linux-kernel - Re: [PATCH 1/2] drm/bridge: it66121: Initialize {device,vendor}

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Date:   Tue, 31 Aug 2021 16:22:44 +0200
From:   Robert Foss <robert.foss@...aro.org>
To:     Neil Armstrong <narmstrong@...libre.com>
Cc:     Paul Cercueil <paul@...pouillou.net>, Phong LE <ple@...libre.com>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, list@...ndingux.net,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] drm/bridge: it66121: Initialize {device,vendor}_ids

On Mon, 30 Aug 2021 at 11:40, Neil Armstrong <narmstrong@...libre.com> wrote:
>
> On 27/08/2021 18:39, Paul Cercueil wrote:
> > These two arrays are populated with data read from the I2C device
> > through regmap_read(), and the data is then compared with hardcoded
> > vendor/product ID values of supported chips.
> >
> > However, the return value of regmap_read() was never checked. This is
> > fine, as long as the two arrays are zero-initialized, so that we don't
> > compare the vendor/product IDs against whatever garbage is left on the
> > stack.
> >
> > Address this issue by zero-initializing these two arrays.
> >
>
> Fixes: 988156dc2fc9 ("drm: bridge: add it66121 driver")
>
> > Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> > ---
> >  drivers/gpu/drm/bridge/ite-it66121.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/bridge/ite-it66121.c b/drivers/gpu/drm/bridge/ite-it66121.c
> > index 2f2a09adb4bc..b130d01147c6 100644
> > --- a/drivers/gpu/drm/bridge/ite-it66121.c
> > +++ b/drivers/gpu/drm/bridge/ite-it66121.c
> > @@ -889,7 +889,7 @@ static irqreturn_t it66121_irq_threaded_handler(int irq, void *dev_id)
> >  static int it66121_probe(struct i2c_client *client,
> >                        const struct i2c_device_id *id)
> >  {
> > -     u32 vendor_ids[2], device_ids[2], revision_id;
> > +     u32 revision_id, vendor_ids[2] = { 0 }, device_ids[2] = { 0 };
> >       struct device_node *ep;
> >       int ret;
> >       struct it66121_ctx *ctx;
> >
>
> Reviewed-by: Neil Armstrong <narmstrong@...libre.com>

Applied series to drm-misc-next.