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

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Date:   Mon, 30 Aug 2021 11:40:54 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Paul Cercueil <paul@...pouillou.net>, Phong LE <ple@...libre.com>
Cc:     Andrzej Hajda <a.hajda@...sung.com>,
        Robert Foss <robert.foss@...aro.org>,
        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@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] drm/bridge: it66121: Initialize {device,vendor}_ids

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>

Thanks,
Neil