Re: [PATCH 2/6] nvmem: fix memory leak in error path

[Bartosz Golaszewski]

wt., 18 lut 2020 o 10:42 Srinivas Kandagatla
<srinivas.kandagatla@xxxxxxxxxx> napisaÅ(a):
>
>
>
> On 17/02/2020 19:54, Bartosz Golaszewski wrote:
> > From: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
> >
> > We need to remove the ida mapping when returning from nvmem_register()
> > with an error.
> >
> > Signed-off-by: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
> Was too quick in my last reply..
>
> > ---
> >   drivers/nvmem/core.c | 4 +++-
> >   1 file changed, 3 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
> > index ef326f243f36..b0be03d5f240 100644
> > --- a/drivers/nvmem/core.c
> > +++ b/drivers/nvmem/core.c
> > @@ -353,7 +353,7 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
> >               nvmem->wp_gpio = gpiod_get_optional(config->dev, "wp",
> >                                                   GPIOD_OUT_HIGH);
> >       if (IS_ERR(nvmem->wp_gpio))
> > -             return ERR_CAST(nvmem->wp_gpio);
> > +             goto err_ida_remove;
>
> Looks like this is adding  nvmem leak here.
> May be something like this should help:
>
>
> if (IS_ERR(nvmem->wp_gpio)) {
>         rval =  ERR_CAST(nvmem->wp_gpio);
>         ida_simple_remove(&nvmem_ida, nvmem->id);
>         kfree(nvmem);
>         return rval;
>
> }
>

Srinivas,

I just sent a v2 of this series that addresses it as well. Please
don't apply v1 yet.

Bartosz