linux-kernel - Re: [Freedreno] [PATCH v2 04/10] drm/msm/hdmi: fix memory corruption with too many bridges

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Date:   Thu, 22 Sep 2022 12:52:36 -0700
From:   Kuogee Hsieh <quic_khsieh@...cinc.com>
To:     Johan Hovold <johan+linaro@...nel.org>,
        Douglas Anderson <dianders@...omium.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        "Rob Clark" <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>
CC:     <dri-devel@...ts.freedesktop.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Daniel Vetter <daniel@...ll.ch>,
        Jonas Karlman <jonas@...boo.se>,
        <linux-arm-msm@...r.kernel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        <freedreno@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Stephen Boyd <swboyd@...omium.org>,
        Robert Foss <robert.foss@...aro.org>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        <stable@...r.kernel.org>, Sean Paul <sean@...rly.run>,
        Steev Klimaszewski <steev@...i.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>
Subject: Re: [Freedreno] [PATCH v2 04/10] drm/msm/hdmi: fix memory corruption
 with too many bridges


On 9/13/2022 1:53 AM, Johan Hovold wrote:
> Add the missing sanity check on the bridge counter to avoid corrupting
> data beyond the fixed-sized bridge array in case there are ever more
> than eight bridges.
>
> Fixes: a3376e3ec81c ("drm/msm: convert to drm_bridge")
> Cc: stable@...r.kernel.org	# 3.12
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
Tested-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
Reviewed-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
> ---
>   drivers/gpu/drm/msm/hdmi/hdmi.c | 5 +++++
>   1 file changed, 5 insertions(+)
>
> diff --git a/drivers/gpu/drm/msm/hdmi/hdmi.c b/drivers/gpu/drm/msm/hdmi/hdmi.c
> index 93fe61b86967..a0ed6aa8e4e1 100644
> --- a/drivers/gpu/drm/msm/hdmi/hdmi.c
> +++ b/drivers/gpu/drm/msm/hdmi/hdmi.c
> @@ -300,6 +300,11 @@ int msm_hdmi_modeset_init(struct hdmi *hdmi,
>   	struct platform_device *pdev = hdmi->pdev;
>   	int ret;
>   
> +	if (priv->num_bridges == ARRAY_SIZE(priv->bridges)) {
> +		DRM_DEV_ERROR(dev->dev, "too many bridges\n");
> +		return -ENOSPC;
> +	}
> +
>   	hdmi->dev = dev;
>   	hdmi->encoder = encoder;
>