dmabuf: Don't crash clients by sending version inappropriate events

We need to make sure the client bound dmabuf with a high enough
version to receive modifier events before sending them or the
client will crash.

Signed-off-by: Derek Foreman <derekf@osg.samsung.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>

diff --git a/libweston/linux-dmabuf.c b/libweston/linux-dmabuf.c
index ac219ac36d160c0fe2b1e5d2b8266885f062de5c..d81b63d54b23580223823ab8868956d60525cf11 100644 (file)
--- a/libweston/linux-dmabuf.c
+++ b/libweston/linux-dmabuf.c
@@ -483,6 +483,8 @@ bind_linux_dmabuf(struct wl_client *client,
        wl_resource_set_implementation(resource, &linux_dmabuf_implementation,
                                       compositor, NULL);
 
+       if (version < ZWP_LINUX_DMABUF_V1_MODIFIER_SINCE_VERSION)
+               return;
        /*
         * Use EGL_EXT_image_dma_buf_import_modifiers to query and advertise
         * format/modifier codes.