1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_encoder.c b/drivers/gpu/drm/drm_encoder.c
index 59e0ebe733f8..273e1c59c54a 100644
--- a/drivers/gpu/drm/drm_encoder.c
+++ b/drivers/gpu/drm/drm_encoder.c
@@ -110,6 +110,10 @@ int drm_encoder_init(struct drm_device *dev,
 {
         int ret;
 
+        /* encoder index is used with 32bit bitmasks */
+        if (WARN_ON(dev->mode_config.num_encoder >= 32))
+                return -EINVAL;
+
         ret = drm_mode_object_add(dev, &encoder->base, DRM_MODE_OBJECT_ENCODER);
         if (ret)
                 return ret;