linux-kernel - Re: [PATCH] media: hi846: Fix memleak in hi846_init

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Message-ID: <CAO4mrfdoAcLUH5VyQyskBiZZpqNS-dKMwddwvDfwP=Csw0EgmQ@mail.gmail.com>
Date:   Sun, 26 Mar 2023 17:11:29 +0800
From:   Wei Chen <harperchen1110@...il.com>
To:     Martin Kepplinger <martink@...teo.de>
Cc:     mchehab@...nel.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: hi846: Fix memleak in hi846_init_controls()

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@...teo.de> 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@...il.com>
> > ---
> >  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
>
>