Send an invalid_parent error when the client tries to create a popup
with a paren that is neither a xdg_surface nor a xdg_popup.

Signed-off-by: Jonas Ådahl <[email protected]>
---
 desktop-shell/shell.c  | 11 ++++++++++-
 protocol/xdg-shell.xml |  3 ++-
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/desktop-shell/shell.c b/desktop-shell/shell.c
index 6697222..57f7335 100644
--- a/desktop-shell/shell.c
+++ b/desktop-shell/shell.c
@@ -4092,12 +4092,21 @@ create_xdg_popup(struct shell_client *owner, void 
*shell,
                 uint32_t serial,
                 int32_t x, int32_t y)
 {
-       struct shell_surface *shsurf;
+       struct shell_surface *shsurf, *parent_shsurf;
 
        /* Verify that we are creating the top most popup when mapping,
         * as its not until then we know whether it was mapped as most
         * top level or not. */
 
+       parent_shsurf = get_shell_surface(parent);
+       if (!shell_surface_is_xdg_popup(parent_shsurf) &&
+           !shell_surface_is_xdg_surface(parent_shsurf)) {
+               wl_resource_post_error(owner->resource,
+                                      XDG_POPUP_ERROR_INVALID_PARENT,
+                                      "xdg_popup parent was invalid");
+               return NULL;
+       }
+
        shsurf = create_common_surface(owner, shell, surface, client);
        if (!shsurf)
                return NULL;
diff --git a/protocol/xdg-shell.xml b/protocol/xdg-shell.xml
index 360179d..14165dc 100644
--- a/protocol/xdg-shell.xml
+++ b/protocol/xdg-shell.xml
@@ -402,7 +402,8 @@
       <description summary="xdg_popup error values">
        These errors can be emitted in response to xdg_popup requests.
       </description>
-      <entry name="not_the_topmost_popup" value="0" summary="The client tried 
to destroy a non-toplevel popup"/>
+      <entry name="not_the_topmost_popup" value="0" summary="The client tried 
to map or destroy a non-toplevel popup"/>
+      <entry name="invalid_parent" value="1" summary="The client specified an 
invalid parent surface"/>
     </enum>
 
     <request name="destroy" type="destructor">
-- 
2.1.0

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