From: Johan Hovold johan+linaro@kernel.org
commit 4c1294da6aed1f16d47a417dcfe6602833c3c95c 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: a3376e3ec81c ("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 --- drivers/gpu/drm/msm/hdmi/hdmi.c | 5 +++++ 1 file changed, 5 insertions(+)
--- a/drivers/gpu/drm/msm/hdmi/hdmi.c +++ b/drivers/gpu/drm/msm/hdmi/hdmi.c @@ -293,6 +293,11 @@ int msm_hdmi_modeset_init(struct hdmi *h 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;