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wayland/xdg-shell: Move popup role assignment behind checks

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If we returned early in one of the checks but already assigned the
surface role, we'd later run into a double-free and crash. Just do
the checks at the beginning.

Also add a missing return statement that was left out in commit
88ff196fe3 and tighten the parent surface check.

https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1415
This commit is contained in:
Robert Mader 2020-08-26 22:55:40 +02:00
parent 2945a18cd1
commit 1c4a518cd3
1 changed files with 18 additions and 13 deletions
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31
src/wayland/meta-wayland-xdg-shell.c
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@ -171,6 +171,10 @@ static MetaWaylandSurface *
surface_from_xdg_surface_resource (struct wl_resource *resource)
{
MetaWaylandSurfaceRole *surface_role = wl_resource_get_user_data (resource);
if (!META_IS_WAYLAND_SURFACE_ROLE (surface_role))
return NULL;
return meta_wayland_surface_role_get_surface (surface_role);
}
@ -1851,18 +1855,6 @@ xdg_surface_constructor_get_popup (struct wl_client *client,
MetaWaylandXdgPopup *xdg_popup;
MetaWaylandXdgSurface *xdg_surface;
if (!meta_wayland_surface_assign_role (surface,
META_TYPE_WAYLAND_XDG_POPUP,
"shell-client", shell_client,
"xdg-surface-resource", xdg_surface_resource,
NULL))
{
wl_resource_post_error (xdg_wm_base_resource, XDG_WM_BASE_ERROR_ROLE,
"wl_surface@%d already has a different role",
wl_resource_get_id (surface->resource));
return;
}
if (!parent_resource)
{
wl_resource_post_error (xdg_wm_base_resource,
@ -1870,10 +1862,11 @@ xdg_surface_constructor_get_popup (struct wl_client *client,
"Parent surface is null but Mutter does not yet "
"support specifying parent surfaces via other "
"protocols");
return;
}
parent_surface = surface_from_xdg_surface_resource (parent_resource);
if (!META_IS_WAYLAND_XDG_SURFACE (parent_surface->role))
if (!parent_surface || !META_IS_WAYLAND_XDG_SURFACE (parent_surface->role))
{
wl_resource_post_error (xdg_wm_base_resource,
XDG_WM_BASE_ERROR_INVALID_POPUP_PARENT,
@ -1890,6 +1883,18 @@ xdg_surface_constructor_get_popup (struct wl_client *client,
return;
}
if (!meta_wayland_surface_assign_role (surface,
META_TYPE_WAYLAND_XDG_POPUP,
"shell-client", shell_client,
"xdg-surface-resource", xdg_surface_resource,
NULL))
{
wl_resource_post_error (xdg_wm_base_resource, XDG_WM_BASE_ERROR_ROLE,
"wl_surface@%d already has a different role",
wl_resource_get_id (surface->resource));
return;
}
xdg_popup = META_WAYLAND_XDG_POPUP (surface->role);
xdg_popup->resource = wl_resource_create (client,