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drm/msm/hdmi: fix memory corruption with too many bridges
commit4c1294da6a
upstream. 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:a3376e3ec8
("drm/msm: convert to drm_bridge") Cc: stable@vger.kernel.org # 3.12 Signed-off-by: Johan Hovold <johan+linaro@kernel.org> Tested-by: Kuogee Hsieh <quic_khsieh@quicinc.com> Reviewed-by: Kuogee Hsieh <quic_khsieh@quicinc.com> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Patchwork: https://patchwork.freedesktop.org/patch/502670/ Link: https://lore.kernel.org/r/20220913085320.8577-5-johan+linaro@kernel.org Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -300,6 +300,11 @@ int msm_hdmi_modeset_init(struct hdmi *hdmi,
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struct platform_device *pdev = hdmi->pdev;
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int ret;
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if (priv->num_bridges == ARRAY_SIZE(priv->bridges)) {
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DRM_DEV_ERROR(dev->dev, "too many bridges\n");
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return -ENOSPC;
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}
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hdmi->dev = dev;
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hdmi->encoder = encoder;
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