From: Johan Hovold johan+linaro@kernel.org
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@vger.kernel.org # 4.1 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/502668/ Link: https://lore.kernel.org/r/20220913085320.8577-4-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/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);