From 6ed36cd6e36e9bd15ae4ca39f5b8163c4740c484 Mon Sep 17 00:00:00 2001 From: Olivier Fourdan Date: Tue, 25 Sep 2018 13:50:09 +0200 Subject: [PATCH] wayland: No xdg-output events without a logical monitor To avoid a known race condition in the wl_output protocol documented in https://phabricator.freedesktop.org/T7722, mutter delays the `wl_output` destruction but nullify the `logical_monitor` associated with the `wl_output` and the binding routine `bind_output()` makes sure not to send wl_output events if the `logical_monitor` is `NULL` (see commit 1923db97). The binding routine for `xdg_output` however does not check for such a condition, hence if the output configuration changes while a client is binding to xdg-output (typically Xwayland at startup), mutter would crash while trying to access the `logical_monitor` which was nullified by the change in configuration. Just like `bind_output()` does for wl_output, do not send xdg-output events if there is no `logical_monitor` yet. Closes: https://gitlab.gnome.org/GNOME/mutter/issues/194 (cherry picked from commit 68ec9ac017157def9b7c25dd8141dc0e93d9f918) --- src/wayland/meta-wayland-outputs.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/src/wayland/meta-wayland-outputs.c b/src/wayland/meta-wayland-outputs.c index bc67b90be..1f99a163d 100644 --- a/src/wayland/meta-wayland-outputs.c +++ b/src/wayland/meta-wayland-outputs.c @@ -592,6 +592,9 @@ meta_xdg_output_manager_get_xdg_output (struct wl_client *client, wayland_output->xdg_output_resources = g_list_prepend (wayland_output->xdg_output_resources, xdg_output_resource); + if (!wayland_output->logical_monitor) + return; + send_xdg_output_events (xdg_output_resource, wayland_output, wayland_output->logical_monitor, -- 2.19.0