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: 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

---

drivers/gpu/drm/msm/dsi/dsi.c | 6 ++++++ 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/msm/dsi/dsi.c b/drivers/gpu/drm/msm/dsi/dsi.c index 39bbabb5daf6..8a95c744972a 100644 --- a/drivers/gpu/drm/msm/dsi/dsi.c +++ b/drivers/gpu/drm/msm/dsi/dsi.c @@ -218,6 +218,12 @@ int msm_dsi_modeset_init(struct msm_dsi *msm_dsi, struct drm_device *dev, 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);