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-rw-r--r--drivers/gpu/drm/drm_stub.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_stub.c b/drivers/gpu/drm/drm_stub.c
index 1b3e0ff57b4..ef878615c49 100644
--- a/drivers/gpu/drm/drm_stub.c
+++ b/drivers/gpu/drm/drm_stub.c
@@ -185,6 +185,9 @@ int drm_dropmaster_ioctl(struct drm_device *dev, void *data,
if (!file_priv->is_master)
return -EINVAL;
+ if (!file_priv->minor->master)
+ return -EINVAL;
+
mutex_lock(&dev->struct_mutex);
drm_master_put(&file_priv->minor->master);
file_priv->is_master = 0;