linux-kernel - Re: [PATCH] drm: bridge: it66121: Fix invalid connector dereference

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Message-ID: <6fd4-64ecbf00-7-213b7840@157890373>
Date:   Mon, 28 Aug 2023 16:35:36 +0100
From:   "Helen Mae Koike Fornazier" <helen.koike@...labora.com>
To:     "Jai Luthra" <j-luthra@...com>
Cc:     "Phong LE" <ple@...libre.com>,
        "Neil Armstrong" <neil.armstrong@...aro.org>,
        "Andrzej Hajda" <andrzej.hajda@...el.com>,
        "Robert Foss" <rfoss@...nel.org>,
        "Laurent Pinchart" <Laurent.pinchart@...asonboard.com>,
        "Jonas Karlman" <jonas@...boo.se>,
        "Jernej Skrabec" <jernej.skrabec@...il.com>,
        "David Airlie" <airlied@...il.com>,
        "Daniel Vetter" <daniel@...ll.ch>,
        "Nicolas Belin" <nbelin@...libre.com>,
        Andy.Hsieh <Andy.Hsieh@...iatek.com>, nm@...com,
        "Aradhya Bhatia" <a-bhatia1@...com>, devarsht@...com,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] drm: bridge: it66121: Fix invalid connector dereference

On Friday, August 25, 2023 08:02 -03, Jai Luthra <j-luthra@...com> wrote:

> Fix the NULL pointer dereference when no monitor is connected, and the
> sound card is opened from userspace.
> 
> Instead return an error as EDID information cannot be provided to
> the sound framework if there is no connector attached.
> 
> Fixes: e0fd83dbe924 ("drm: bridge: it66121: Add audio support")
> Reported-by: Nishanth Menon <nm@...com>
> Closes: https://lore.kernel.org/all/20230825105849.crhon42qndxqif4i@gondola/
> Signed-off-by: Jai Luthra <j-luthra@...com>

Reviewed-by: Helen Koike <helen.koike@...labora.com>

> ---
>  drivers/gpu/drm/bridge/ite-it66121.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/gpu/drm/bridge/ite-it66121.c b/drivers/gpu/drm/bridge/ite-it66121.c
> index 466641c77fe9..d6fa00dea464 100644
> --- a/drivers/gpu/drm/bridge/ite-it66121.c
> +++ b/drivers/gpu/drm/bridge/ite-it66121.c
> @@ -1446,6 +1446,11 @@ static int it66121_audio_get_eld(struct device *dev, void *data,
>  {
>  	struct it66121_ctx *ctx = dev_get_drvdata(dev);
>  
> +	if (!ctx->connector) {
> +		dev_dbg(dev, "No connector present, cannot provide EDID data");
> +		return -EINVAL;
> +	}
> +
>  	mutex_lock(&ctx->lock);
>  
>  	memcpy(buf, ctx->connector->eld,
> 
> ---
> base-commit: 6269320850097903b30be8f07a5c61d9f7592393
> change-id: 20230825-it66121_edid-6ee98517808b
> 
> Best regards,
> -- 
> Jai Luthra <j-luthra@...com>
>