From: Johan Hovold <johan+linaro@xxxxxxxxxx> commit 2e786eb2f9cebb07e317226b60054df510b60c65 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: a689554ba6ed ("drm/msm: Initial add DSI connector support") Cc: stable@xxxxxxxxxxxxxxx # 4.1 Signed-off-by: Johan Hovold <johan+linaro@xxxxxxxxxx> Tested-by: Kuogee Hsieh <quic_khsieh@xxxxxxxxxxx> Reviewed-by: Kuogee Hsieh <quic_khsieh@xxxxxxxxxxx> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx> Patchwork: https://patchwork.freedesktop.org/patch/502668/ Link: https://lore.kernel.org/r/20220913085320.8577-4-johan+linaro@xxxxxxxxxx Signed-off-by: Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/msm/dsi/dsi.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/drivers/gpu/drm/msm/dsi/dsi.c +++ b/drivers/gpu/drm/msm/dsi/dsi.c @@ -212,6 +212,12 @@ int msm_dsi_modeset_init(struct msm_dsi return -EINVAL; priv = dev->dev_private; + + if (priv->num_bridges == ARRAY_SIZE(priv->bridges)) { + DRM_DEV_ERROR(dev->dev, "too many bridges\n"); + return -ENOSPC; + } + msm_dsi->dev = dev; ret = msm_dsi_host_modeset_init(msm_dsi->host, dev);