxxxxxx> wrote:
>
> Am Freitag, dem 24.03.2023 um 17:24 +0000 schrieb Wei Chen:
> > hi846_init_controls doesn't clean the allocated ctrl_hdlr
> > in case there is a failure, which causes memleak. Add
> > v4l2_ctrl_handler_free to free the resource properly.
> >
> > Signed-off-by: Wei Chen <harperchen1110@xxxxxxxxx>
> > ---
> > drivers/media/i2c/hi846.c | 1 +
> > 1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/media/i2c/hi846.c b/drivers/media/i2c/hi846.c
> > index 7c61873b7198..c45a6511d2c1 100644
> > --- a/drivers/media/i2c/hi846.c
> > +++ b/drivers/media/i2c/hi846.c
> > @@ -1472,6 +1472,7 @@ static int hi846_init_controls(struct hi846
> > *hi846)
> > if (ctrl_hdlr->error) {
> > dev_err(&client->dev, "v4l ctrl handler error: %d\n",
> > ctrl_hdlr->error);
> > + v4l2_ctrl_handler_free(ctrl_hdlr);
> > return ctrl_hdlr->error;
> > }
> >
>
> hi Wei, thanks for the patch. It looks like I forgot that indeed, but
> to me it looks like the subsequent error paths of
> v4l2_fwnode_device_parse() and v4l2_ctrl_new_fwnode_properties() would
> leak the same thing.
>
> And since we only assign it to the subdev's ctrl_handler in the success
> case later, you could simply add an error label:
>
>
> @@ -1663,21 +1663,26 @@ static int hi846_init_controls(struct hi846
> *hi846)
> if (ctrl_hdlr->error) {
> dev_err(&client->dev, "v4l ctrl handler error: %d\n",
> ctrl_hdlr->error);
> - return ctrl_hdlr->error;
> + ret = ctrl_hdlr->error;
> + goto error;
> }
>
> ret = v4l2_fwnode_device_parse(&client->dev, &props);
> if (ret)
> - return ret;
> + goto error;
>
> ret = v4l2_ctrl_new_fwnode_properties(ctrl_hdlr,
> &hi846_ctrl_ops,
> &props);
> if (ret)
> - return ret;
> + goto error;
>
> hi846->sd.ctrl_handler = ctrl_hdlr;
>
> return 0;
> +
> +error:
> + v4l2_ctrl_handler_free(ctrl_hdlr);
> + return ret;
> }
>
>
> what do you think? thanks!
>
> martin
>
>
